Maintain optimal cadence on steep terrain with the e*thirteen Helix Race 13-52T 12-speed cassette. Designed for e-bikes and traditional MTBs, this close-ratio upgrade improves climbing efficiency and works seamlessly with SRAM, Shimano, and TRP drivetrains. The patented two-piece aluminum and steel construction mounts exclusively to XD drivers, offering maximum strength for gravity-powered descents.