The Krampus is the bike that started it all -- the plus-size movement that is. The Krampus features Surly's Gnot-Boost rear hub spacing of 145mm; compatible with Boost 148 x 12mm thru-axle, 142 x 12mm thru-axle and 135mm quick-release hubs. Rolling on 29" x 3" tires, this bike can roll over just about anything you can point it at. - 100% Surly Chromoly steel frame and fork; double-butted main triangle and 44mm headtube - Gnot-Boost adjustable rear dropouts - Internal dropper seatpost routing - 30.9mm seat tube - Designed to fit up to 29 x 3.0" tires