SURLY Krampus Frameset 29+ Adventure - Butted 4130 Cr-Mo inc Forks, Gnot Boost spacing 2025

Breaking the Mould with a 29er Bike

As the first 'plus' bike to hit the market, Krampus changed the way many people approach trail riding. It's shown people the light of how high volume, large diameter tyres can vastly improve the ride experience. It's also done a bang-up job dispelling the myth that big tires make you slow.

Krampus is kind of like the opposite of a mullet: long in the front and short in the rear. With a long toptube and compact chainstays, it takes trail-shredding abilities to the next level. A mullet may be business in the front, party in the back, but Krampus makes partying its business.

"Lean back, hang on, and ride that wild horse." - Thor

• Modern trail standards: dropper post compatibility, 44mm headtube, Gnot-Boost rear spacing, thru-axles, suspension-corrected fork
• Compatibility with most mountain bike standards makes it the perfect parts bin bike (no rim brakes allowed though)
• Clearance for 29" x 3" tyres

• Tyre Size: 29 x 3.0"
• Frame Construction: 4130 Chromoly, Natch tubing, double-butted main triangle, trumpet flared tubes, TIG welded, ED coated
• Fork Construction: 4130 Chromoly, Natch tubing, double-butted tapered fork blades, TIG welded, ED coated
• Suspension Fork Length (Travel): Max. Suspension fork length: 550 x 51mm (29+ 120mm)
• Rigid Fork Length: 483mm
• Fork Offset: 47mm
• Axle to Crown: 483mm
• Rear Spacing: "Gnot-Boost" 145mm; 12 x 142mm or 12 x 148mm (Surly axle included) / 10 x 135mm with Surly 10/12 Adapter Washers (not included)
• Front Brake (Rotor): Disc - 51mm I.S. (203mm max rotor)
• Headset - Upper: ZS44/28.6
• Headset - Lower: EC44/30
• Front Spacing: 15 x 110mm
• Steerer Tube: Ø28.6mm (1-1/8")
• Crown Race: Ø30mm (1-1/8")
• Stem Clamp: Ø28.6mm (1-1/8")
• Seatpost: Ø30.9mm
• Dropper Post Compatible: Yes
• Seatpost Clamp: Ø33.1mm
• Front Derailleur Clamp: Ø34.9mm)
• Front Derailleur Type: High direct mount top-pull (Ø34.9mm); 26mm offset adapter (not included) for 142 or 135mm rear hub spacing; 29mm offset adapter (not included) for 148mm rear hub spacing
• Bottom Bracket: 73mm threaded (1.37" x 24TPI)
• Crankset (Max Ring): 1x (Mtn): 28T / 1x (Boost): 30T / 2x (Boost): 24/36T
• Bottle Mounts: 1 Standard + 1 Three-Pack
• Rear Mudguard Mounts: Yes