OEM-GT Rear Sprocket & Hub Set For Mini Bike Go Kart 44 Tooth For 40/41/420 Chain 1.25'' Axles. OEM-GT Rear Sprocket Mini Bike Go Kart 44 Tooth 40/41/420 Chain. DIMENTIONS: Brand new heavy duty 44T rear sprocket. Mount Hole Distance 2-1/16'' and 2-7/8'' across. OD of sprocket 7-1/4'' and ID is 2''. Material : Steel. INCLUDES: OEM-GT Brand new zinc plated hub used for 4'' and 4.5'' brake drums or rear axle sprockets. Dimensions : 4" Outer Diameter. 1-1/4" Bore with 1/4" keyway & 2 Set Screws. (4) 1/4" Bolt Holes on a 3.228" Bolt Hole Circle. (4) 3/8" Bolt Holes on a 2 -1/8" Bolt Hole Circle and 2-7/8'' across. Mounting hardware and 1/4'' key stock included. OEM-GT Rear Sprocket Mini Bike Go Kart 44 Tooth 40/41/420 Chain. DIMENTIONS: Brand new heavy duty 44T rear sprocket. Mount Hole Distance 2-1/16'' and 2-7/8'' across. OD of sprocket 7-1/4'' and ID is 2''. Material : Steel. INCLUDES: OEM-GT Brand new zinc plated hub used for 4'' and 4.5'' brake drums or rear axle sprockets. Dimensions : 4" Outer Diameter. 1-1/4" Bore with 1/4" keyway & 2 Set Screws. (4) 1/4" Bolt Holes on a 3.228" Bolt Hole Circle. (4) 3/8" Bolt Holes on a 2 -1/8" Bolt Hole Circle and 2-7/8'' across. Mounting hardware and 1/4'' key stock included.