40/42T +16T SPROCKET

A larger cassette with 16T & 40T/42T sprockets adopted to upgrade 10-speed system, instead of 15T and 17T; 16T is smoother when shifting. 40T/42T enclosed after 11T-36T cassette is also compatible with Shimano 10 spd drivetrains system, it is easy to install, great durability, and the best ratio in teeth numbers indicated from each sprocket.
16T Spec:
Sprocket material: Chrome Steel
Weight: 23g

40/42T Spec:
Sprocket material: 7075-T6 Sprocket
Weight: 60g (40T). 62g (42T)

Suggest suit for 10-Speed system:
11-13-16-19-21-23-26-30-34-40
11-13-16-19-21-24-28-32-36-42