Easy to install and use, with nice compatibility, smooth running, make riding easier. 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. 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. It can be used to modify your bike shifting system, perfect as a gift for family, friends, colleagues, cycling enthusiasts, etc.
