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Krampus

Krampus

⚠️ WARNING: This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

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Krampus is the evolution of the 29er. It’s not a fat bike. True, its got 3” tires on 50mm rims (we call this combination “29+”). But where fat bikes are really designed for slow-speed crawling, Krampus’s frame (geometry, tubing diameter/thickness) has been designed with a long toptube and as short a rear end as we could get away with given the wheel/tire size. This, when combined with the big, wide tires, results in a mad amount of rolling inertia and grip. It rips and responds well to body English. The big tires also offer a bit of suspension-like cushion. Krampus is a trail bike that also tackles all kinds of terrain. Krampus lives somewhere between bushwhacking, speed racing, and back lot dirt track riding, and all this makes it just plain fun to ride.

Krampus’s hub spacing is standard 100mm front and 135mm rear, with rear-loading horizontal dropouts that accommodate a derailleur and single ring/cog drivetrains. It’s got clearance for disc rotors up to 185mm and is designed to run a high direct mount standard front derailleur. This type of derailleur will allow the most clearance at the tire. Even though there is no need for the sort of frame offset you find on our Pugsley and Moonlander models, chain and derailleur clearance at the tire remains a serious consideration. If you plan to use standard width rims and tires, you’ll be able to run a normal mountain triple crank. However, if you go with our 50mm Rabbit Hole rims and 3˝ Knard tires (and why wouldn’t you?) then plan to use a 1x or 2x crank…a triple simply won’t clear the tire. For best chain/tire clearance, we recommend either a Surly O.D. 2x crank or a 1x system. Other brands’ 2x cranks will work but may cause some chain-on-tire rub in the easiest gear combo.

Got all that? O.K., then. Give it the juice and hang on.

Specifications

Geometry

Geometry Diagram
SIZE Small (15) Medium (17) Large (19) xLarge (21)
Reach 399.0 421.6 441.1 451.7
Stack 589.8 594.5 599.2 613.2
Head Tube Angle 69.5° 69.5° 69.5° 69.5°
Head Tube Length 90.0 95.0 100.0 115.0
Seat Tube Length 375.0 425.0 475.5 525.0
BB Drop 60.0 60.0 60.0 60.0
Wheelbase 1091.1 1116.7 1138.8 1155.3
Chainstay Length 446.0 446.0 446.0 446.0
Top Tube Length, Actual 561.0 578.0 597.4 614.7
Top Tube Length, Effective 585.0 609.0 630.0 645.0
Seat Tube Angle 72.5° 72.5° 72.5° 72.5°
Standover Height 773.4 799.7 825.8 856.6
Fork Length 483.0 483.0 483.0 483.0
Fork Rake 47 47 47 47

All dimensions are preliminary and subject to change *1 St angle is the effective ST angle. *2 Standover is measured from the top of the TT, at the center, with a tire measuring approximately Ø775mm

Frame Specs

  • Tubing: Surly 4130 CroMoly steel. Main Triangle TIG-welded, custom butted. Sweet CS Yoke. ED coated.
  • Rear Dropouts: Horizontal slotted w/derailleur hanger, 135mm O.L.D.
  • Brake Compatibility: 51mm IS disc mounts frame and fork
  • Braze-ons/extras: Dual water bottle mounts, Surly Trip Guide full line guides for brake and derailleurs, fender eyelets
  • Seatpost Diameter: 27.2mm
  • Seatpost Clamp Diameter: 30.0mm
  • Headset/Steerer Tube: 44mm ID. Recommend EC44 lower cups. Zero Stack on top is OK.
  • Front Derailleur Clamp Diameter: 31.8mm, high direct mount standard, clamp adapter included
  • Bottom Bracket Shell: 73mm shell width, threaded standard English (1.37" x 24t)
  • Chainring Clearance: Triple 22/34/44t, Double 26/39t, Max single ring clearance, Middle position, 34t. Outer position 44t. (Triple will not work with Surly 50mm rim and 29 x 3" tire, for doubles, run a Surly O.D. Crankset for best tire clearance.)
  • Tire Clearance: 29 x 3.0"
  • Fork: TIG-welded custom tapered butted 4130 CroMoly, 100–120mm suspension corrected, 1-1/8˝ steerer tube, 203mm disc brake clearance
  • Thru Axle: HU0138 Surly 15x110 Front Thru Axle. HU0134 Surly 12x142/148 Rear Thru Axle
  • Colors: Moonlit Swamp