The E Thirteen (E13) Helix Race cassette offers some of the largest gear ratios on the market. In its 9-50 and 9-52 tooth versions, it features an exclusive 9-tooth sprocket that, combined with a two-piece construction, provides a wide range of ratios depending on whether you prefer to climb with power or cadence.
The 13-52 tooth version, developed for Ebike use but also adopted by traditional MTB riders, optimizes pedaling cadence on climbs while reducing the gap between each sprocket. Say goodbye to the feeling of never being in the right gear—although on descents, you'll have to let gravity do its job!
The 9-45 tooth version is developed for Gravel and XC use and is compatible with Sram 12 speed systems including XPLR and Flat Top chains
Key features of the Helix Race cassette
One of the widest gear ranges on the market (up to 578%)
Compatible with Sram, Shimano, and TRP drivetrains
Precision-machined two-piece design for easy installation and maintenance while minimizing power loss
Steel and aluminum sprockets can be replaced separately
The 43-52 and 42-50 sprocket blocks are interchangeable
The use of a small 9-tooth sprocket allows for a smaller chainring, making technical sections easier while reducing weight and bulk
Available in multiple anodized colors
Compatible with both E-Bikes and traditional MTBs
Specifications
Compatibility: 12-speed Sram, including AXS, Shimano, and TRP derailleurs and shifters
Not compatible with Sram T-Type drivetrains
9-45 version compatible with Flat-Top chains and XPLR derailleurs
Compatible freehub bodies: XD and XDR
For Hope XD freehub bodies, a specific spacer is required
Materials: Top 2 sprockets made of aluminum, remaining 10 sprockets made of steel
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