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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

Krampus 2017 Geo
units:

Select a few bike sizes to compare.

SIZE Small (15) Medium (17) Large (19) xLarge (21)
Reach 15.7 399.0 16.6 421.6 17.4 441.1 17.8 451.7
Stack 23.2 589.8 23.4 594.5 23.6 599.2 24.1 613.2
Head Tube Angle 69.5° 69.5° 69.5° 69.5°
Head Tube Length 3.5 90.0 3.7 95.0 3.9 100.0 4.5 115.0
Seat Tube Length 14.8 375.0 16.7 425.0 18.7 475.5 20.7 525.0
BB Drop 2.4 60.0 2.4 60.0 2.4 60.0 2.4 60.0
Wheelbase 43.0 1091.1 44.0 1116.7 44.8 1138.8 45.5 1155.3
Chainstay Length 17.6 446.0 17.6 446.0 17.6 446.0 17.6 446.0
Top Tube Length, Actual 22.1 561.0 22.8 578.0 23.5 597.4 24.2 614.7
Top Tube Length, Effective 23.0 585.0 24.0 609.0 24.8 630.0 25.4 645.0
Seat Tube Angle 72.5° 72.5° 72.5° 72.5°
Standover Height 30.4 773.4 31.5 799.7 32.5 825.8 33.7 856.6
Fork Length 19.0 483.0 19.0 483.0 19.0 483.0 19.0 483.0
Fork Rake 1.9 47 1.9 47 1.9 47 1.9 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

Select a few bike sizes to compare.

SIZE S M L XL
Reach 15.9 404 16.8 426 17.6 448 18.5 470
Stack 23.3 593 23.7 602 24.1 612 24.4 621
Head Tube Angle 69° 69° 69° 69°
Head Tube Length 3.5 90 3.9 100 4.3 110 4.7 120
Seat Tube Length 14.7 375.0 16.7 425.0 18.7 475.5 20.7 525.0
BB Drop 2.6 65 2.6 65 2.6 65 2.6 65
Wheelbase 42.8 1086.8 43.8 1112.6 44.8 1138.3 45.8 1164
Chainstay Length 17.1 435 17.1 435 17.1 435 17.1 435
Top Tube Length, Actual 21.9 556.8 22.6 573 23.4 595.1 24.5 621.8
Top Tube Length, Effective 23.0 585 24.0 610 25.0 635 26.0 660
Seat Tube Angle 73° 73° 73° 73°
Standover Height 30.3 770 31.4 797 32.5 825 33.6 854
Fork Length 19.0 483 19.0 483 19.0 483 19.0 483
Fork Rake 1.9 47 1.9 47 1.9 47 1.9 47

Select a few bike sizes to compare.

SIZE Small (15) Medium (17) Large (19) xLarge (21)
Reach 15.7 399.0 16.6 421.6 17.4 441.1 17.8 451.7
Stack 23.2 589.8 23.4 594.5 23.6 599.2 24.1 613.2
Head Tube Angle 69.5° 69.5° 69.5° 69.5°
Seat Tube Length 14.8 375.0 16.7 425.0 18.7 475.5 20.7 525.0
BB Drop 2.4 60.0 2.4 60.0 2.4 60.0 2.4 60.0
Wheelbase 43.0 1091.1 44.0 1116.7 44.8 1138.8 45.5 1155.3
Chainstay Length 17.6 446.0 17.6 446.0 17.6 446.0 17.6 446.0
Top Tube Length, Actual 22.1 561.0 22.8 578.0 23.5 597.4 24.2 614.7
Top Tube Length, Effective 23.0 585.0 24.0 609.0 24.8 630.0 25.4 645.0
Seat Tube Angle 72.5° 72.5° 72.5° 72.5°
Fork Length 19.0 483.0 19.0 483.0 19.0 483.0 19.0 483.0
Fork Rake 1.9 47.0 1.9 47.0 1.9 47.0 1.9 47.0

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

Tubing

Andy's Apple Red, Dark Black and Pickled Beet Red:

Surly 4130 CroMoly steel. Custom double-butted trumpet tube main triangle. TIG-welded. ED coated.

Moonlit Swamp and Black Matte:

Surly 4130 CroMoly steel. Main Triangle TIG-welded, custom butted. Sweet CS Yoke. ED coated.

Rear Dropouts

Andy's Apple Red, Dark Black and Pickled Beet Red:

12mm horizontal and vertical slotted with derailleur hanger and Surly "Gnot-Boost" 135, 142, and/or 148mm hub spacing compatibility.

Moonlit Swamp:

Horizontal slotted w/derailleur hanger, 135mm O.L.D.

Black Matte:

Surly Modular Dropout System gives you the option of 142 x 12 thru axle (Shimano Direct Mount derailleur hanger [axle included]), 10mm QR geared, or singlespeed

Brake Compatibility

Andy's Apple Red, Dark Black and Pickled Beet Red:

51mm I.S. disc caliper mounts, 180mm max rotor size

 

Moonlit Swamp and Black Matte:

51mm IS disc mounts frame and fork

Braze-ons/extras

Andy's Apple Red, Dark Black and Pickled Beet Red:

Two down tube bottle-mounts on all sizes (SM-XL), no seat tube bosses

Moonlit Swamp:

Dual water bottle mounts, Surly Trip Guide full line guides for brake and derailleurs, fender eyelets

Black Matte:

Dual water bottle mounts, Surly Trip Guide full line guides for brake and derailleurs, fender and rack eyelets

Seatpost Diameter

Andy's Apple Red, Dark Black and Pickled Beet Red:

30.9mm

Moonlit Swamp and Black Matte:

27.2mm

Seatpost Clamp Diameter

Andy's Apple Red, Dark Black and Pickled Beet Red:

33.1mm (Surly Stainless included)

Moonlit Swamp:

30.0mm, high direct mount standard, clamp adapter include

Black Matte:

30.0mm

Headset/Steerer Tube

Andy's Apple Red, Dark Black and Pickled Beet Red:

ZS44/28.6 upper, EC44/30 lower

Moonlit Swamp and Black Matte:

44mm ID. Recommend EC44 lower cups. Zero Stack on top is OK.

Front Derailleur Clamp Diameter

Andy's Apple Red, Dark Black and Pickled Beet Red:

34.9mm, high direct-mount

Moonlit Swamp and Black Matte:

31.8mm, high direct mount standard, clamp adapter included

Bottom Bracket Shell

Andy's Apple Red, Dark Black and Pickled Beet Red:

73mm

Moonlit Swamp and Black Matte:

73mm shell width, threaded standard English (1.37" x 24t)

Chainring Clearance

Andy's Apple Red, Dark Black and Pickled Beet Red:

30t Boost 1x, 24/36t Boost 2x

Moonlit Swamp and Black Matte:

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

Andy's Apple Red, Dark Black and Pickled Beet Red:

15mm Thru-Axle, 1-1/8" steerer tube, 203mm disc brake clearance and 29 x 3.0" tire clearance

Moonlit Swamp and Black Matte:

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

Andy's Apple Red

Dark Black

Pickled Beet Red

Moonlit Swamp

Black Matte

Support

Frame Warranty

LIMITED WARRANTY

This Surly product is warranted against defects in materials and workmanship for three years from the date of retail purchase of the product, subject to the limitations detailed below. Save your dated receipt for proof of purchase.

This warranty does NOT cover the following:

  • Damage due to improper assembly or follow-up maintenance or lack of skill, competence or experience of the user or assembler
  • Products that have been modified, neglected, used in competition or for commercial purposes, misused or abused, involved in accidents or anything other than normal use
  • Installation of components, parts or accessories not originally intended for or compatible with bicycle as sold
  • Damage or deterioration to the paint, surface finish, aesthetics or appearance of the product
  • Normal wear and tear
  • Labor required to remove and/or refit and re-adjust the product within the bicycle assembly

This limited warranty is expressly limited to the repair or replacement of a defective product, at the option of Surly, and is the sole remedy of the warranty. This limited warranty applies only to the original purchaser of the Surly product and is not transferrable. This warranty applies only to products purchased through an authorized dealer or distributor. In no event shall Surly be liable for any loss, inconvenience or damage, whether direct, incidental, consequential, or otherwise resulting from breach of any express or implied warranty or condition, of merchantability, fitness for a particular purpose, or otherwise with respect to our products except as set forth herein.

This limited warranty gives the consumer specific legal rights, and those rights and other rights may vary from place to place. This limited warranty does not affect your statutory rights.

TO THE EXTENT NOT PROHIBITED BY LAW, THESE WARRANTIES ARE EXCLUSIVE AND THERE ARE NO OTHER EXPRESS OR IMPLIED WARRANTIES OR CONDITIONS INCLUDING WARRANTIES OR CONDITIONS OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.