The rear derailleur extension converter of the frame is tailor-made to match the 11-40 11-42 11-46T flywheel. When you change the gear when the maximum gear wheel rubs against the number of teeth of the large flywheel, or when the gear is less than the maximum gear, You only need to add a rear dial converter to the original rear dial hook to easily solve your troubles!
Suitable for 40T 42T 46T flywheel installation instead of extended support screws, ,, to make the expansion flywheel more smoothly, mountain bike, road bike big flywheel modification artifact
Name: Rear derailleur extension tail hook
Color: black, red, blue
Size: as shown
Material: ultra-light high-quality aluminum alloy
1*Bicycle extension tail hook