The sprockets wear out with use and if your chain is jumping when you turn your wheel, then it is time to replace this part.

While you have the assembly apart for replacement, consider performing the routine maintenance as well by getting the pedestal and break maintenance kits, #Z3410 and #Z2663, related in May We Also Suggest below.

• Length, overall: ~2-5/8"
• Outside diameter: ~1.60"
• Outside diameter, sprocket:~2.41"
• Number of sprocket teeth: 11
• Chain specifications for sprocket: 5/8" #50 chain
• Inside diameter: ~1.003"
• Key details, width & depth: width ~0.251", depth ~0.125"
• Slots, length, overall: 5/8"
• Slots, width: 5/16"
• Set screw specifications: 5/16"-18 flat tip, length 3/8"