e*thirteen Helix Plus Cassette - 12-Speed 9-50t Black MFPN=398-00-638 If you are still confused

If you are still confused about the Second Ski Kit please visit our How It Works page for more info

Specifically designed for medium arch feet

a simple push lever releases the cylindrical lens to allow a quick lens swap anytime

Cargo pocket on each side

a must-have accessory for avid anglers conquering their local steelhead rivers

e*thirteen Helix Plus Cassette - 12-Speed 9-50t Black MFPN=398-00-638 If you are still confusedEngineered for E bike durability Work flawlessly with Shimano and SRAM 12sp drivetrains, regardless of different cog spacing and chain behavior Improved reliability of a steel and aluminum assembly Offering a 556% range utilizing an XD driver to enable a 9 50t, 12sp cassette Special note for Hope hub owners: Hope XD drivers do not adhere to the XD specification and require an additional shim. Shims can be acquired from E*Thirteen TECH SPECS model