BMW i3 owners manual page 191

text version of content this owner's manual page from owners manual to the vehicle BMW i3, year of production 2013:

Seite 175 Wheels and tires Mobility Uniform Tire Quality Grading Temperature Quality grades can be found where applicableThe temperature grades are A, the highest, B, on the tire sidewall between tread shoulder and C, representing the tire's resistance to the and maximum section width. generation of heat and its ability to dissipate heat when tested under controlled conditions For example: Treadwear 200; Traction AA; on a specified indoor laboratory test wheel. Temperature A Sustained high temperature can cause the ma‐ terial of the tire to degenerate and reduce tire DOT Quality Grades life, and excessive temperature can lead to Treadwear sudden tire failure. The grade C corresponds Traction AA A B C to a level of performance which all passenger Temperature A B C car tires must meet under the Federal Motor Vehicle Safety Standard No. 109. Grades Band All passenger car tires must conform to Fed‐ A represent higher levels of performance on eral Safety Requirements in addition to these the laboratory test wheel than the minimum re‐ grades. quired by law. Treadwear Temperature grade for this tire The treadwear grade is a comparative rating The temperature grade for this tire is es‐ based on the wear rate of the tire when testedtablished for a tire that is properly inflated and under controlled conditions on a specified gov‐not overloaded. Excessive speed, underinfla‐ ernment test course. For example, a tire tion, or excessive loading, either separately or graded 150 would wear one and one-half, 1 g,in combination, can cause heat buildup and times as well on the government course as a possible tire failure. tire graded 100. The relative performance of If necessary, have the vehicle towed.◀ tires depends upon the actual conditions of their use, however, and may depart signifi‐ M+S cantly from the norm due to variations in driv‐ ing habits, service practices and differences inWinter and all-season tires with better cold road characteristics and climate. weather performance than summer tires. Traction Tire tread The traction grades, from highest to lowest, are AA, A, B, and C. Summer tires Those grades represent the tire's ability to Do not drive with a tire tread depth of less than stop on wet pavement as measured under 0.12 in/3 mm. controlled conditions on specified government test surfaces of asphalt and concrete. A tireThere is an increased danger of hydroplaning if marked C may have poor traction performance.the tire tread depth is less than 0.12 in/3 mm. The traction grade assigned to this tire is Winter tires based on straight-ahead braking traction tests, and does not include acceleration, cornering,Do not drive with a tire tread depth of less than hydroplaning, or peak traction characteristics.0.16 in/4 mm. Below a tread depth of 0.16 in/4 mm, tires are less suitable for winter operation. 175 Online Edition for Part no. 01 40 2 960 865 - II/15

owners manual BMW i3

owners manual BMW i3 - year of production: 2013 - BMW i3 owners manual EN