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.PVD finish for improved durabilitySeamless cross-compatibility with Shimano, SRAM, and TRP 12-speed drivetrainsPatented 2-Part design provides strength, stiffness, light weight, and ease of serviceAluminum and steel clusters can be replaced separately to reduce service cost9 tooth high gear allows use of smaller chainrings for clearance and weight savingsFits 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 useItem SpecificationsCassette Body TypeSRAM XDCassette Body TypeSRAM XDRCogs9-11-13-15-17-20-23-27-31-36-43-52ColorIntergalacticDefined ColorBlueDefined ColorSilverDesigned for ebikeYesDrivetrain Speeds12Range9-52Weight392 e*thirteen Helix Race 12-Speed 9-52t Cassette Cassettes EAN: 4711280341542