Deal! Series

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 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.