<p>Size: 14 Inch Fits For Tire Diameter 60~69cm </p><p>Size: 15 Inch Fits For Tire Diameter 70~75cm </p><p>Size: 16 Inch Fits For Tire Diameter 76~79cm </p><p>Size: 17 Inch Fits For Tire Diameter 80~83cm.</p><p>How To Calculate Your Tire' Diameter? If Your Tire Is Written With P215/60R16, A=215 B=60 C=16.Tire Diameter=A*B/500+C*2.54 =215*60/500+16*2.54 =66.44cm,You Need To Buy The 14 Inch One.</p>