Price: $345.95
(as of Feb 23, 2025 08:01:39 UTC – Details)

Helix R 12s 13-52T Cassettes are a new close-ratio gearing design, engineered specifically to optimize cadence and shift performance under load in steep terrain with frequent climbs and gravity-powered descents. While the close-ratio concept was conceived as a game changer for e-bikes and built exceptionally strong, it’s equally at home on mountain bikes and weighs in at an impressive 467g. Offering unparalleled cross-compatibility with all Shimano, Sram, and TRP 12 drivetrains, it features e*thirteen’s patented 2pc construction for ease of assembly and service.
Optimize cadence and shifts under loads in steep terrain, with a Helix R 13-52T close ratio gearing cassette upgrade for your e-bike or MTB.
Close ratio gearing cassette for optimized cadence and improved shifting under load
Lower fatigue and extended range (Bio or Battery) with sweet spot cadence for max efficiency
Helix R 13-15-17-19-22-25-28-32-36-40-45-52 vs Eagle 10-12-14-16-18-21-24-28-32-38-44-52
Cross-compatibility with Shimano, SRAM, and TRP drivetrains and chains
Aluminum and Steel clusters can be replaced separately to reduce service cost
Patented two-piece aluminum/steel construction for strength, stiffness, light weight, and durability
Specs: XD Driver, 13-52T, 12 spd, 10 Steel / 2 Alloy Cogs, Shimano/Sram/Trp 12sp, 400% Range, 7075 AL / Steel
Weight: 467g