BMW X3 F25 owners manual page 205

text version of content this owner's manual page from owners manual to the vehicle BMW X3 F25, year of production 2010:

Seite 201 Wheels and tires Mobility Traction AA A B C car tires must meet under the Federal Motor Vehicle Safety Standard No. 109. Grades Band Temperature A B C A represent higher levels of performance on All passenger car tires must conform to Fed‐ the laboratory test wheel than the minimum re‐ eral Safety Requirements in addition to these quired by law. grades. Temperature grade for this tire Treadwear The temperature grade for this tire is es‐ The treadwear grade is a comparative ratingtablished for a tire that is properly inflated and based on the wear rate of the tire when testednot overloaded. Excessive speed, underinfla‐ under controlled conditions on a specified gov‐tion, or excessive loading, either separately or ernment test course. For example, a tire in combination, can cause heat buildup and graded 150 would wear one and one-half, 1 g,possible tire failure. times as well on the government course as a If necessary, have the vehicle towed.◀ tire graded 100. The relative performance of tires depends upon the actual conditions of RSC – Run-flat tires their use, however, and may depart signifi‐ Run-flat tires, refer to page 204, are labeled cantly from the norm due to variations in driv‐ with a circular symbol containing the letters ing habits, service practices and differences in RSC marked on the sidewall. road characteristics and climate. M+S Traction Winter and all-season tires with better cold The traction grades, from highest to lowest, weather performance than summer tires. are AA, A, B, and C. Those grades represent the tire's ability to stop on wet pavement as measured under Tire tread controlled conditions on specified government test surfaces of asphalt and concrete. A tire Summer tires marked C may have poor traction performance. Do not drive with a tire tread depth of less than The traction grade assigned to this tire is 0.12 in/3 mm. based on straight-ahead braking traction tests, There is an increased danger of hydroplaning if and does not include acceleration, cornering, the tire tread depth is less than 0.12 in/3 mm. hydroplaning, or peak traction characteristics. Winter tires Temperature Do not drive with a tire tread depth of less than The temperature grades are A, the highest, B, 0.16 in/4 mm. and C, representing the tire's resistance to the generation of heat and its ability to dissipate Below a tread depth of 0.16 in/4 mm, tires are heat when tested under controlled conditions less suitable for winter operation. on a specified indoor laboratory test wheel. Sustained high temperature can cause the ma‐ terial 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 201 Online Edition for Part no. 01 40 2 960 386 - II/15

owners manual BMW X3 F25

owners manual BMW X3 F25 - year of production: 2010 - BMW X3 F25 owners manual EN