e*thirteen Helix Race Cassette - 12-Speed 9-52t Intergalactic

e*thirteen Helix Race Cassette - 12-Speed 9-52t Intergalactic. The e*thriteen Helix Race 12-speed 9-52t cassette is engineered to deliver precision shifting performance with an industry leading 578% gear range. The proprietary 9 tooth smallest cog combined with the 52t largest cog enables the use of a smaller chainring for improved clearance lighter system weight and a lower bail out gear ratio without high gear compromise.

Seamless cross-compatibility with Shimano SRAM and TRP 12-speed drivetrains

Patented 2-Part design provides strength stiffness light weight and ease of service

Aluminum and steel clusters can be replaced separately to reduce service cost

9 tooth high gear allows use of smaller chainrings for clearance and weight savings

Fits XD™ and XDR™ Drivers Only (Hope XD drivers are undersized at the clamp location and require a Cassette Shim Kit -Sold Separately)

Tested extensively for analog and e-bike use