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Z4の取扱説明書・マニュアル [全248ページ 7.63MB]

Wheels and tires194TemperatureThe 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 cle Safety Standard No. 109. Grades B and A represent higher levels of performance on the laboratory test whee l 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 excessi ve loading, either sep-arately or in combination, can cause heat buildup and possible tire failure. <RSC - Run-Flat TiresYou will recognize Run-Flat Tires by a circular symbol containing the letters RSC on the side of the tire, refer to page 195.M+SWinter and all-season tires. These have better winter properties than sum-mer tires.XLDesignation for specia lly reinforced tires.Tire conditionInspect your tires freq uently 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 drop below 1/8 in/3mm, although, for exam ple, European legisla-tion only specifies a minimum tread depth of 1/16 in/1.6 mm. At tread depths below 1/8 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.When winter tires wear down past a tread depth of 1/6 in/4 mm, they become perceptibly less suitable for winter conditions. In the interest of safety, new tires sh ould be installed.Wear indicators in the ba se of the tread groove are distributed around th e tire's circumference; the letters TWI, for Tread Wear Indicator, on the tire's sidewalls identify tires that incorporate these wear indicators. On ce the tire tread has worn down to the wear indicators, the tire has worn to a depth of 1/16 in/1.6 mm.Wheel/tire damagePlease note that low-pr ofile tires cause wheels, tires and suspension parts to be more suscep-tible to road hazard and consequential damages.Unusual vibrations encountered during normal vehicle operation can indi cate 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 thor-oughly checked. To do so, drive carefully to the nearest BMW center or tire shop that works according to BMW repair procedures with cor-respondingly trained personnel. If necessary, have the vehicle towed there. Otherwise, tire damage can be extremely dan-gerous for vehicle occu pants and other road users.<

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