Ethirteen Helix Sram XD Cassette 12s 13-52T

A close-ratio cassette specifically for e-bikes. Enter the Helix Race 13-52T - a new 12-speed close-ratio cassette, specifically engineered for steep terrain where climbing speeds are high, and descents are gravity-powered. The 13T, in combination with a 32T chainring, at 85rpm cadence, will deliver speeds at or just above 32kmph/20mph, which is just beyond the speed-limited assistance of most e-bikes. The new 52T lowest gear and closer steps help riders clean the most technical climbs with newfound ease. While the Helix R 13-52T was conceived with e-bikes in mind, it improves the ride experience for non-e-bike riders, too, allowing them to optimize their cadence on steep climbs and let gravity do the work on descents. Like all e*thirteen Helix cassettes, the Helix Race 13/52t delivers seamless cross-compatibility with SRAM, Shimano, and TRP 12s drivetrains, as well as improved shifting precision and wear life. Weighing in at 467g, the cogs are reinforced for high-powered e-bikes, yet light enough for weight-optimized trail bikes. Experience the advantages of a close-ratio cassette on your next ride, with the Helix R 13-52T. Close ratio gearing cassette for better cadence and improved shifts under load Lower fatigue and extended range (Bio or Battery) with sweet spot cadence for max efficiency Helix R 13-15-17-19-22-25-28-32-36-40-45-52 vs Eagle™ 10-12-14-16-18-21-24-28-32-38-44-52 Cross-compatibility with Shimano, SRAM, and TRP drivetrains and chains Aluminum and Steel clusters can be replaced separately to reduce service cost Patented two-piece aluminum/steel construction for strength, stiffness, light weight, and durability Reinforced for e*spec strength - 467g weight 5 bold anodized or PVD color options Tested extensively for analog and e-bike use PRODUCT SPEC Freehub Mount XD™ and XDR™ Drivers Only Material 2 aluminum cogs, 10 steel cogs. PVD finishing on Intergalactic model improves durability and wear life. Size 13-52T: 13, 15, 17, 19, 22, 25, 28, 32, 36, 40, 45, 52 Speeds 12 Speed Weight 467g