Gates T215RB Blue Racing Timing Belt Belts are precision ground, not cut, so they fit the pulley with absolute perfection 143 Teeth, 1 inch(25mm) top width, .315 inch(8mm) pitch, 45.039 inch(1144mm) pitch Length of stock belts Durable nylon fiber provides extra wear resistance, doubling tooth strength Aramid reinforcement in a patented EPDM compound for three times the heat resistance and durability of standard belt Patented EPDM compound gives Gates Racing belts extended service life