E-Thirteen Helix Race 12-Speed 13-52T Sprockets

E-Thirteen Helix Race 12-Speed 13-52T sprockets, for MTB and Gravel, gray. 

At e*thirteen, we always strive to bring something new to the table. That's why we created the Helix line of cassettes: to offer unmatched cross-compatibility without sacrificing performance.

As electric bikes have become more popular, we set out to design a close ratio cassette specifically for them. Enter the Helix Race 13-52T: a new 12-speed close ratio cassette, designed specifically for steep terrain where climbing speeds are high and descents are done by gravity.

The 13T, in combination with a 32T chainring, at a cadence of 85 rpm, will offer speeds of 32 kmph/20 mph or just over, which is a little beyond the limited speed assistance of most e-bikes . The new 52T lower gear and closer steps help riders tackle the most technical climbs with new ease.

While the Helix R 13-52T was conceived with e-bikes in mind, it also improves the riding experience for non-e-bike riders, allowing them to optimize their cadence on steep climbs and let gravity do the work on descents.

Like all e*thirteen Helix cassettes, the Helix Race 13/52t offers perfect cross-compatibility with SRAM, Shimano and TRP 12 drivetrains, as well as increased shifting accuracy and life. Weighing 467g, the gears are reinforced for high-powered e-bikes, but are light enough for weight-optimized trail bikes.

Experience the benefits of a close ratio cassette on your next ride with the Helix R 13-52T.

• Close ratio gear cassette for better cadence and improved shifting under load
• Reduced fatigue and extended range (Bio or Battery) with optimal cadence for maximum 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 groups can be replaced separately to reduce service cost.
• Patented two-piece aluminum/steel construction for strength, rigidity, light weight and durability.
• Reinforced for e*spec strength: 467g weight
• 5 bold anodized or PVD color options
• Extensively tested for use on analogue and electric bicycles