owners manual BMW Z4 E85 E86

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Tire coding BMW recommends the replacement of all tires every 6 years at the latest, even if a tire Understanding the lettering on the tire usage of 10 years is possible. sidewall makes it easier to identify and choose the correct tires. Uniform Tire Quality Grading Tire size Quality grades can be found where appli- cable on the tire sidewall between tread e.g. 225/50 R 16 92 Vshoulder and maximum section width. For Nominal width in mm example: At a glance Cross-sectional Treadwear 200 Traction AA ratio in % Temperature A Radial belt construction DOT quality grades Rim diameter in inches Treadwear Load index, Traction AA A B C not on ZR tires Temperature A B C Speed code letter, All passenger car tires must conform in front of the R on ZR tires to Federal Safety Requirements in Speed code letters addition to these grades.< Controls Q= up to 105 mph / 160 km/h Tread wear T= up to 118 mph / 190 km/h The tread wear grade is a comparative rat- H= up to 131 mph / 210 km/h ing based on the wear rate of the tire when V= up to 150 mph / 240 km/h tested under controlled conditions on a specified government test course. W= up to 167 mph / 270 km/h For example, a tire graded 150 would wear Y= up to 186 mph / 300 km/h one and one-half, 1 1/2, times as well on the government course as a tire graded Tire Identification Number 100. The relative performance of tires Tires with DOT codes meet the guidelines depends upon the actual conditions of their Driving tips of the U.S. Department of Transportation. use, however, and may depart significantly DOT code: from the norm due to variations in driving habits, service practices and differences in e.g. DOT xxxx xxx 3603road characteristics and climate. Manufacturer's code Traction for tire brand Tire size and The traction grades, from highest to lowest, tire version are AA, A, B and C. Tire age Those grades represent the tire's ability to stop on wet pavement as measured under Tire age controlled conditions on specified govern-Mobility ment test surfaces of asphalt and concrete. The date on which the tire was manufac-A tire marked C may have poor traction tured is indicated by the code on the side-performance. wall: The traction grade assigned to this DOT … 3603 indicates that the tire was tire is based on straight-ahead brak- manufactured in week 36 of the year 2003.ing traction tests, and does not include acceleration, cornering, hydroplaning, or peak traction characteristics.< 77 Online Version for Part No. 01 41 0 157 498 - © 10/03 BMW AGReference

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