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Z4の取扱説明書・マニュアル [全120ページ 3.82MB]

ReferenceAt a glanceControlsDriving tipsMobility 81TemperatureThe 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 la boratory 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, under-inflation, or excessive loading, either separately or in combination, can cause heat buildup and possible tire failure. <RSC: Run Flat tires Run Flat tires are labeled on the sidewall with a circular symbol containing the letters RSC. Refer to page82.M+SWinter and all-season tires.These have better winter performance proper-ties than summer tires.Tire condition Inspect your tires freq uently for tread wear, signs of damage and for foreign objects lodged in the tread. Check the tread depth.Tire tread Tread depth should not be allowed to go below 1/8 in / 3 mm even though in Europe, for exam-ple, the legally specif ied minimum tread depth is only 1/16 in / 1.6 mm. Below 1/8 in / 3 mm tread depth, there is a very high risk of hydro-planing, even with only small amounts of water on the road and at relatively moderate speeds.At tread depths below approx. 1/6in/ 4mm, winter tires display a perceptible decrease in their ability to cope with winter driving condi-tions, and should be repl aced in the interest of safety.Tread wear indicators in the tread-groove base, see arrow, are distributed around the wheel cir-cumference and are labele d on the tire sidewall as TWI, Tread Wear Indi cator. At a tread depth of 1/16 in / 1.6 mm, the indicators signal that the legally permissible wear limit has been reached.Wheel/tire damage Due to low-profile tire s, please note that wheels, tires and suspension parts are more susceptible to road hazards and conse-quential damages.<Unusual vibrations encountered during normal vehicle operation can indi cate tire failure or some other vehicle malfun ction. This type of problem can be caused by contact with curbs, etc. This is also true for irregularities in the vehi-cle's handling characteristics, such as a pro-nounced tendency to pull to the left or right.Should this occur, respond by immedi-ately reducing your speed. Proceed care-fully to the nearest BMW center or professional tire center, or have the vehicle towed there.Tire damage up to and including sudden and complete air loss can pose an extreme hazard for both vehicle occupants and other road users.<

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