CS-M4100 CASSETTE 11-42

FUNN ZIPPA BASH GUARD features CNC machined 7075 heat treated aluminium back plate, and replaceable thermoplastic polymer bumper that is both strong and light. It will keep your chain ring and chain set safely protected as you zip through rock gardens.

With high quality bearings, a durable finish, and SHIMANO's iconic internal cam quick release, the RS400 is ready for action.

The Shimano Tiagra FC-4703 chainring will give you optimum chain engagement and smooth, precise shifting.