Cheng Shin M933 & M934 RAZR 2 tires are hard-wearing tires uniquely designed for cross country terrain races such as the Grand National Cross Country race series. The RAZR2 M933 and M934 tires are made of superior grade rubber with a 6 Ply rated Polyester carcass that betters traction control and improves puncture resistance on the tires. Maxxis RAZR2 M933 and M934 tires are available in 20", 21", 22inch and 23" tire options. Their unique tread design allows for better braking and on-line steering.