BMW Z4 Roadster 3.0si 2007 - Manual (Page 88)

Wh
eels
and
tire
s
86
Z4 Coupe 3.0si
Tire coding
Understanding the lettering on the tire sidewall
makes it easier to identify and choose the cor-
rect tires.
Tire size
Speed code letter
Q = up to 100 mph or 160 km/h
T = up to 118 mph or 190 km/h
H = up to 131 mph or 210 km/h
V = up to 150 mph or 240 km/h
W = up to 167 mph or 270 km/h
Y = up to 186 mph or 300 km/h
Tire Identification Number
Tires with DOT codes meet the guidelines of
the U.S. Department of Transportation.
DOT code:
Tire age
The date on which the tire was manufactured is
indicated by the code on the sidewall:
DOT … 5005 indicates that the tire was manu-
factured in week 50 of the year 2005.
BMW recommends the replacement of all tires
every 6 years at the latest, even if a tire usage of
10 years is possible.
Uniform Tire Quality Grading
Quality grades can be found where applicable
on the tire sidewall between tread shoulder and
maximum section width. For example:
Treadwear 200 Traction AA
Temperature A
DOT Quality Grades
Tread wear
Traction AA A B C
Temperature A B C
Tire size Pressure specifications in psi/kPa
All pressure specifications in the table are
indicated in psi/kilopascal with cold tires,
cold = ambient temperature
225/45 R 17 91 W
225/45 R 17 91 H/V M+S
33/230 39/270
Front: 225/45 R 17 91W
Rear: 255/40 R 17 94 W 33/230
–
–
39/270
Front: 225/40 R 18 88 W
Rear: 255/35 R 18 90 W 33/230
–
–
39/270
You will find more information about permissible loads and weights on page 113 .
e.g.
Nominal width in mm
Aspect ratio in
Ξ
Radial belt construction
Rim diameter in inches
Load rating,
not on ZR tires
Speed code letter, in
front of the R on ZR tires
225/50 R 1 6 92 V
e.g.
Manufacturer's code
for tire make
Tire size and
tire design
Tire age DOT xxxx xxx 5005
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