Z4の取扱説明書・マニュアル [全120ページ 3.44MB]
123816.pdf
gizport - 2013-09-06
http://153.127.246.254/.../123816.pdf - 3.44MB
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ReferenceAt a glanceControlsDriving tipsMobility 77Tire codingUnderstanding the lettering on the tire sidewall makes it easier to identify and choose the correct tires.Tire size e.g. 225/50 R 16 92 VNominal width in mm Cross-sectionalratio in % Radial belt construction Rim diameter in inches Load index, not on ZR tiresSpeed code letter, in front of the R on ZR tiresSpeed code lettersQ= up to 105 mph / 160 km/hT= up to 118 mph / 190 km/hH= up to 131 mph / 210 km/hV= up to 150 mph / 240 km/hW= up to 167 mph / 270 km/hY= up to 186 mph / 300 km/hTire Identification NumberTires with DOT codes meet the guidelines of the U.S. Department of Transportation. DOT code:e.g. DOT xxxx xxx 3603Manufacturer's code for tire brandTire size and tire version Tire age Tire ageThe date on which the tire was manufac-tured is indicated by the code on the side-wall:DOT チc 3603 indicates that the tire was manufactured in week 36 of the year 2003.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 GradingQuality grades can be found where appli-cable on the tire sidewall between tread shoulder and maximum section width. For example:Treadwear 200 Traction AA Temperature ADOT quality gradesTreadwear Traction AA A B C Temperature A B C All passenger car tires must conform to Federal Safety Requirements in addition to these grades. <Tread wearThe tread wear grade is a comparative rat-ing based on the wear rate of the tire when tested under controlled conditions on a specified government test course. For example, a tire graded 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 may depart significantly from the norm due to variations in driving habits, service practices and differences in road characteristics and climate.TractionThe traction grades, from highest to lowest, are AA, A, B and C. Those grades represent the tire's ability to stop on wet pavement as measured under controlled conditions on specified govern-ment test surfaces of asphalt and concrete. A tire marked C may have poor traction performance.The traction grade assigned to this tire is based on straight-ahead brak-ing traction tests, and does not include acceleration, cornering, hydroplaning, or peak traction characteristics. <
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