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5. Z4 の取扱説明書・マニュアル

Z4の取扱説明書・マニュアル [全128ページ 4.41MB]

Wheels and tires84the letters TWI, for Tread Wear Indicator, on the tire's sidewalls identify tires that incorporate these wear indicators. Once 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 damageDue to low-profile tires, 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 indicate tire failure or some other vehicle malfunction. This can, for example, 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.Tire damage can be extremely dangerous for vehicle occupants and other road users. <Tire ageFor various reasons, such as the development of brittleness, BMW recommends tire replace-ment after no more than 6 years, regardless of the actual wear of the tires.The date on which the tire was manufactured is indicated by the code on the sidewall:DOT ﾁc 5005 indicates that the tire was manu-factured in week 50 of the year 2005.Run-Flat TiresThe symbol identifying Run-Flat Tires is a circle with the letters RSC on the sidewall. Run-Flat Tires comprise a conditionally self-supporting tire and a special rim. The reinforce-ment in the sidewalls ensures that the tire can continue to be used subject to certain restric-tions, even if depressurized.For information on continuing to drive with a flat tire, refer to Flat tire warning on page 51.Wheel and tire replacementHave new wheels and tires installed only by your BMW Center or tire shop that works according to BMW repair procedures with correspondingly trained personnel. Work that is improperly carried out could result in consequential damage and pose safety haz-ards. Make sure that the new wheels are bal-anced.<Retreaded tiresBMW advises against using retreaded tires, since driving safety may be impaired. The causes for this include potentially different tire casing structures and often wide variations in tire age, which can result in a lim-ited service life.<Correct wheels and tiresBMW recommends using only wheels and tires that have been approved by BMW for your particular vehicle model, other-wise body contact and serious accidents can result despite the use of the same nominal size, e.g. due to manufacturing tolerances. If non-

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