Welcome to the all new Helix R 12 speed 13-52t close ratio cassette 🔥 Most mountain bike riders spend at least 70% of their time climbing or traversing, not utilizing the smallest cogs of the cassette. We’ve moved those wasted gears to the big cogs, giving you smaller gear steps starting at the 25T cog all the way through to the 52T. With this gearing, you can optimize cadence for e-bikes and bio-bikes alike. While the Helix Race 13-52T was conceived with e-bikes in mind, it can improve the rid