Order Includes: 1 x Rear Sprocket. Part Number: 64511-20C21 64511-17C20 64511-20C20 / Specs: Material: C49 High Carbon Steel. Dimensions: Width: 8.6 mm / 0.33" , Inner Diameter: 87 mm / 3.42" , Outer Diameter: 232.7 mm / 9.16" , Circles Diameter: 10.5 mm / 0.41" , Mounting hole Distance: 110 mm / 4.33" , Number of Teeth: 45. We strongly suggest comparing the posted picture to the unit(s) that needs to be replaced..
