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2. Tire maintenance - Wikipedia

   en.wikipedia.org/wiki/Tire_maintenance

   Tire maintenance for motor vehicles is based on several factors. The chief reason for tire replacement is friction from moving contact with road surfaces, causing the tread on the outer perimeter of tires to eventually wear away. When the tread depth becomes too shallow, like for example below 3.2 mm (4/32 in), the tire is worn out and should ...

3. Tire changer - Wikipedia

   en.wikipedia.org/wiki/Tire_changer

   Motorcycle tire changers mainly provide a simple bead loosening system and rim clamps powered manually. Certain motorcycle tire changers can accommodate wheel diameters as small as 10 inches (250 mm) and wheels at least 1 + 1 ⁄ 2 inches (38 mm) wide. [4] In addition, small atv wheels and tires are used on motorcycle tire changers.

4. Porsche 917 - Wikipedia

   en.wikipedia.org/wiki/Porsche_917

   The Porsche 917 is a sports prototype race car developed by German manufacturer Porsche to exploit the regulations regarding the construction of 5-litre sports cars. Powered by a Type 912 flat-12 engine which was progressively enlarged from 4.5 to 5.0 litres, the 917 was introduced in 1969 and initially proved unwieldy on the race track but continuous development improved the handling and it ...