ethirteen Helix Race 12-Speed 9-50T Cassette
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ethirteen Helix Race 12-Speed 9-50T Cassette Info
e*thirteen Helix Race 12-Speed 9–50T Cassette delivers massive range in a lighter, smarter package for modern 1x drivetrains. With an industry-leading 556% gear range and a 9-tooth small cog, this cassette lets riders downsize their chainring without sacrificing top-end speed—improving ground clearance, reducing weight, and enhancing overall ride performance.
Designed as a true upgrade for 12-speed SRAM™, Shimano™, and TRP® shifting systems, the Helix Race cassette mounts on an XD driver and provides crisp, reliable shifting without compromise. The 9T cog opens up gearing options that simply aren’t possible with traditional 10T-based cassettes, allowing riders to run a 2-tooth smaller chainring for added clearance and a lighter drivetrain—benefits that are especially noticeable on technical terrain.
A lightweight two-piece construction keeps total weight low while allowing key aluminum cogs to be replaced as they wear, extending service life. The cassette is also e*spec-rated for e-bike use, ensuring durability under higher torque loads. By reducing unsprung rear-wheel weight, the Helix Race cassette helps suspension react more effectively, improving traction, control, and handling on demanding trails.
e*thirteen Helix Race 12-Speed 9–50T Cassette Specs at a Glance
- Speed: 12-speed.
- Gear Range: 9–50T (556%).
- Weight: Approx. 384g.
- Driver Body: XD only.
- Compatibility: SRAM®, Shimano®, and TRP® 12-speed shifters and derailleurs with similar cage capacity.
- Construction: Two-piece design with replaceable aluminum cogs.
- E-Bike Rated: Yes (e*spec).
Design Benefits
- More Range, Less Weight: 556% gearing in a lightweight package.
- Smarter Gearing: 9T cog allows smaller chainrings for clearance and efficiency.
- Improved Ride Quality: Reduced unsprung mass enhances suspension performance.
Final Take
The e*thirteen Helix Race 12-Speed 9–50T Cassette is a standout option for riders who want maximum range without added weight. With innovative gearing, excellent shift performance, and serviceable construction, it’s a high-performance drivetrain upgrade for trail, enduro, and e-MTB riders alike.
