owners manual Mercedes B

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314 All about wheels and tires Example: Thesafespeedonawet,snowcoveredoricy road is always lower than on dry road surfa- RTreadweargrade:200 ces. RTraction grade: AA Youshouldpayspecialattentiontoroadcon- RTemperaturegrade:A ditions when temperatures are around freez- All passenger car tires must conform to the ing point. statutory safety requirements in addition to Mercedes-Benz recommends a minimum these grades. tread depth of ã in (4 mm) on all four winter tires. Observe the legally required minimum iTheactualvaluesfortires are vehicle- tiretreaddepth(Ypage301).Wintertirescan specific andmaydeviatefromthevaluesin reducethebrakingdistanceonsnow-covered the illustration. surfaces in comparison with summer tires. Thebrakingdistanceisstillmuchfurtherthan Treadwear onsurfaces that are not icy or covered with The treadwear grade is a comparative rating snow. Take appropriate care when driving. basedonthewearrateofthetirewhentested Further information on winter tires (M+S under controlled conditions on a specified tires) (Y page 302). U.S. government course. For example, a tire graded 150 would wear one and one-half Temperature s times as well on the government course as a tire graded 100. GWARNING tire The relative performance of tires depends The temperature grade for this tire is estab- upontheactual conditions of their use, how- lished for a tire that is properly inflated and and ever, and may depart significantly from the not overloaded. Excessive speed, underinfla- s normduetovariations in driving habits, ser- tion,orexcessiveloading,eitherseparatelyor el vice practices and differences in road char- in combination, can cause excessive heat acteristics and climate. build-up and possible tire failure. Whe Traction ThetemperaturegradesareA(thehighest),B, and C, representing the tire's resistance to GWARNING the generation of heat and its ability to dissi- The traction grade assigned to this tire ispate heat when tested under controlled con- based on straight-ahead braking tractionditions on a specified indoor laboratory test tests, and does not include acceleration, cor-wheel.Sustainedhightemperaturecancause nering, hydroplaning, or peak traction char-the material of the tire to degenerate and acteristics. reduce tire life, and excessive temperature can lead to sudden tire failure. The grade C !Avoidwheelspin.Thiscanleadtodamage corresponds to a level of performance which to the drive train. all passenger car tires must meet under the Federal Motor Vehicle Safety Standard No. Thetractiongrades–fromhighesttolowest– 109. Grades B and A represent higher levels are AA, A, B and C. Those grades represent of performance on the laboratory test wheel the tire's ability to stop on wet pavement as than the minimum required by law. measured under controlled conditions on specifiedgovernmenttestsurfacesofasphalt andconcrete.AtiremarkedCmayhavepoor traction performance.

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