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owners manual Mercedes SL
owners manual Mercedes SL - year of production: 2012 - Mercedes Benz SL R231 owners manual EN
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from owners manual to the vehicle Mercedes SL, year of production 2012:
All about wheels and tires589
Treadwear
All about wheels and tires
The treadwear grade is a comparative rating
UniformTire Quality Grading
basedonthewearrateofthetirewhentested
Standards
under controlled conditions on a specified
OverviewofTireQuality Grading U.S. government course. For example, a tire
Standards 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
upontheactual 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 conditions.
Traction
GWARNING
Uniform Tire Quality Grading Standards are
The traction grade assigned to this tire is
U.S. government specifications. Their
based on straight-ahead braking traction
purpose is to provide drivers with uniform
tests, and does not include acceleration,
reliableinformationontireperformancedata.
cornering, hydroplaning, or peak traction
Tire manufacturers have to grade tires using
characteristics.
three performance factors: treadwear
tires
grade:,tractiongrade;andtemperature
!Avoidwheelspin.Thiscanleadtodamage
grade =. These regulations do not apply to
to the drive train. and
Canada. Nevertheless, all tires sold in North
The traction grades, from highest to lowest,
Americaareprovidedwiththecorresponding
are AA, A, B, and C. Those grades represent
quality grading markings on the sidewall of
the tire's ability to stop on a wet surface as
the tire.
Wheels
measuredundercontrolled conditions on
Whereapplicable, the tire grading
specifiedgovernmenttestsurfacesofasphalt
information can be found on the tire sidewall
andconcrete.AtiremarkedCmayhavepoor
between the tread shoulder and maximum
traction performance.
tire width.
Thesafespeedonawet,snowcoveredoricy
Example:
road is always lower than on dry road
R
Treadweargrade:200
surfaces.
R
Traction grade: AA
Youshould pay special attention to road
R
Temperaturegrade:A conditions when temperatures are around
freezing point.
All passenger car tires must conform to the
statutory safety requirements in addition toMercedes-Benz recommends a minimum
these grades. tread depth of ã in (4 mm) on all four winter
tires. Observe the legally required minimum
iTheactualvaluesfortires are vehicle-
tiretreaddepth(Ypage577).Wintertirescan
specific andmaydeviatefromthevaluesin
reducethebrakingdistanceonsnow-covered
the illustration.
surfaces in comparison with summer tires.
Thebrakingdistanceisstillmuchfurtherthan
Z
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Mercedes Benz SL R231 owners manual
pages 588 - 594
Mercedes Benz SL R231 owners manual
page 591 / 618
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