e*thirteen Helix Plus 12-Speed 9-50T Cassette - Black Size:9-50 Spider / chainring mount: SRAM

Spider / chainring mount: SRAM Direct Mount

Prevents the removal by thieves for added security

Defined Color: White

Front Derailleur: Shimano Ultegra Di2 FD-R8150

the SLA212 is as strong as it is light and can be used every day

e*thirteen Helix Plus 12-Speed 9-50T Cassette - Black Size:9-50 Spider / chainring mount: SRAMEngineered for E bike durability and cross experience compatible with SRAM, Shimano, and TRP Shifters and Derailleurs of the same gearing count and similar cage capacity. This 9 50T combination is the hot setup for your 12 Speed MTB and allows for a 2 tooth smaller front chainring, shorter chain length, more clearance, and range with our exclusive 9 tooth smallest cog. Future proof your bike, and save weight and cash with the Helix Plus Cassette.