Specialized Formula-Roval 148mm boost rear hub fix for Levo/ Kenevo/Enduro/Stumpjumper/Epic/etc.

Specialized Formula-Roval 148mm boost rear hub from Levo/ Kenevo/Enduro/Stumpjumper/Epic/etc. bikes, have a design “flaw“ that allows axial loads to be applied on the hub’s 2 radial bearings( original ones XERO 6903 LBLU which i replaced with a pair of NTN 6903 LLU) when the axle is tightened. Inspired by a mod that someone did, that i read about on a bike forum, i decided to create my own simple mod which consist of a 53mm wide, 17mm inner diameter and 21.5 mm outer diameter aluminium tube/sleeve inserted in between the 2 radial bearings which in turn eliminates the axial load by limiting the movement of the inner races towards each other when tightening the axle bolts. Hope this can help other riders that have this hub and prevent the bearings from prematurely failing( off course this does not exempt good maintenance of the rear hubs which means cleaning and lubricating them periodically, avoiding power washing, etc.).