BMW Z4 E89 owners manual page 89

text version of content this owner's manual page from owners manual to the vehicle BMW Z4 E89, year of production 2008:

All passenger car tires must conform to The temperature grade for this tire is Federal Safety Requirements in addition established for a tire that is properly to these grades.< inflated and not overloaded. Excessive speed, underinflation, or excessive loading, either sep-e Tread wear arately or in combination, can cause heat The tread wear grade is a comparative rating buildup and possible tire failure<.anc l based on the wear rate of the tire when tested g RSC: Run-Flat Tires a under controlled conditions on a specified gov- t ernment test course. Run-Flat tires are labeled on the sidewall with a A For example, a tire graded 150 would wear one circular symbol containing the letters RSC. and one-half, 1 γ, times as well on the govern-Refer to page88. ment course as a tire graded 100. The relative performance of tires depends upon the actual M+S conditions of their use, however, and may Winter and all-season tires. depart significantly from the norm due to varia-These have better winter performance proper- tions in driving habits, service practices and dif-ties than summer tires.ls ferences in road characteristics and climate. o r t n Traction Tire condition Co The traction grades, from highest to lowest, are Inspect your tires frequently for tread wear, AA, A, B and C. signs of damage and for foreign objects lodged Those grades represent the tire's ability to stop in the tread. Check the tread depth. on wet pavement as measured under controlled conditions on specified government test sur-Minimum tread depth faces of asphalt and concrete. A tire marked C s may have poor traction performance.The tread depth should not drop below 1/8in/ The traction grade assigned to this tire is 3mm, although, for example, European legisla-g tip based on straight-ahead braking traction tion only specifies a minimum tread depth of in tests, and does not include acceleration, cor-1/16in/1.6mm. At tread depths below 1/8in/iv r nering, hydroplaning, or peak traction charac-3mm there is an increased risk of high-speed D teristics.< hydroplaning, even when only small amounts of water are present on the road surface. Temperature When winter tires wear down past a tread depth The temperature grades are A, the highest, B of 1/6 in/4 mm, they become perceptibly less and C, representing the tire's resistance to the suitable for winter conditions. In the interest of generation of heat and its ability to dissipate safety, new tires should be installed. heat when tested under controlled conditions y on a specified indoor laboratory test wheel. ilit Sustained high temperature can cause the b material of the tire to degenerate and reduce o M 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 Vehi- cle Safety Standard No. 109. Grades B and A represent higher levels of performance on the Wear indicators in the base of the tread groove e laboratory test wheel than the minimum are distributed around the tire's circumference; c required by law. n re e 87 f Re

owners manual BMW Z4 E89

owners manual BMW Z4 E89 - year of production: 2008 - BMW Z4 E89 owners manual EN