Surly Krampus Frameset - 29" Steel Chester Copperpot Small. The Krampus is the bike that started it all — the plus-size movement that is. For 2017 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.

100% Surly 4130 CroMoly steel frame and fork; double-butted main triangle and 44mm headtube

New tube-set uses the same trumpet tubes found on 2017 Karate Monkey frame

Gnot-Boost adjustable rear dropouts

Internal dropper seatpost routing

30.9mm seat tube

Designed to fit up to 29 x 3.0” tires