The Krampus frame is constructed using the same custom -designed, frame -specific, Surly CroMoly “’Natch” steel tubes found on many of our other trail bikes. The main triangle’s tubes are internally butted with some tubes externally tapered, flared like a trumpet and ovalized to add stiffness and strength without adding weight. When you add in the 3” tires, it makes for a resilient and lively ride that’s durable and fun as hell. If you’re looking to ride through/over/off of obstacles, may the Krampus be your mighty steed. As Thor puts it: “Lean back, hang on, and ride that wild horse.” Tubing - Surly 4130 CroMoly steel. Custom double -butted trumpet tube main triangle. TIG -welded. ED coated. Rear Dropouts - 12mm horizontal and vertical slotted with derailleur hanger and Surly “Gnot -Boost” 135, 142, and/or 148mm hub spacing compatibility Brake Compatibility - 51mm I.S. disc caliper mounts, 180mm max rotor size Braze-ons/extras - Two down tube bottle -mounts on all sizes (SM -XL), no seat tube bosses Seatpost - 30.9mm Seatpost clamp - 33.1mm (Surly Stainless included) Headtube - 44mm Front Derailleur Clamp - 34.9mm, high direct -mount (not included) Bottom bracket - 73mm Englich Threaded Chainring Clearance - 30t Boost 1x, 24/36t Boost 2x Tire Clearance - 29 x 3.0" Fork - 15mm Thru -Axle, 1 -1/8˝ steerer tube, 203mm disc brake clearance and 29 x 3.0" tyre clearance Thru Axle - HU0138 Surly 15x110 and 12x142/148 Thru Axles (included)
