Quick Summary
The ZZRSDAN Bicycle Coaster Brake Hub 21T Sprocket Kit is a bicycle hub kit with a 21T sprocket reference in the name. The product details also list a coaster brake hub, stainless steel material, a rear width of 110 mm, and an axle length of 165 mm.
Key Details
| Detail | Product information and buyer relevance |
|---|---|
| Product type | Bicycle coaster brake hub kit. Confirm it matches the part you need. |
| Brand | ZZRSDAN. Useful for matching the exact product. |
| Sprocket reference | 21T. Check that this matches your intended setup. |
| Rear width | 110 mm. Compare this measurement with your bike’s rear spacing. |
| Axle length | 165 mm. Check this against the fit requirements for your build. |
| Material | Stainless steel. A relevant detail when comparing construction between options. |
| Rear hub diameter | 38 mm. Confirm this works with your intended adapter or setup. |
| Adapter note | Works with a 1.5 inch adapter. Check that this matches the parts you already have. |
| Included items | 1 coaster brake hub and an accessory set that includes 18 tooth slices, screws, and gasket items. |
What to Compare Before Buying
- Rear spacing: This hub is listed at 110 mm, so match that to the bike’s rear spacing before choosing it.
- Axle length: The stated 165 mm axle length should be checked against your setup requirements.
- Sprocket and adapter fit: Compare the 21T sprocket reference, 38 mm rear hub diameter, and 1.5 inch adapter note with the parts you plan to use.
- Included parts: The accessory set includes 18 tooth slices, screws, and gasket items, so confirm those contents fit your repair or replacement plan.
What Is Included
- 1 coaster brake hub
- 1 accessory set with 18 tooth slices, screws, gasket items, and related parts
Before You Decide
Confirm the 110 mm rear width, 165 mm axle length, 38 mm rear hub diameter, and 1.5 inch adapter note before choosing this hub kit. Make sure the included parts match the repair or replacement you are planning.
Coaster Brake Setup
A coaster brake is operated by pedaling backward. Before choosing a replacement hub, check that your bike is configured for a coaster-brake hub and that the hub, sprocket, and chain work with your wheel and drivetrain. The listed dimensions are useful starting points, but do not establish compatibility on their own.











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