This 10 tooth jackshaft sprocket is used with size #40, #41, and 420 chain found on many go-kart and mini bikes. It uses the common 5/8" bore (inside) diameter 605465 - BASE IDLER PULLEY MOUNT - HUSTLER Genuine Part This V-Groove Drive Pulley is recommended as an OEM Replacement only. Aazon.co : Phoenix fg. 6 Inch Dia 1 1/8 Inch Bore Steel V-Groove... This part is Painted Black to prevent rusting. It has a hub attached and the inside diameter is 1 1/8''. Belts That Fit: 4L/A Front Side Offset: 1.695 Back Side Offset: 1.425 Phoenix Mfg. 8 Inch Dia 1 3/16 Inch Bore Steel V-Groove
