Publication Order Forms; Treadwear; Department Of Transportation Uniform Tire Quality Grades - Fiat 124 SPIDER 2017 Owner's Manual

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Service Manuals
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provide the information that students
and professional technicians need in
diagnosing/troubleshooting, problem
solving, maintaining, servicing, and
repairing FCA US LLC vehicles. A
complete working knowledge of the
vehicle, system, and/or components is
written in straightforward language with
illustrations, diagrams, and charts.
284
Diagnostic Procedure Manuals
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Owner's Manuals
These Owner's Manuals have been
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Included are starting, operating,
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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 vehicle 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 may depart significantly from the
norm due to variations in driving habits,
service practices, and differences in
road characteristics and climate.