Needle Bearing Idler Sprocket Bore Diameter 1/2 in Chain Number 35 Sprocket Material Steel Number of Teeth 13 Outside Diameter 1.75 in Bearing Material Steel Bearing Type Needle Roller For Use With Tightener Shaft Hub Diameter 1 3/16 in Length through Bore 3/4 in Lubrication Grease Maximum Radial Load at Speed 226 lb @ 3500 rpm 237 lb @ 3000 rpm 250 lb @ 2500 rpm 269 lb @ 2000 rpm 294 lb @ 1500 rpm 331 lb @ 1000 rpm 406 lb @ 500 rpm 665 lb @ 100 rpm Sprocket Width 0.75 in