2010 BMW X3 Owner's Manual - Page 100
2010 BMW X3 Manual
Page 100 highlights
Wheels and tires Temperature 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 that all passenger car tires must meet under the Federal Motor Vehicle 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 separately or in combination, can cause heat buildup and possible tire failure.< Wear indicators at the tread-groove base, refer to arrow, are distributed over the tire's circumference and are marked on the side of the tire with TWI - Tread Wear Indicator. If the tire tread has worn down to the wear indicators, then the legally permissible tread depth limit of 0.063 in/ 1.6 mm has been reached. Wheel/tire damage Please note that low-profile tires, make wheels, tires and suspension parts more susceptible to road hazard and consequential damages.< Unusual vibrations encountered during normal vehicle operation can indicate tire failure or some other vehicle defect. 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 immediately and have wheels and tires checked immediately. Drive carefully to the nearest BMW Sports Activity Vehicle Center or tire specialist. Have the vehicle towed to one of these locations if necessary. Tire damage can pose a potentially lethal safety hazard for the vehicle's occupants and other road users alike.< M+S Winter and all-season tires. These have better winter 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. Minimum tread depth The tread depth should not fall below 0.12 in/ 3 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. Winter tires display 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 continued safety you should always have such tires replaced. New wheels and tires Have new wheels and tires installed only by your BMW Sports Activity Vehicle Center or a tire shop that works according to BMW repair procedures with correspondingly trained personnel. If this work is not carried out properly, there is a danger of subsequent dam- 98 Online Edition for Part no. 01 41 2 602 348 - © 02/09 BMW AG
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