Keep your existing 15x100mm front wheel as you upgrade to a new Boost 15x110mm fork Kit consists of two precisely machined end caps and a rotor spacer (and requisite bolts), and it requires no dishing Not compatible with QR or 20mm hubs, hubs with threaded end caps, nor are they compatible with those featuring a Shimano Center Lock brake mount. Kits are not suitable for use with RockShox RS1. 185mm max rotor size