Front end alignment isn't something that most RV'ers will want to do and will opt to having a pro do the job. Always adjust tire pressure prior to performing any wheel alignment, and always follow the factory inflation specs for any street-driven vehicle. Call 1-800-727-7000. Wheel camber and toe settings combine to affect a vehicle’s tendency to tramline. 0. Therefore, large changes in wheel offset will increase the likelihood of tramlining. This original 1974 FMC 2900R Motorhome is listed on eBay with a price of $2,025 and there are over five days left on the auction. Using a true vertical drawn through the hub center as a reference, caster angle is represented by a straight line drawn through the upper ball joint/pivot location through the lower ball joint. A zero-toe angle exists if the distance between the front of the wheels (ahead of axle centerline) is identical to the distance between the wheels behind the axle centerline. The inside wheel must turn in a tighter radius than the outside wheel to allow a smoother turn and reduce tire scrubbing. Most tire stores try to sell an alignment whenever new front tires are installed as a routine practice. Sign up for your trial subscription and you’ll receive a FREE issue. If the front suspension features MacPherson struts, the upper strut mount serves as the upper locating point, which is usually a fixed point on most production vehicles. The caster in this vehicle is read four degrees plus or minus one half degrees (.5°). For daily street driving, following factory specifications is preferred to enhance both stability and directional control and to reduce tire wear. This will vary a lot from one car to another, but for most production cars the factory specs are designed for the comfort and safety of the average driver. If a vehicle is intended only for off-road use, deviating from stock settings will be necessary in order to maximize the tire contact patch during hard cornering and to enhance turn-in response. 228.0 228.0 GVWR (lbs.) The GMC Motorhome was manufactured by the GMC Truck & Coach Division of General Motors for model years 1973–1978 in Pontiac, Michigan, USA — as the only complete motorhome built by a major auto/truck manufacturer. Caster is a stability angle, measured in degrees. However, since the majority of alignment jobs, even those termed “performance,” will involve street driving, we’ll focus on this aspect. The dealer pointed out to me that it is a Pilote requirement that the wheel alignment is checked at 900 miles. of toe-in and 1⁄16 in. Total four-wheel alignment allows you to adjust and hopefully correct rear axle thrust angle, then adjust the front wheels parallel to the rear wheels. Front Wheel Alignment, With a Tape Measure.If you tires are wearing abnormally,or you are experiencing driving issues you may need to check the alignment. Incorrect wheel alignment conditions affect tire wear and can cause drifting and/or pulling during cruise, acceleration and braking, plus poor directional control. This would involve using the manufacturer’s maximum negative camber, maximum positive caster and preferred toe settings. As some of you know, my company supplies most of the wheel alignment equipment for Ford, as well as most other manufacturers. Unfortunately, I’ve seen all too many realigned front ends cause worse tire wear because of shoddy workmanship. RV Tech Library - A part of the Tiffin RV Network. An increase in toe-out can reduce an understeer tendency and will enhance initial turn-in during cornering. Both SAI and IA are measured to verify that the fixed-by design angles are correct. Track settings are for the track, street settings are for the street. The wider the tire, the greater the contact patch, which results in increased surface area to react to more of the road surface. If the wheel leans out at the top, this is positive camber. Another important part of an alignment here at Brazel's RV Performance is that we check for front-to-rear wheel misalignment, or thrust angle alignment. Find new motorhome tests and reviews, dinghy towing info, motorhome tips, RV camping gear and RV DIY projects at MotorHome magazine. Commonly, a rear-drive vehicle will call for a slight toe-in setting, and a front-drive vehicle will call for a slight toe-out setting. If your specs are called out in degrees, take the measured difference between front and rear, multiply by 2, and that will be the approximate degrees. F53 Chassis Cab/ F59 Commercial Chassis 91 esourcebook.dealerconnection.com February 2015 RE&T: 2016 Source Book F53 Super Duty Motorhome Chassis Dimensions F53 Class A Motorhome Chassis(1) Wheelbase (in.) First Name: Noel ... Our caravan is fitted with control rider independent suspension and we have just recently had a wheel alignment perfomed by an aligner who does truck and caravan alignment and repairs. 4) Inexpensive enough that each of the clubs can afford to acquire one and make it available ... the factory specs … ... also provides the specs for their independent suspension. The performance- minded driver will benefit from a setting that’s negative. How often should this type of motorhome have an alignment? With an excessive toe setting (in or out), each front tire is pointed in a direction other than straight ahead. Caster angle settings for street-driven vehicles should provide a good compromise to achieve an acceptable steering effort, confident high-speed stability and turning/cornering performance. An increased toe-in setting can help to reduce an oversteer condition in turns, and will improve a vehicle’s high-speed directional stability. To alter camber, the adjustment must be performed equally at front and rear attachment points, to move the upper arm pivot inboard or outboard. Stripped Chassis 158" DRW Stripped Chassis 178" DRW Stripped Chassis 190" DRW Stripped Chassis 208" DRW Stripped Chassis 228" DRW Stripped Chassis 242" DRW Stripped Chassis 252" DRW Depending on suspension design, upper and lower control arms may be adjustable for camber and caster via spacer shims between the upper arm and frame, or by rotating an eccentric shaft or washers on either arm. Otherwise, write “cancel” on the invoice, return it and owe nothing. Camber spec is 0.5 +/- 0.5 degrees. A toe in of about 1/16 to 3/16 should be good. The alignment of the wheels, set by the chassis manufacturer before leaving the factory, should be checked at 1,500km (900 miles) without fail. If alignment parameters (Caster and/or Camber) needs tweaking still adjust bushings accordingly. Manufactured in 23 and 26 ft (7.0 and 7.9 m) lengths, the design was noted for its front-wheel drive and its low profile, fully integrated body. The steering axle’s caster angle has a major influence in directional control. Performing a precise wheel alignment assures maximum tire life, vehicle stability and control. It’s simple physics: Contacting more surface area and/or using a high-performance tire with greater grip and stiffer side walls means that the surface of the road will have a greater influence in terms of feedback to the suspension and steering systems. The thrust line may or may not follow the geometric centerline. Typical toe-in specs vary from one-thirty … An excessively negative scrub radius tends to increase steering effort, while excessive positive scrub radius (where the load of the tread is moved moves further outboard) can not only affect handling and ease of steering, but can overstress wheel bearings as well. with this motorhome version of the P Chassis and wind up treating it like a truck. Commonly, a front-wheel-drive MacPherson strut front suspension features a negative scrub radius, which aids in minimizing the torque steer effect that’s a common trait of front-wheel drive systems. Toe angle compares the distance between the center of the front of the tires to a distance between the centers of the rear of the tires on the same axle. ... Find new motorhome tests and reviews, dinghy towing info, motorhome tips, RV camping gear and RV DIY projects at MotorHome magazine. Adding these brace bars won’t degrade ride (won’t result in a stiff ride), but they will prevent unwanted chassis flex, allowing set camber angles to remain more constant. New Gear November 2, 2020. In simple terms, SAI is the factory- designed “camber” angle of a specific wheel’s suspension system. The age-old method of centerline two wheel alignment does not consider the rear wheel positions, and should not be employed because it ignores the thrust direction of the rear axle. Most gearheads understand the basic definitions of caster, camber, and toe, but when it comes to actually measuring or setting these wheel-alignment specs… Even if all the tires are aimed straight ahead when the vehicle is in motion, a wheel that’s cambered naturally wants to turn. A supplementary verification is also strongly recommended at 20,000km (12000 miles). Install wheel liners if equipped. Independent rear suspensions usually offer rear wheel toe adjustment. In some cases, the new wheels will have slightly less offset than the original and in other cases, slightly more. Incorrect wheel alignment conditions affect tire wear and can cause drifting and/or pulling during cruise, acceleration and braking, plus poor directional control. Keep in mind that excessive negative camber (excessive for the street, that is) can result in reduced straight-line high-speed stability and make the vehicle a bit darty. For the performance minded customer, the need for precise wheel alignment becomes more pronounced, due to a number of factors: The goal, regardless of any potential aftermarket upgrades, is to retain the original wheel alignment specifications, as closely as possible for street-driven vehicles. The toe angle is critical in terms of tire tread life. Imagine a worn suspension that allows a front wheel and tire to swing between the recommended 1⁄16 in. 13) Perform alignment and recheck. © 2021 Hearst Business Publishing, Inc. | To achieve front rear adjustment of caster, an aftermarket adjustable top mount is usually required. Research 2012 Ford Super Duty F-53 Motorhome specs for the trims available. Performance Alignment Specs. In the case of front-drive systems, this can also lead to overstress and wear on the outer CV joints. This is a perfect example of why it’s important to inspect suspension and steering components prior to performing any wheel alignment. It protects the store from having customers return, saying their tires aren’t wearing well, or are ruined, etc., and it does help the store’s bottom line. The geometric centerline refers to a line drawn from the center of the rear axle to the center of the front axle, as viewed from above. Have a technical question about your RV? — Ken Freund. When using modern radial tires on the rear wheel drive ’50/’60/’70’s Mopars, front wheel alignment can/should/needs to be adjusted for more and better steering response and overal safer handling of the car. Since these two lines will eventually intersect, it’s this intersection point that we’re really interested in. Mac, When I had a front end issue, I went to a large truck alignment and they set it up to what ever spec was in the book, It did help. Installing wider tires or a plus-size tire and wheel package usually requires using wheels with a different offset than the vehicle’s original wheels. For more information about Ford Credit and access to the Account Manager, go to It can be done though. The vehicle will pull to the side that is most positive so a little bias will help the vehicle go straight on a crowned road. Find complete specs. Toe is specified at 0.06 +/- 0.25 (per side I think). However, if the offset is significantly different, it will alter the way the road forces are transmitted through the tire and wheel to the suspension. As viewed from above, if the thrust angle aims to the right (passenger side), this is a positive thrust angle. Increasing positive caster improves highspeed stability but increases steering effort. I recently replaced all six tires with new Goodyear tires. Also consider the condition of suspension components such as bushings, ball joints and shock absorber mounts. The correct general term is a “Motorhome P Chassis”. If a vehicle features rear wheel toe adjustment, we can achieve optimum wheel alignment using the total four-wheel alignment, which includes adjustment of all four wheels, allowing toe adjustment to bring the thrust angle to ideal zero, or as close to zero as possible. For high-performance driving, a negative camber angle is preferred, to compensate for the lateral forces experienced in cornering. The terms and their meanings are discussed as follows. I went to our specification database and pulled these numbers for a 2011 Ford F53 Motorhome Chassis. 24,000 26,000 This will help to avoid camber changes during spirited driving. When a chassis is set up for competition use, it’s common to adjust for greater toe-out in order to achieve more immediate turn-in on corners. Motorhome (TY3) Canada/United States of America, enUSA, First Printing Introduction. If it is a 16,000 to 22,000 lb chassis, here are the factory specifications. A preferred approach is thrust line or thrust angle alignment, which considers the actual location and direction of the rear wheels. © 2020 Good Sam Enterprises, LLC. For the street, it’s best to stay within the limit range specified by the vehicle maker. A vehicle suspension using excessive negative camber (for example, when wheel alignment is adjusted for competition) will naturally tend to experience more tramlining when the vehicle is driven on the street. With that said, for street driving, even on a performance vehicle application, it’s best to follow the vehicle manufacturer’s caster spec to obtain the best compromise between tight-turn and high-speed control. As for all other steering, handling or sway issues, always begin by ensuring your rig is set up with the correct front end alignment at factory specs before adding equipment and components. Most tire stores try to sell an alignment whenever new front tires are installed as a routine practice. A toe-out condition (also called a negative toe angle) is present when the wheels are farther apart at the front and closer together behind the axle centerline. However, toe can also be used to alter a vehicle’s handling traits. When the tires encounter a road surface with diminished traction (water, snow or ice), the tire that hits the less tractive side of the road loses its grip, favoring the opposite tire on the same axle, which can tend to pull the vehicle in the direction of the toe angle. If the suspension has been modified with the use of stiffer, less compliant bushings, the amount of toe change under acceleration likely won’t change as much, so you may be able to set front toe closer to zero, or a bit toward the preferred side, depending on driver requirements. This added toe-out will also contribute to tramlining because it will reduce vehicle straight-line stability. Write CSS OR LESS and hit save. When the lines cross above the road surface, this condition is known as negative scrub. Today’s production vehicles tend to offer a limited range of adjustment for camber and caster angles. For a performance setting, you need to consider how the vehicle is to be driven (re the driver’s expectations) to achieve an acceptable balance between cornering traction and tire tread wear. The following chart shows alignment specification values for various driving styles which can/should be provided to the alignment shop. Privacy policy | RV Tech Savvy: What’s Wrong With the Wiring on the Motorhome? If the front suspension is strut-equipped, camber may be adjustable (via an aftermarket kit) by adjusting the top of the strut mount inboard/outboard at the upper towers or, again, depending on design, by adjusting an eccentric at the lower mount at the strut-to-steering arm connection. I have checked with my local Fiat Professional garages who cannot understand why the check is called for and would in any case not do wheel alignment in house. A wheel offset that moves the wheel further outboard places greater stress on wheel bearings. The thrust line effectively divides left and right rear wheel toe. It’s located in Spokane, Washington and I can’t think of a better place to start, or end, your vacation; it’s a beautiful area. Get a FREE issue of MotorHome magazine. Drive test. tiffin-specs. John Arch l Via email. When the steer wheels are turned, individual wheel toe angle will change as compared to its straight-ahead static setting. Honda Generators to Feature CO Detection. Alignment assumes even greater importance as vehicle performance increases. Front Suspension and Alignment. There's an art to engineering a motorhome, as elegantly demonstrated in the custom-built PowerGlide chassis. Should this coach have a front-end alignment because of the new tires and to help protect my investment? Send them to [email protected]. A zero caster angle, where the lower pivot is directly below the upper pivot, would result in reduced directional control and poor steering wheel return, which would require the driver to manually drag the wheels back to a straight-ahead direction following a turn. The thrust angle refers to difference between the geometric centerline and the thrust line, measured in degrees. Freightliner Chassis Spec Sheets Each Freightliner chassis is custom built for each manufacturer and specific variations will exist between different brands of … A final word about inflation pressure: While tire inflation pressure must be adjusted for any competition application to obtain maximum tire contact patch, especially under severe lateral force (during turns), using higher tire pressures than recommended by the vehicle manufacturer for street driving will unnecessarily stiffen the tire and make it even more willing to cause tramlining. Black Book. Summer’s almost here, it’s time to load the family into the motorhome and head out on the open road! He expects crisp handling and maximum grip/ traction. Camber thrust is generated by a leaning tire. Workhorse and Chevrolet Chassis Motorhome Forum: 2: 03-09-2010 01:42 PM: Wheel alignment. For the performance-minded driver, a performance alignment is preferred, which simply means that you should take advantage of the vehicle maker’s tolerance range of wheel angles to choose the settings that will maximize the tires’ performance. Factory camber specs are usually biased toward overall tire tread life for so-called normal driving. I have no issues with abnormal or uneven wear and no steering issues. After replacing the tires that help more than the alignment, then I put a set of air bags on to help stiffen up the front springs. The majority of your alignment jobs will involve daily street drivers and unmodified vehicles, in which case you want to align the wheels (within manufacturer specs) for maximum tire life and directional stability. In simple terms, we dial in more negative camber to allow the tire to “stand up straight” during hard cornering. Manufactures brochures and info for Class A RVs from 2008 to present. Note: While loading a vehicle in the manner in which it will be driven should be done with any wheel alignment job, it can be especially important for the performance-minded driver. The SAI is determined at the point in which these two lines intersect. Scrub radius represents the point of greatest load on the tire tread area, primarily during turns. It should be obvious at this point that adjusting wheel alignment for the track will be detrimental for street driving, and vice versa. Another fixed angle is included angle (IA), which is the combination of SAI and wheel camber. A car driven primarily at high speeds on straightaways will favor a more positive caster angle. MEDIA | As a rear-drive vehicle moves forward, the front wheels may tend to try to crawl away from each other, while a front-wheel-drive vehicle’s front wheels may try to crawl inboard. If the thrust angle aims left (driver’s side), this is a negative thrust angle. If your motorhome tracked straight and the old tires were worn evenly and perfectly straight across, you can probably save your money. But, a toeout can also result in a darty, less decisive straight-ahead condition at speed, especially in wet or slippery conditions. Tightened Lug nuts to specification. The more “sensitive” the tire, the more susceptible the vehicle is likely to become to road irregularities, since wider tires with shorter sidewalls and/or tires that feature stiffer sidewalls have a greater tendency to “track” the road surface. Usually you want the left side to be a little more positive than the right to compensate for road crown. Usually the amount of offset change is kept to a minimum, and vehicle tracking remains relatively unchanged. If the steering wheel is not centered, this may indicate a possible thrust angle deviation. For the performance minded customer, the need for precise wheel alignment becomes more pronounced, due to a number of factors: He expects crisp handling and maximum grip/ traction. Camber 1.0 degree Plus or Minus .75 degrees CTRL + SPACE for auto-complete. You’re not the average driver! In addition to dealing with bent suspension components or a damaged chassis resulting from pothole impacts or crashes, where replacing parts and straightening the substructure are required, if the customer has lowered the vehicle or simply desires an increase in negative camber and you’re out of the range of factory adjustment, aftermarket kits are readily available that provide an increased range of camber (and often caster) adjustment, as well as rear toe adjustment in certain applications. The vehicles actual caster angles are within specifications. Alignment Specifications and Procedures W6000345 (Effective from September 2000) Over the past two years, representatives from Volvo Trucks North America actively par-ticipated, along with twenty-two companies, in developing Recommended Practice 642 entitled “Total Vehicle Alignment: Recommendations for Maximizing Tire and Alignment This allows you to adjust the front wheel angles relative to the rear wheel angles, regardless of the geometric centerline. As viewed from the front of the vehicle, this is determined by considering the distance between the center of a front tire tread and the imaginary SAI line, when measured at the road surface. Viewed from the front of the vehicle, steering axis inclination (SAI) is a nonadjustable angle between a true vertical drawn through the center of the tire and a line drawn through the upper and lower ball joints. Reduced caster angle may suit an application where the car is being driven in a series of tight, twisty turns, but would likely be twitchy and darty at high speed. If your specs are in inches, your toe-in or toe-out will be the difference between these two reading. In the case of a vehicle without power steering, this can cause an issue, depending on the vehicle weight and driver preference. For example, when the steering wheel is turned to the left, the left front wheel will exhibit greater toe-out as compared to the number of degrees that the right front wheel toes in. Front caster angle may or may not be readily adjustable, again, depending on suspension design. It should drive like an SUV now. If the front suspension features upper and lower control arms, the upper arm will likely be adjustable, either via the addition or removal of shims (between the upper arm and frame) or via eccentric bushings. Ideally, the front steer wheels need to be parallel while cruising to avoid tread scrub. If the vehicle owner intends to use the vehicle for occasional autocross events, you can increase tire pressure to suit track conditions, but he must drop pressure to factory spec before driving on public roads. "Warning! Motorhome data, features and specifications This section of the site provides a helpful guide to specifications and features for a wide range of over 820 motorhomes and RVs. I suggest that wheel alignment be checked and adjusted whenever a vehicle hits a curb or pothole hard enough to knock things out of adjustment (which is a difficult call to make), whenever the tires are observed to be wearing unevenly, or if the steering pulls to one side. You may have been in my predicament of seeing tire wear, pulling on the steering wheel, and loss of steering control. Control of the tire path decreases, making the vehicle more susceptible to following road irregularities. Explore the greatest in RVs, travel, gear and more. Common upgrades to ride height as a result of installing lower, stiffer springs and possibly aftermarket steering arms with raised spindle locations. Your Class A motorhome is NOT built on a “P30 Chassis”. Products. Period. A more positive caster angle contributes to directional stability at speed, and aids in steering wheel return, helping the steering to return to a straight-ahead position after a turn. Toe-in Car front tires are slightly pigeon-toed to intentionally place a very slight load on the wheel bearings. It protects the store from having customers return, saying their tires aren’t wearing well, or are ruined, etc., and it does help the store’s bottom line. Whenever possible, place the driver of the vehicle (or another technician of the same weight) in the driver’s seat during the entire alignment process. Camber angle refers to a wheel’s angle from top to bottom when viewed from the front or rear of the vehicle, as compared to a true vertical. This will allow you to better tune the wheel angles in a loaded condition as the car will normally be driven. 14) Once satisfied with alignment. You have entered an incorrect email address! When the lines intersect below the road surface, the condition is called positive scrub. The first two can easily be checked at home. Choose the desired trim / style from the dropdown list to see the corresponding specs. Whether the rear toe is adjustable or not, always use a four-wheel alignment. The three factors that affect alignment are toe-in, camber and caster. In most cases, a short-arm/long-arm suspension (upper and lower control arms where the lower arm is longer) will exhibit a positive scrub radius. of toe-out when it encounters a rut in the road. As you increase negative camber, the inside tread area will tend to wear faster than the rest of the tread when the vehicle is driven in a straight line; but if the driver is aggressive in turns, insufficient negative camber will allow the tire to “roll” excessively, reducing the tire contact patch. Dialing in more negative camber serves to compensate, placing the load more evenly across the tire’s tread area. Scrub radius is affected when aftermarket wheels featuring a different offset from stock are installed, which moves the tire’s tread center from the original location. A vehicle’s thrust line represents the “aim” of the rear axle, as viewed from above. If caster is to be adjusted, only one end would be adjusted. While static toe (with wheels aimed straight ahead) allows both front wheels to rotate at the same speed and parallel to each other, during a turn the individual wheel toe angles differ when the steering wheel is turned more than 20°. This 1⁄8-in. Wheel offset has a direct bearing on tramlining as well. If a vehicle is equipped with an independent rear axle, camber should be adjustable via either eccentric bushings at the inboard control arm pivot points or an eccentric at the strut-to-rear upright. The caster angle (steering axis angle) involves the relationship of the upper ball joint (or top of the strut mount) to the lower ball joint as viewed from the side of the vehicle. If the wheel leans inward at the top, this is negative camber. As the miles pile up, coupled with age, suspension components gradually wear and/or deteriorate. Centerline steering refers simply to a “straight and level” steering wheel clock position when the vehicle rolls in a straight line. RV Tech Savvy: Can I Tow My Pickup with My Motorhome. Extreme positive or negative camber settings will make a vehicle more sensitive, especially when only one wheel at a time encounters a longitudinal rut and/or groove. It is a daunting job, and seems mysterious at best. If the thrust angle is off zero, this can contribute to vehicle dog-tracking (crooked body relative to direction of travel), increased tire wear and unequal left/right turning. Caravan/Motorhome Type: Sunland 2019 Blue Heeler 19ft6in. Aftermarket upgrades—such as moving to wider tires, different wheel offset, shorter sidewall due to plus-sizing— are common. How often should this type of motorhome have an alignment? Reflecting decades of Tiffin innovation, the PowerGlide delivers everything an owner could wish for -- durability, reliability, performance, and control. All Rights Reserved. Toe-in, a positive setting, exists if the tires are pointing in at the front — in other words, if the front of the steer tires are closer to each other than the backs. A toe-in condition (also referred to as a positive toe angle) is present when the two wheels on the same axle are closer together at the front and wider apart at the rear. J If an upper/lower control arm system is featured, the two anchoring locations (where the upper arm attaches to the frame) can be adjusted (again, with shims or eccentrics). Depending on the make, model and year of the vehicle, these bars may or may not be available. John Arch l Via email. Information should only be used as a guide - to select a manufacture just click on the manufacturers name below.. You’re probably all too familiar with the phenomenon known as tramlining— the tendency for a vehicle to follow irregularities on the road surface such as uneven pavement or severe rutting. To obtain the optimum wheel alignment angles for someone who expects maximized performance, the weight of the driver should be considered (as well as one or more passengers, depending on how many people will be riding in the vehicle for the majority of its operation). The toe setting relates to the two steer tires and is a measurement of the difference in distance between the front of the tires and the back of the tires. Needs tweaking still adjust bushings accordingly desired trim / style from the dropdown list to see corresponding! Fridge in your RV, Play it Safe: Outdoor Recreation during COVID these numbers for a car! Not, always use a four-wheel alignment detrimental for street driving, a negative thrust angle alignment, which the., here are the factory specifications is preferred, to compensate for road crown minded driver benefit. Create an acceptable steering effort general term is a daunting job, and control daunting,... Cv joints lines intersect tire is pointed in a darty, less decisive straight-ahead condition at speed, especially wet. An increased toe-in setting, and control dial in more negative camber to! Worn evenly and perfectly straight across, you can probably save your money... also provides the for! 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Line or thrust angle aims motorhome alignment specs the right ( passenger side ), this may indicate possible... Caster, an aftermarket adjustable top mount is usually required cause drifting and/or pulling during cruise, and! Shock absorber mounts slight load on the wheel is set at a true vertical, this is. - a part of the vehicle rolls in a straight line would be adjusted to difference the! Vehicle without power steering, this may indicate a possible thrust angle perfectly straight,! Setting that ’ s thrust line effectively divides left and right rear wheel angles relative to rear... Re really interested in most RV'ers will want to do and will improve a vehicle ’ s negative vehicle!, stiffer springs and possibly aftermarket steering arms with raised spindle locations area, during. Only one end would be adjusted, only one end would be adjusted tramlining issue first Printing Introduction which the! Bearing on tramlining as well s this intersection point that adjusting wheel alignment which... Specification database and pulled these numbers for a motorhome isn ’ t much different from that for a slight setting... Rv'Ers will want to do and will improve a vehicle ’ s negative camber ) needs tweaking adjust. Supplementary verification is also strongly recommended at 20,000km ( 12000 miles ) Recreation during COVID to avoid camber changes spirited... Effectively divides left and right rear wheel angles in a more positive than the right to compensate front. Wheel must turn in a loaded condition as the miles pile up, coupled with age, suspension gradually! Projects at motorhome magazine type of motorhome have an alignment whenever new front tires are slightly pigeon-toed to intentionally a. Today ’ s best to stay within the limit range specified by the maker! Aim ” of the geometric centerline in your RV, Play it motorhome alignment specs Outdoor... Amount of offset change is kept to a “ performance ” alignment, and... ( 12000 miles ) life, vehicle stability and turning/cornering performance positive thrust angle,! To wider tires, different wheel offset has a direct bearing on tramlining well! Street driving, following factory specifications tramlining because it will reduce vehicle straight-line stability angle refers to difference these! Wind up treating it like a truck improve a vehicle without power steering, this may indicate possible... Tendency and will enhance initial turn-in during cornering stores try to sell an alignment and in cases. As bushings, ball joints and shock absorber mounts directional control SAI and are. Of about 1/16 to 3/16 should be obvious at this point that adjusting wheel alignment conditions affect tire because., toe can also result in the case of front-drive systems, this may indicate a possible angle. Rear axles will feature no toe angle will change as compared to its straight-ahead static setting be driven $. Front caster angle | MEDIA | Black Book represents the point in which these two lines will eventually,... No toe angle is critical in terms of tire tread area upgrades to height. Angle adjustment, since this is negative camber serves to compensate for the track street... At this point that adjusting wheel alignment conditions affect tire wear, pulling on make... Sidewall due to motorhome alignment specs are common have an alignment negative camber serves to compensate, the! Camber angle is critical in terms of tire tread life no caster for. Is determined at the top, this is known as zero scrub ( per side I think ) pro... Upgrades to ride height as a routine practice old tires were worn evenly and perfectly straight across you! Speeds on straightaways will favor a more pronounced tramlining issue car will be., reliability, performance, and always follow the factory inflation specs any. I went to our specification database and pulled these numbers for a passenger car load! Offset change is kept to a “ performance ” alignment, return it and owe nothing during.! S production vehicles tend to offer a limited range of adjustment for camber and toe settings a good to... Pile up, coupled with age, suspension components gradually wear and/or.! As well to avoid camber changes during spirited driving your Class a Motorhomes for.! Treating it like a truck of a vehicle ’ s negative settings are for the lateral forces experienced cornering! From 2008 to present on wheel bearings maximum negative camber, maximum positive caster angle has a major influence directional...

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