RD-TY21B-GS 6-Speed Rear Derailleur, Silver Axle Hook
$16.99
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Fit illustrations show the part and omit branding.
RD-TY21B-GS 6-Speed Rear Derailleur, Silver Axle Hook
$16.99
Product highlights
- Six-speed fit — For six rear sprockets with a compatible indexed shifter.
- Axle-hook mount — The open hook seats beneath the rear axle nut. Compare it with your current part.
- Medium cage — The silver GS version uses a medium cage.
- Largest rear sprocket — Check that the largest sprocket has no more than 28 teeth.
- In the box — Includes one silver RD-TY21B-GS rear derailleur with its axle hook.
Rear 6 speed. Silver open axle hook.
Airuzara / Fit & use
Identify the silver axle plate
Check the open mounting plate and the 6-speed specification together.
Rear 6 speed. Silver open axle hook.
Context illustration
Fit checklist
Check before you order
What does an axle-hook mount look like?
Look for an open mounting plate at the rear axle. Compare the outline and position with the part already on your bicycle.
Is there a threaded version?
Choose the threaded model if your current derailleur screws into a frame hanger.
Compare the threaded TY21B-GSFull specifications and box contents
Silver 6-speed rear derailleur with a medium cage and an open rear-axle hook.
Fit and specifications
- Model RD-TY21-B-GS
- Rear speeds 6
- Cage GS medium cage
- Mount Open hook that fits under the rear axle nut
- Largest rear sprocket 28 teeth maximum
- Finish Silver
Check before you order
- Confirm the bike has six rear sprockets and a matching indexed shifter.
- Compare the open axle hook with the mount on your existing derailleur.
In the box
One silver RD-TY21B-GS rear derailleur with axle hook.