Shimano SG-7C20 Nexus Sprocket (21T);
Shimano SG-7C20 Nexus Sprocket (21T)

Shimano Alfine and nexus cogs work with either a 1/8 or 3/32 chain. Will also fit any 3 tabbed coaster brake or internally gear hub.

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Shimano Alfine and nexus cogs work with either a 1/8 or 3/32 chain. Will also fit any 3 tabbed coaster brake or internally gear hub.

  • Will also fit any 3 tabbed coaster brake or internally gear hub
  • Will work with either 1/8" or 3/32" chains
  • Shimano Reference Number: SG-7C20
  • Will also fit any 3 tabbed coaster brake or internally gear hub
  • Will work with either 1/8" or 3/32" chains
  • Shimano Reference Number: SG-7C20

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