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 of toe-in and NOT toe-out. All prior years of
this chassis should use the specs above.
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 minus .25 degrees and TOE-IN at 0 degrees or slightly plus up to .06
degrees.
After the wheel alignment is completed take the vehicle for a test drive. Note any wandering,
drifting or pulling that would indicate that the alignment is still out-of-spec.
Main Body Page 17 of 38 Total Pages
