The ultimate in reliable lightweight hubs from the ultimate Shimano MTB groupset, XTR Disc hubs are engineered to perform in the most demanding conditions Designed for 15 mm bolt thru axle forks with 110 mm O.L.D. Easy to use Centre-Lock Disc rotor mount for secure hassle free setup Double contact seals with internal grease sleeve to keep the elements out & the grease in, extending service life & maintain smooth operations even in the toughest terrain The hub uses angular contact bearings designed to cradle the balls giving both radial & lateral support for superior strength & durability in real world riding conditions; they also offer precision bearing adjustment & easy maintenance Wide bearing placement gives excellent lateral rigidity further improving strength & durability Forged then anodized alloy hub shell for maximum strength & long lasting good looks Lightweight, strong & ridged hybrid alloy axle with integrated cone Ball bearing races are ground with Cubic Boron Nitride tool for high precision, durability & smooth rolling Stainless steel bearings Average weight 155 grams