07 Wheels and tires
Uniform tire quality gradings
07
188
Uniform tire quality gradings
ALL PASSENGER VEHICLE TIRES MUST
CONFORM TO FEDERAL SAFETY
REQUIREMENTS IN ADDITION TO THESE
GRADES
Quality grades can be found, where appli-
cable, on the tire sidewall between the tread
shoulder and maximum section width. For
example:
Treadwear 200 Traction AA
Temperature A
TREADWEAR
The treadwear grade is a comparative rating
based on the wear rate of the tire when tested
under controlled conditions on a specified gov-
ernment test course. For example, a tire gra-
ded 150 would wear one and one half (1 1/2)
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 many depart signifi-
cantly from the norm due to variation in driving
habits, maintenance practices and differences
in road characteristics and climate.
TRACTION
The traction grades, from highest to lowest, are
AA, A, B, and C, as measured under controlled
conditions on specified government test sur-
faces of asphalt and concrete. A tire marked C
may have poor traction performance. The trac-
tion grade assigned to this tire is based on
braking (straight-ahead) traction tests and is
not a measure of cornering (turning) traction.
WARNING
The traction grade assigned to this tire is
based on braking (straight-ahead) traction
tests and is not a measure of cornering
(turning) traction.
TEMPERATURE
The temperature grades are AA (the highest),
A, B, and C, representing the tire's resistance
to the generation of heat and its ability to dis-
sipate heat when tested under controlled con-
ditions on a specified indoor laboratory test
wheel. Sustained high temperature can cause
the material of the tire to degenerate and
reduce tire life, and excessive temperature can
lead to sudden tire failure. The grade C corre-
sponds to a minimum level of performance that
all passenger vehicle tires must meet under the
Federal Motor Safety Standard No. 109.
Grades B and A represent higher levels of per-
formance on the laboratory test wheel than the
minimum required by law.
WARNING
The temperature grade for this tire is estab-
lished for a tire that is properly inflated and
not overloaded. Excessive speed, under-
inflation, or excessive loading, either sepa-
rately or in combination, can cause heat
buildup and tire failure.
Summary of Contents for 2009 V50
Page 1: ...VOLVO V50 Owner s Manual Web Edition ...
Page 2: ......
Page 8: ...Contents 8 12 12 Index Index 282 ...
Page 9: ...Contents 9 ...
Page 15: ...01 SAFETY ...
Page 47: ...01 Safety 01 47 ...
Page 49: ...02 INSTRUMENTS AND CONTROLS ...
Page 50: ...02 Instruments and controls Instrument overview 02 50 G019488 ...
Page 91: ...03 CLIMATE ...
Page 103: ...04 INTERIOR ...
Page 111: ...04 Interior Storage compartments 04 111 ...
Page 121: ...05 LOCKS AND ALARM ...
Page 137: ...06 STARTING AND DRIVING ...
Page 173: ...06 Starting and driving 06 173 ...
Page 175: ...07 WHEELS AND TIRES ...
Page 201: ...07 Wheels and tires 07 201 ...
Page 202: ...G020920 202 Washing and cleaning the car 204 Paint touch up 208 ...
Page 203: ...08 CAR CARE ...
Page 209: ...08 Car care 08 209 ...
Page 211: ...09 MAINTENANCE AND SERVICING ...
Page 239: ...09 Maintenance and servicing 09 239 ...
Page 241: ...10 AUDIO ...
Page 265: ...10 Audio 10 265 ...
Page 267: ...11 SPECIFICATIONS ...
Page 268: ...11 Specifications Label information 11 268 ...
Page 290: ...12 Index 12 290 ...
Page 291: ......
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