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X3の取扱説明書・マニュアル [全211ページ 8.62MB]

TreadwearThe treadwear grade is a comparative ratingbased on the wear rate of the tire when testedunder controlled conditions on a specified gov‐ernment test course. For example, a tire graded150 would wear one and one-half, 1 g, times aswell on the government course as a tire graded100. The relative performance of tires dependsupon the actual conditions of their use, however,and may depart significantly from the norm dueto variations in driving habits, service practicesand differences in road characteristics and cli‐mate.TractionThe traction grades, from highest to lowest, areAA, A, B, and C.Those grades represent the tire's ability to stopon wet pavement as measured under controlledconditions on specified government test surfa‐ces of asphalt and concrete. A tire marked C mayhave poor traction performance.The traction grade assigned to this tire is basedon straight-ahead braking traction tests, anddoes not include acceleration, cornering, hydro‐planing, or peak traction characteristics.TemperatureThe temperature grades are A, the highest, B,and C, representing the tire's resistance to thegeneration of heat and its ability to dissipateheat when tested under controlled conditionson a specified indoor laboratory test wheel. Sus‐tained high temperature can cause the materialof the tire to degenerate and reduce tire life, andexcessive temperature can lead to sudden tirefailure. The grade C corresponds to a level ofperformance which all passenger car tires mustmeet under the Federal Motor Vehicle SafetyStandard No. 109. Grades Band A representhigher levels of performance on the laboratorytest wheel than the minimum required by law.Temperature grade for this tireThe temperature grade for this tire is es‐tablished for a tire that is properly inflated andnot overloaded. Excessive speed, underinfla‐tion, or excessive loading, either separately or incombination, can cause heat buildup and pos‐sible tire failure.If necessary, have the vehicle towed.◀RSC – Run-flat tiresRun-flat tires, refer to page 162 , are labeled witha circular symbol containing the letters RSCmarked on the sidewall.M+SWinter and all-season tires with better coldweather performance than summer tires.Tire treadSummer tiresDo not drive with a tire tread depth of less than0.12 in/3 mm.There is an increased danger of hydroplaning ifthe tread depth is less than 0.12 in/3 mm.Winter tiresDo not drive with a tire tread depth of less than0.16 in/4 mm.Below a tread depth of 0.16 in/4 mm, tires areless suitable for winter operation.Seite 159Wheels and tires Mobility159Online Edition for Part no. 01 40 2 903 813 - 07 12 490

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