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X3の取扱説明書・マニュアル [全126ページ 4.65MB]

ReferenceAt a glanceControlsDriving tipsMobility 85Temperature The temperature grades are A, the highest, B and C, representing the tire's resistance 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 corresponds to a level of performance which all passenger car tires must meet under the Federal Motor Vehi-cle 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 condition Inspect your tires frequently for tread wear, signs of damage and for foreign objects lodged in the tread. Check the tread pattern depth.Tire tread The tread depth should not drop below 0.12 in/3 mm, although, for example, European legisla-tion only specifies a minimum tread depth of 0.063 in/1.6 mm. At tread depths below 0.12 in/3 mm, there is an increased risk of high-speed hydroplaning, even when only small amounts of water are present on the road surface. As winter tires dis-play a noticeable loss in their ability to cope with cold-weather driving conditions once the tread wears to below 0.16 in/4 mm, to ensure contin-ued 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. At a tread depth of 0.063 in/1.6 mm these indicators, sig-nal that the tires have reached the legally per-missible wear limit.Wheel/tire damage Due to low-profile tires, please note that wheels, tires and suspension parts are more susceptible to road hazard and conse-quential 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. These kinds of problems may also be signaled by other changes in vehicle response, such as a strong tendency to pull to the left or right.In these cases reduce speed immedi-ately. Drive carefully to the next BMW Sports Activity Vehicle Center or tire dealer, or have the vehicle towed to one of these locations if necessary.Tire damage, extending to sudden and com-plete loss of pressure in extreme cases, can pose a potentially lethal safety hazard for the vehicle's occupants and other road users alike.<

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