Gates T167RB Blue Racing Timing Belt Belts are precision ground, not cut, so they fit the pulley with absolute perfection Kit Includes T167 and T168. T167 specs (153 Teeth, 1.14 inch(29mm) top width, .375 inch(9.5mm) pitch, 57.38 inch(1457.325mm) pitch Length). T168 Specs (65 Teeth, 5 inch(12.7mm) top width, .315 inch(8mm) pitch, 20.47 inch(520mm) pitch Length) 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