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X3の取扱説明書・マニュアル [全139ページ 4.74MB]

Wheels and tires94TemperatureThe temperature grades are A, B, and C, A being highest, and represent the tire's resis-tance to the generation of heat and its ability to dissipate heat when tested under controlled conditions on a specified indoor laboratory test wheel. Sustained high temperature can cause the material of the tire to degenerate and reduce tire life, and excessive temperature can lead to sudden tire failure. The grade C corre-sponds to a level of performance that all pas-senger car tires must meet under the Federal Motor Vehicle Safety Standard No. 109. Grades B and A represent higher levels of performance on the laboratory test wheel than the minimum required by law.The temperature grade for this tire is established for a tire that is properly inflated and not overloaded. Excessive speed, underinflation, or excessive loading, either sep-arately or in combination, can cause heat buildup and possible tire failure. <M+SWinter and all-season tires.These have better winter properties than sum-mer tires.Tire conditionInspect your tires frequently for tread wear, signs of damage and for foreign objects lodged in the tread. Check the tread depth.Minimum tread depthThe tread depth should not fall below 0.12 in/3 mm. At tread depths below 0.12 in/3 mm, there is an increased risk of high-speed hydro-planing, even when only small amounts of water are present on the road surface.Winter tires display a noticeable loss in their ability to cope with cold-weather driving condi-tions once the tread wears to below 0.16 in/4 mm. To ensure continued safety you should always have such tires replaced.Wear indicators at the tread-groove base, refer to arrow, are distributed over the tire's circum-ference and are marked on the side of the tire with TWI - Tread Wear Indicator. If the tire tread has worn down to the wear indicators, then the legally permissible tread depth limit of 0.063 in/1.6 mm has been reached.Wheel/tire damagePlease note that low-profile tires, make wheels, tires and suspension parts more susceptible to road hazard and consequential damages.<Unusual vibrations encountered during normal vehicle operation can indicate tire failure or some other vehicle defect. This can, for exam-ple, be caused by driving over curbs. The same applies to any other abnormal road behavior, such as pulling severely to the right or left.In these cases, reduce speed immedi-ately and have wheels and tires checked immediately. Drive carefully to the nearest BMW Sports Activity Vehicle Center or tire spe-cialist. Have the vehicle towed to one of these locations if necessary.Tire damage can pose a potentially lethal safety hazard for the vehicle's occupants and other road users alike.<New wheels and tiresHave new wheels and tires installed only by your BMW Sports Activity Vehicle Center or a tire shop that works according to BMW repair procedures with correspondingly trained personnel. If this work is not carried out properly, there is a danger of subsequent dam-

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