BOLANY Rear Derailleur Hanger Tail Hook Extender Accessory forFree Wheel Teeth
- Can relieve the spring tension of the rear derailleur to enhance the bicycles climbing ability.
- Professional manufacturing for stable performance and high reliability, has long service life.
- Made of high quality aluminium alloy, CNC accuracy machining, strong and durable, easy to install.
- Expanding the flywheel speed yet changes more smoothly, a great accessory for cyclists.
- Suitable for 8‑speed, 9‑speed, 10‑speed, 11‑speed, 12‑speed large flywheel tooth upgrade.
