Will a Fat Bike fit a HighSpeed? Dave Updated January 24, 2020 15:33 Follow Yes, the HighSpeed - Fits up to 5". It also fit most Thru Axles out of the box Other mounts that will work are; ForKChop - Fits up to 5", also fits most Thru Axles out of the box HighRoad will fit a tire up to to a 3.25" Related articles What size Axles will the HighSpeed Fit? HighSpeed Replacement Parts U.S. Customer Support Wheel and Tire Size Compatibility Comments 0 comments Please sign in to leave a comment.