RD-TY21B-GS 6-Speed Rear Derailleur, Threaded Mount
Fit illustrations show the part and omit branding.
RD-TY21B-GS 6-Speed Rear Derailleur, Threaded Mount
Product highlights
- Six rear speeds — Match the RD-TY21B-GS to a compatible six-sprocket setup and indexed shifter.
- Threaded mount — Check that your frame uses a conventional threaded derailleur hanger.
- Medium cage — Compare the GS medium cage with your current derailleur.
- Sprocket fit — Check for a 14-tooth smallest sprocket and a 28-tooth largest sprocket.
- Color and quantity — Includes one threaded-mount derailleur in your choice of black or silver.
Rear 6 speed. Black or silver. Threaded hanger mount.
Airuzara / Fit & use
Look for a round threaded mount
Check the round mounting point and choose the finish you need.
Rear 6 speed. Black or silver. Threaded hanger mount.
Context illustration
Fit checklist
Check before you order
Where does the mounting bolt go?
It threads into a compatible derailleur hanger on the frame. Compare the mount with your current part before ordering.
Does the mount sit at your rear axle?
If your current silver derailleur has an open axle hook, compare the other mount before ordering.
Compare the silver axle-hook versionFull specifications and box contents
A medium-cage rear derailleur for compatible 6-speed drivetrains, available in black or silver.
Fit and specifications
- Model RD-TY21-B-GS
- Rear speeds 6
- Mount Conventional threaded derailleur hanger
- Cage GS medium cage
- Rear sprocket sizes 14T smallest and 28T largest
Check before you order
- Count six sprockets at the rear wheel and check for a matching indexed shifter.
- Match the conventional threaded hanger to the round mounting bolt shown.
In the box
One RD-TY21B-GS threaded-mount rear derailleur in your selected color.
Related products RD-TY21B-GS axle-hook version