Shimano Deore XT FH-M8120-B Rear Hub Reliability and Performance The Shimano Deore XT FH-M8210-B Rear Hub offers improved reliability and performance through improved seal design and steel cartridge bearings with pre-load adjust, creating an easily serviceable and smooth-rolling rear hub. Lighter weight with improved engagement (max 3. 5deg), FH-M8210-B is available in 12x148 boost spacing and traditional 28H/32H drilled options. Features Quicker engagement with a 3. 5deg engagement angle Smart seal design and smooth bearings mean less drag when coasting Available in both 28H and 32H drilling options SPECIFICATIONSHub Size12x148mm Spoke Interface-Hub Drilling28H, 32HBrake Type Centerlock Cassette Compatibility Microspline | Shimano | Deore Xt Fh-M8210-B Rear Hub 12X148Mm, 28 Hole, Centerlock, Microspline