XT MICRO SPLINE 12-speed trail disc wheel system brings high performance technology to a affordable price point These XC wheels are lightweight, strong and durable with a 34.7 mm external UST Tubeless and tubed tyre compatible rim for use with 2.25 - 2.50 inch tyres 28 butted 2.0-1.8-2.0 mm stainless steel spokes Quick engaging Freehub body with pawl engagement every 10 degree giving near instant power transfer Ball bearing races are ground with Cubic Boron Nitride tool for high precision Wide bearing placement gives excellent lateral rigidity further improving strength and durability Forged then anodized alloy hub shell for maximum strength and long lasting good looks The hub uses angular contact bearings designed to cradle the balls giving both radial and lateral support; they also offer precision bearing adjustment and easy maintenance Easy to use Center Lock Disc Rotor mount Double contact seals help keep the elements out and the grease in For use with 12-speed MTB cassette sprockets