Quick Summary
The RD-TY21B rear derailleur is a black replacement part for 6 and 7 speed bikes. It is described as direct mount compatible and also as a universal replacement for mountain, commuter and cruiser bikes.
For buyers, the main checks are speed count, mounting style and whether the part matches the bike setup already in use.
Key Details
| Detail | Product information and buyer relevance |
|---|---|
| Model | RD-TY21B, which helps confirm the exact replacement part. |
| Product type | Rear derailleur for bicycle drivetrain replacement. |
| Speed count | 6/7 speed support, so the bike should match that setup. |
| Mounting | Direct mount compatible, and also described as compatible with traditional derailleur hangers. |
| Color | Black. |
What to Compare Before Buying
- Speed count: Compare the bike’s 6 or 7 speed setup with this derailleur’s stated compatibility.
- Mounting style: Check whether the bike uses direct mount or a traditional derailleur hanger.
- Replacement match: Confirm the RD-TY21B model matches the part you are replacing.
- Bike type: The part is presented for mountain, commuter and cruiser bikes, so compare it with the bike you plan to service.
Choosing the Correct Version
The main version check is the speed count and mounting style. Make sure the bike is set up for 6 or 7 speeds and that the mounting point matches the frame or hanger arrangement before choosing an offer.
Before You Decide
Confirm the RD-TY21B model, the 6 or 7 speed setup, and the mounting style on your bike. If the frame or hanger arrangement does not match, choose a different rear derailleur.
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