Boost front hubs exploded on the scene in 2015/2016 and we needed a way to mount them to our 15mm Fork Mount. Lo and behold, this 15mm round, 10mm wide spacer we made works like a charm. Just insert your skewer through your fork and 15mm fork mount, then slip the spacer in between the far side of your fork and the fork mount before you finish pushing the skewer through and screwing it tight.