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MINIの取扱説明書・マニュアル [全172ページ 1.90MB]

109OVERVIEW REPAIRS OPERATION CONTROLS DATA INDEXTIRE CODING TIRE CONDITION Traction The traction grades, from highest to low-est, are AA, A, B, and C. Those grades represent the tire‘s ability to stop on wet pavement as measured under controlled conditions on specified govern-ment test surfaces of asphalt and concrete. A tire marked C may have poor traction per-formance.The traction grade assigned to this tire is based on straight-ahead brak-ing traction tests, and does not include acceleration, cornering, hydroplaning, or peak traction characteristics. <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 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 represent higher levels of performance on the labora-tory 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 fail-ure. <RSC: Run-Flat Tires You will recognize Run-Flat Tires by a circu-lar symbol containing the letters RSC on the side of the tire, refer to page 111 .M+S Winter and all-season tires. These have better winter performance properties than summer tires.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 1/8in/3mm even though in Europe, for example, the legally specified minimum tread depth is only 1/16in/1.6 mm.Below 1/8 in/3 mm tread depth, there is a very high danger of hydroplaning at higher speeds, even with only small amounts of water on the road.At tread depths be low approx. 1/6in/4mm, the ability of winter tires to cope with winter driving conditions decreases perceptibly. For safety reasons, new tires should be mounted.

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