6mm - 188 x 88mm (at the longest and widest points)

meaning less force is required to get it moving

They're also a double pane lens that drastically helps with fogging

Featuring a perforated

Who's it for: Riders on e-bikes

E-Thirteen Helix 12 Speed Race Cluster - XD Driver - Naranja - 42-50T - 12 Speed Images Uploaded - Ready for Review 6mm - 188 x 88mmUnlike 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