2008 BMW Z4 M Series Owner's Manual - Page 88
2008 BMW Z4 M Series Manual
Page 88 highlights
Wheels and tires Z4 Coupe 3.0si 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 Front: 225/45 R 17 91W Rear: 255/40 R 17 94 W Front: 225/40 R 18 88 W Rear: 255/35 R 18 90 W 33/230 33/230 - 33/230 - 39/270 - 39/270 - 39/270 You will find more information about permissible loads and weights on page 113. Tire coding Understanding the lettering on the tire sidewall makes it easier to identify and choose the correct tires. DOT code: e.g. DOT xxxx xxx 5005 Tire size e.g. 225/50 R 16 92 V 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 Manufacturer's code for tire make Tire size and tire design Tire age 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 manufactured 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. Speed code letter Q = up to 100 mph or 160 km/h T V Y = up to 118 mph or 190 km/h = up to 150 mph or 240 km/h = up to 186 mph or 300 km/h H = up to 131 mph or 210 km/h W = up to 167 mph or 270 km/h 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 Identification Number Tires with DOT codes meet the guidelines of the U.S. Department of Transportation. 86 Online Edition for Part no. 01 41 0 014 500 - © 08/07 BMW AG