Treadwear, Department of transportation uniform, Tire quality grades – Ram Trucks 2015 ProMaster City - Owner Manual User Manual

Page 395

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DEPARTMENT OF TRANSPORTATION UNIFORM
TIRE QUALITY GRADES

The following tire grading categories were established by

the National Highway Traffic Safety Administration. The

specific grade rating assigned by the tire’s manufacturer

in each category is shown on the sidewall of the tires on

your vehicle.
All passenger car tires must conform to Federal safety

requirements in addition to these grades.

Treadwear

The Treadwear grade is a comparative rating, based on

the wear rate of the tire when tested under controlled

conditions on a specified government test course. For

example, a tire graded 150 would wear one and one-half

times as well on the government course as a tire

graded 100. The relative performance of tires depends

upon the actual conditions of their use, however, and

IF YOU NEED CONSUMER ASSISTANCE 393