WH-M9000 XTR Race Carbon laminate wheel, designed to meet the pro criteria These race wheels are lightweight, strong & durable with a tubeless compatible carbon laminate 23.9mm rims 28 butted 2.0-1.5-2.0 mm stainless steel spokes Ball bearing races are ground with Cubic Boron Nitride tool for high precision Wide bearing placement gives excellent lateral rigidity further improving strength & durability Forged then anodized alloy hub shell for maximum strength & long lasting good looks The hub uses angular contact bearings designed to cradle the balls giving both radial & lateral support; they also offer precision bearing adjustment & easy maintenance Easy to use Centre-Lock Disc Rotor mount Weight is kept down by using a hybrid one piece aluminium axle / cone Double contact seals with internal grease sleeve to keep the elements out & the grease in Designed for 15 mm bolt thru axle forks with 100 mm O.L.D. Average weight 739 grams