e*thirteen has revolutionized the world of drivetrains by introducing the original 9-50T Helix Race Cassette, boasting an impressive 533% gear range. This breakthrough innovation features our exclusive 9-tooth sprocket and a patented two-piece design, granting riders unprecedented flexibility in tailoring their ideal drivetrain.Features- Cross compatibility with Shimano, SRAM, and TRP drivetrains and chains- 2-piece forged/machined design provides ease of assembly/service and reduces waste- 43-52t aluminum cluster backward compatible with 9-50T Helix Plus or Race cassettes- Unique 9T high gear allows use of smaller chainrings for clearance and weight savings- Tested extensively for analog and e-bike use

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