Rear Wheel Internal Derailleur Freewheel 21T For 1/8 And 3/32 Chains Compatible With Shimano Nexus And Alfine Internal Gear Hubs Fits Coaster Brake And Internally Geared Hubs Smooth Shifting And No Fuss Reliability

21T Rear Freewheel for 1/8 or 3/32 Chains, 90mm OD
✔️ 21T freewheel, 90mm OD, bore 34.5mm, 2.3mm thick, black (1x)

This rear wheel freewheel is designed for bikes with internal gear hubs and is commonly used on city bikes and commuters for reliable shifting and backward braking.

✅ 21 teeth for smooth engagement
✅ Outer diameter 90mm
✅ Bore diameter 34.5mm
✅ Thickness 2.3mm
✅ Black metal construction
✅ Compatible with Shimano Nexus and Alfine internal gear hubs
✅ For 1/8 and 3/32 inch chains

💡 What is a rear wheel freewheel used for in internal gear hub setups?

Its purpose is to transfer pedal power smoothly and enable backward braking in geared hubs.

- Smooth engagement with Nexus and Alfine hubs - Compatible with 1/8 and 3/32 inch chains - 21T gearing for stable shifts - Durable metal construction for long life