E-Thirteen Helix 12 Speed Race Cluster - XD Driver - Intergalactic - 42-50T - 12 Speed PDP|Option Not compatible with SRAM XD

Not compatible with SRAM XD 11-speed cassettes

Installs quickly and securely to your seat post and stem to adapt a wide range of bikes for transport

Built-in fast recharging circuit

is incredibly precise and keeps the unwanted noise of chain slap to a minimum

E-Thirteen Helix 12 Speed Race Cluster - XD Driver - Intergalactic - 42-50T - 12 Speed PDP|Option Not compatible with SRAM XDUnlike SRAM Eagle, Helix R cassettes have replaceable gear clusters. That means ongoing service and replacement costs will be less than half that of SRAM cassettes. As an added bonus, Helix R 12s clusters are backward compatible with and can be used to upgrade your existing TRS+ 9 50 cassette. When installing the Helix R cassette, as with any cassette, it's recommended to check for chain wear. If your chain shows 0. 5% or more wear, you will