While you are riding into the Downhill and would like seek down in fast, SCROLL can
in place of Sprocket from 10 speed to 7 speed, since lightweight design can reduce
heavy wear on the sprocket. It’s made by CNC machined with anodized process bring
it stiffness and strengthen, SCROLL is a great assistance to make your bike get rid of complicated shifts and have more responsive shift system left. The design is not only for mountain bikes but also good for road bikes when you pursuit speed.