Specifications

MODEL CAMBER TOE-IN (IN.)
G10, 20 .5° 3/16”
G30 .2° 3/16”
CLASS A
MOTOR HOME (32 – 52)
.25° ± .25° 0° to .06°
Toe-in was reduced from 5/16 inch in 1985 as part of a GM trend reducing toe-in. If equipped
with radial tires, some tire manufacturers would suggest toe-in specifications of 1/32 inch to
1/8 inch. Basically, you want the tires parallel, if you can't get them exactly on zero, make sure it
is toward that .06 degrees and NOT toe-out.
Alignment
OK, we fixed everything we could fix and everything else is in pretty good shape with weights
balanced and tires and airbags inflated correctly.
Remember: (Appendix D)
CASTER affects your vehicle's low-speed steering, high-speed stability as well as how well your
vehicle drives in a straight line (on-center feel). Too little caster will cause your car to "wander"
and make it feel unstable at high speeds. Too much caster causes hard steering and can also
result in excessive road shock and shimmy. Caster does not affect tire wear.
The CAMBER angle is designed and adjusted per vehicle to keep the tires on the outside of a
curve flat on the ground during a turn. If you have too much positive camber, your tires will
wear on the outside. Too much negative camber will wear them on the inside. If there is too
much of a difference between the camber settings on the front wheels, the vehicle will tend to
pull sharply to one side.
TOE settings affect the handling characteristics of a vehicle in turns. Toe-in introduces
Understeer going into a curve and may make the vehicle feel like the back end is trying to come
around to the front end. Toe-out introduces Oversteer in a curve and makes the vehicle feel like
it is "diving" into the turn too sharply. If the tires are toed-in too much, the tread will be "worn"
off, starting from the outside edges. If they are toed-out, the wear will start from the inside. This
type of wear is called "feathering" and can be felt by running your hands across the tread of the
tire.
Seems we are ready to now tell the alignment guys in our example how we want things set. We
already know the coach is level, not overweight and in good shape because we fixed everything.
For our example we tell them to set CASTER for 6 ¼ degrees, CAMBER at .25 degrees plus or
http://users.sisna.com/cebula/P-Chassis-AlignmentProcess.pdf 21 Version 0.7 –Sep 14, 2005