The Shimano XTR HB-M9110-B is the flagship XTR front hub built for Boost-spaced mountain bike forks. Running the wider 110x15mm E-THRU axle spacing, it delivers exceptional lateral stiffness and precise steering — ideal for cross-country racers and trail riders building a top-tier custom wheel.

Highlights

• Boost axle spacing: 110x15mm E-THRU axle increases flange width for improved spoke bracing angle and wheel stiffness.
• Centrelock disc mount: Spline-mount rotor interface with included aluminium lockring for secure, precise rotor alignment and consistent braking performance.
• XTR cup-and-cone bearings: Shimano's refined cup and cone bearing surfaces deliver ultra-smooth rotation and are fully field-serviceable for long-term reliability.
• Dual labyrinth and contact seals: Multi-stage sealing system keeps dirt, mud, and moisture out of the bearing races without adding meaningful rolling resistance.
• Lightweight aluminium construction: Machined and anodised aluminium hub shell and axle in XTR's distinctive polished grey finish. 137g hub weight.
• 32-hole J-bend spoke compatibility: Standard J-bend spoke lacing for flexibility in wheel-building with a wide range of rims and spokes.

XTR M9100 Engineering

The HB-M9110-B is part of Shimano's M9100 XTR groupset — the pinnacle of Shimano's mountain bike component range. Every detail of the hub is engineered for race-level performance: refined bearing geometry, widened shell construction for increased torsional rigidity, and cone surfaces machined to tighter tolerances than lower-tier hubs. The result is a hub that rolls faster, handles harder, and lasts longer under demanding trail conditions.

Serviceability

Unlike cartridge-bearing hubs, the XTR cup-and-cone design allows precision adjustment in the field using standard cone wrenches. Cone wrench flats are integrated into the axle ends, and replacement parts are widely available through Shimano's service network, making this hub a long-term investment for serious wheel builders.

Compatibility & Fit

Axle: 15mm E-THRU, 110mm O.L.D. (Boost spacing). Brake mount: Centrelock (IS2000 lockring tool required for installation). Spoke type: J-bend, 32 holes. P.C.D.: 44/44mm. Compatible with Boost-spaced MTB forks with 110x15mm thru-axle. Thru-axle is supplied by the fork manufacturer and is not included. Not compatible with standard 100mm front spacing.