Features:
The kit includes a 10-speed cassette flywheel, a 104BCD 170mm crank set, a 10-speed chain, a shifter, a rear derailleur, a center shaft and a hanger extender.
It can greatly improve the speed performance of mountain bikes, combining aerodynamics to reduce bike weight and increase riding speed.
Made of high-quality steel and aluminum alloy, it is sturdy and has nice durability, high strength, wear-resistant and impact-resistant, not easy to rust.
It can be used to modify your bike shifting system, perfect as a gift for family, friends, colleagues, cycling enthusiasts, etc.
Easy to install and use, with nice compatibility, smooth running, make riding easier.

Specifications:
Material: Steel + Aluminum Alloy
Flywheel: 10 Speed(11-13-16-20-24-28-32-36-42-50T)
Crank Length: 170mm
Chain Rings BCD: 104mm
Package Size: 260 * 180 * 150mm/ 10.2 * 7.1 * 5.9in
Package Weight: 2015g/ 4.4lb

Packing List:
1 * 10-Speed Cassette Flywheel
1 * 104BCD 170mm Crank Set
1 * 10-Speed Chain
1 * Shifter
1 * Rear Derailleur
1 * Center Shaft
1 * Hanger Extender