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Z4の取扱説明書・マニュアル [全120ページ 3.44MB]

Wheels and tires78TemperatureThe 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 con-trolled conditions on a specified indoor lab-oratory 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 Vehicle Safety Standard No. 109. Grades B and A repre-sent 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 load-ing, either separately or in combination, can cause heat buildup and possible tire failure.<RSC: Run Flat tiresRun Flat tires are labeled on the sidewall with a circular symbol containing the letters RSC. Refer to page 80.M+SWinter and all-season tires.These have better winter performance properties than summer tires.Tire condition Inspect your tires frequently 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 example, the legally specified 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 hydroplaning, even at relatively moderate speeds and with only small amounts of water on the road.At tread depths below approx. 1/6 in/4 mm, winter tires display a perceptible decrease in their ability to cope with winter driving conditions, and should be replaced in the interest of safety.Tread wear indicators in the tread-groove base, see arrow, are distributed around the wheel circumference and are labeled on the tire sidewall as TWI, Tread Wear Indica-tor. At a tread depth of 1/16 in/1.6 mm, the indicators signal that the legally permissi-ble wear limit has been reached.Tire damage Unusual vibrations encountered dur-ing normal vehicle operation can indi-cate tire failure or some other vehicle mal-function. This type of problem can be caused by contact with curbs, etc. This is also true for irregularities in the vehicle's handling characteristics, such as a pro-nounced tendency to pull to the left or right. Should this occur, respond by immediately reducing your speed. Proceed carefully to the nearest BMW center or professional tire center, or have the vehicle towed there to have it and its wheels or tires inspected. 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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