The e*thirteen Helix Race 12-speed 13-52t cassette features close ratio gearing, specifically engineered for steep terrain where climbing time and shift frequency is high, and descents are gravity driven. By placing more gears where riders spend the majority of the time, they can optimize cadence and torque for improved climbing efficiency with smoother shifts under load for both analog and eBikes.

• Close ratio gearing cassette for improved shifts under load
• Lower fatigue and extended range (Bio or Battery) with sweet spot cadence for maximum efficiency
• Seamless cross-compatibility with Shimano, SRAM, and TRP 12-speed drivetrains
• Patented 2-Part design provides strength, stiffness, light weight, and ease of service
• Tested extensively for analog and e-bike use
• Fits XD™ and XDR™ Drivers Only
• Color: Gray
• Cassette Body Type: SRAM XD 11/12 Speed , SRAM XDR
• Designed for ebike: Yes
• Drivetrain Speeds: 12
• Defined Color: Gray , Silver
• Cassette Cogs: 13-15-17-19-22-25-28-32-36-40-45-52
• Weight: 467
• Range: 13-52