Breaking the Mold with a 29er Bike

The Surly Krampus frameset is your first building block for 29+ trail bike that can go over, off of, or through just about anything in its path.

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.

Features:

• 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″ tires

Specs:

• 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
• Rear Dropout Configuration: Horizontal slotted with optional vertical dumpout
• Rear Hub 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 Hub Spacing: 15 x 110mm (Surly axle included)
• Rear Brake: Disc – 51mm I.S. (203mm max rotor)
• Front Brake: Disc – 51mm I.S. (203mm max rotor)
• Head Tube: ∅44mm
• Steerer Tube: ∅28.6mm (1-1/8″)
• Crown Race: ∅30mm (1-1/8″)
• Stock Headset Upper (S.H.I.S): ZS44/28.6
• Stock Headset Lower (S.H.I.S): EC44/30
• Seat Collar: ∅33.1mm
• Seatpost: ∅30.9mm
• Front Derailleur (Clamp): High direct mount top-pull
• Max Chainring (CL): 1x (Mtn): 28T, 1x (Boost): 30T, 2x (Boost): 24/36T
• Bottom Bracket: 73mm threaded (1.37″ x 24TPI)
• Tire Clearance Frame: 29 x 3.0″
• Tire Clearance – Rigid Fork: 29 x 3.0″
• Rigid Fork Spec: 483 x 47mm
• Max Suspension Fork Length: 550 x 51mm (29+ 120mm)
• Bottle Mounts Frame: 1 Standard + 1 Three-Pack
• Bottle Mounts Fork: 2 Three-Pack
• Rack Mounts Frame: Yes (upper and lower threaded)
• Rack Mounts Fork: Yes (upper, lower, and mid-blade threaded)
• Fender Mounts Frame: Yes
• Internal dropper post routing compatible