XX1 X-glide 11 Speed Cassette :FIRST OF ITS KIND :Ranging from 10- to 42-teeth, the 11-speed X-DOME delivers an incredibly wide gear range while maintaining even, optimized steps. The single-unit cassette combines with the XD driver body for a superior connection to the wheel..,11-speeds (10-12-14-16-18-21-24-28-32-36-42)Bearing design and ratchet mechanism steadied by XD driver bodyCreates more stable hub connectionGear steps optimized across entire rangeXD driver body is 6-8g lighterWeight: 260 grams.,