E-Thirteen Helix 12 Speed Race Cluster - XD Driver - Intergalactic - 42-50T - 12 Speed PDP|Option 360-degree ventilation

360-degree ventilation

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

all-kinds-of-trail champion packing a heavyweight value

Built-in fast recharging circuit

Not compatible with SRAM XD 11-speed cassettes

E-Thirteen Helix 12 Speed Race Cluster - XD Driver - Intergalactic - 42-50T - 12 Speed PDP|Option 360-degree ventilationUnlike 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