HIGH STRENGTH & LIGHTWEIGHTThe bottom bracket is made of high quality aluminum alloy, lightweight without heaviness to the bike ROBUST & DURABLEBike Chainrings High strength and resistance to deformation, durable for long-term use HIGH PERFORMANCEThe standard tooth design ensures optimal chain storage, increases service life and reduces friction and noise. Increase grip strength, no longer worry about the braided chain, just go through the bumpy road EASY TO INSTALLThis set of connecting rods is easy to install and perfectly matches the bolt pattern of 104mm, 32, teeth on. It has a more compact and simple aspect, and also greatly improves your speed. The bike compartment is an excellent replacement for bike repairs