THOR Class C Series - Tires and Wheels

TIRES AND WHEELS
37THOR MOTOR COACH | MADE TO FIT
3
Tires and Wheels
Uniform Tire Quality Grade Standards (UTQGS)
is section of your owner’s manual contains tire safety information as required by the
U.S. Department of Transportation (DOT) National Highway Transportation Safety
Administration’s (NHTSA) 49 CFR 575.6 Uniform Tire Quality Grade Standards (UTQGS).
e UTQGS is intended to aid consumers in making informed choices in the purchase of
passenger car tires.
Tire ratings are located on the sidewall of passenger tires sold in the United States (except
deep tread, winter-type snow tires; space-saver or temporary use spares; tires with normal rim
diameters of 12 inches or less; or limited production tires).
e UTQGS rates tires by treadwear, traction performance, and temperature resistance.
Treadwear
e treadwear grade is a comparative rating based on the wear rate of the tire when tested
under controlled conditions on a specied government test course. For example, a tire graded
150 would under one and a half (1-1/2) times as well on the government course as a tire
graded 100. e relative performance of tires depends upon the actual conditions of their
use, however, and may depart signicantly from the norm due to variations in driving habits,
service practices and dierences in road characteristics and climate.
Traction – AA, A, B, and C
NOTE: Always pay close attention to the
condition of your motorhome's tires
The traction grade assigned to a tire is based on braking (straight ahead) traction
tests and does not include cornering (turning) traction.
WARNING
e traction grades from highest to lowest are AA, A, B, and C, and they represent the tire’s ability
to stop on wet pavement as measured under controlled conditions on specied government test
surfaces of asphalt and concrete. A tire marked C may have poor traction performance.