2010 Mercedes GLK-Class Owner's Manual - Page 244

242 Winter driving G Warning! Snow chains ! Some tire sizes do not leave adequate clearance for snow chains. To help avoid serious damage to your vehicle or tires, make sure the use of snow chains is permissible as specified in the "Technical data" section of this Operator's Manual. Snow chains should only be driven on snowcovered roads at speeds not to exceed 30 mph (50 km/h). Remove chains as soon as possible when driving on roads without snow. Observe the following guidelines when using snow chains: RUse of snow chains is not permissible with all wheel/tire combinations (Y page 331). RUse snow chains in pairs and on rear wheels only. Follow the manufacturer's mounting instructions. ! If snow chains are mounted to the front wheels, they may scrape against the body or axle components. The tires or the vehicle could be damaged as a result. ROnly use snow chains that are approved by Mercedes-Benz. Any authorized MercedesBenz Center will be glad to advise you on this subject. RUse of snow chains may be prohibited depending on location. Always check local and state laws before installing snow chains. RDo not use snow chains on the spare wheel. i When driving with snow chains, you may wish to switch off the ESP® (Y page 61) before setting the vehicle in motion. This will improve the vehicle's traction. Operation If you use your spare wheel when winter tires are fitted on the other wheels, be aware that the difference in tire characteristics may very well impair turning stability and that overall driving stability may be reduced. Adapt your driving style accordingly. Have the spare wheel replaced by a regular road wheel with a winter tire at the nearest authorized Mercedes-Benz Center. Always use winter tires at temperatures below 45‡ (7†) and whenever wintry road conditions prevail. Not all M+S rated tires provide special winter performance. Make sure the tires you use show the mountain/ snowflakeimarking on the tire sidewall. These tires meet specific snow traction performance requirements of the Rubber Manufacturers Association (RMA) and the Rubber Association of Canada (RAC) and have been designed specifically for use in snow conditions. Use of winter tires is the only way to achieve the maximum effectiveness of your vehicle's driving safety systems such as the ABS and the ESP® in winter operation. For safe handling, make sure all mounted winter tires are of the same make and have the same tread design. For information on winter tires for your vehicle model, see the "Technical data" section (Y page 331). Always observe the speed rating of the winter tires installed on your vehicle. After installing winter tires: X Check the tire inflation pressure and adjust it if necessary (Y page 221). X Restart the tire pressure loss warning system (Y page 222) or the Advanced Tire Pressure Monitoring System (Y page 224).