The e*thriteen Helix Race 12-speed 9-52t cassette is engineered to deliver precision shifting performance with an industry leading 578% gear range. The proprietary 9 tooth smallest cog combined with the 52t largest cog enables the use of a smaller chainring for improved clearance, lighter system weight and a lower bail out gear ratio without high gear compromise.

• Seamless cross-compatibility with Shimano, SRAM, and TRP 12-speed drivetrains
• Patented 2-Part design provides strength, stiffness, light weight, and ease of service
• Aluminum and steel clusters can be replaced separately to reduce service cost
• 9 tooth high gear allows use of smaller chainrings for clearance and weight savings
• Fits XD and XDR Drivers Only (Hope XD drivers are undersized at the clamp location and require a Cassette Shim Kit -Sold Separately)
• Tested extensively for analog and e-bike use
• Cassette Body Type: SRAM XD 11/12 Speed
• Cassette Body Type: SRAM XDR
• Cassette Cogs: 9-11-13-15-17-20-23-27-31-36-43-52
• Color: Bronze
• Defined Color: Brown
• Defined Color: Silver
• Designed for ebike: Yes
• Drivetrain Speeds: 12
• Range: 9-52
• Weight: 392