Various practices are involved in tire and wheel maintenance to maximize tire life and ensure safe driving. Use a torque wrench to tighten lug bolts crosswise and drive safely to avoid rapid accelerations, abrupt stops, hard cornering that may increase tire wear rates. Properly inflated tires, regular rotation of tires and checking for alignment periodically assist to enhance the life of your tires. You need frequent checks on your treads so as to correct things like bubbles, deep slashes or underinflation. When it comes to rotating their tires around, BMW tends not recommend this because of differences in suspension design between front and rear tires. However if desired, it ought to be done every 3000 miles (5000 km) taking into account carefully the tire pressures together with the spare tire's participation. While selecting appropriate tires for your vehicle, some important factors include; size, construction type, load rating and speed rating among others. Slippery conditions require snow tires while four snow tires should be used for stability since they can affect non-snow performance of a vehicle. Tire storage is proper when they are kept inflated in a cool dry place away from an upright position. Tread wear indicators along with tread depth gauges or Lincoln penny checks can also indicate when you need new ones. To avoid damage or scratches you should use mild soap when cleaning magnesium, aluminum alloy or sport wheels which should not come into contact with abrasive cleaners or harsh chemicals including salt and sand damage during winter where removing the wheels helps in protecting them from these damages however this is such special care required for magnesium-alloyed aluminum wheels etcetera unlike lug nut torques which should always remain the same according to the manufacturer's guidelines.