26" SEMI SLICK TYRES. Cheng Shin mountain bike tyres are engineered with advanced tread patterns. These patterns offer a great tread for use on single yet offering a fast rolling centre line. C-1271 offers a more knobbly pattern with a dimpled centre section. C-1096 has a solid slick centre section to the tyre. C-1383 has a smooth centre section with outer rows of medium knobs.