Bikes. Parts. Chaos.

Krampus is a dedicated 29+ trail bike that can go over, off of, or through just about anything in its path.

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 tires 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" tires

Bike Capabilities

  • 5/5 with Singletrack
  • 4/5 with Bikepacking
  • 3/5 with Commuting
  • 5/5 with Tire Clearance

NOTE: You can ride your bike wherever the hell you want, but this is what we think this bike is best at.

Krampus catching air
Krampus on trail
Red Krampus
Krampus goes fast
Krampus skids

#krampus Image Dump

Tag your Instagram Images with #SurlyMakeItYourOwn and your bike may show up here.

Where to Buy

Krampus Bike Bruised Ego Purple



Frame Surly 4130 Chromoly Steel

Custom double butted externally flaired tubing. Horizontal slotted with derailleur hanger, Surly “Gnot Boost” 142 or 148mm hub spacing compatibility

Fork Surly 4130 Chromoly Steel

483mm axle-to-crown x 47mm offset, 110mm hub spacing, tapered and butted straight blade, 4130 Chromoly. 51mm I.S. disc mount

Seatpost Clamp Surly stainless, 33.1mm


Headset Cane Creek
Brakes SRAM Level
Brake Levers SRAM Level
Rotors SRAM Centerline 180/160
Shifters SRAM NX
Grips Velo Single lock-on
Stem ProMax 4-bolt, 31.8mm
Handlebar Salsa Rustler 31.8mm
Saddle WTB Volt Sport
Seatpost 2-bolt, 30.9 x 410mm


Crankset SRAM NX 30t
Bottom Bracket SRAM Power Spline
Front Derailleur None
Rear Derailleur SRAM NX
Cog or cogset Sunrace 11 speed 11-42t
Chain KMC X11EL-1


Front Hub Novatec, 32h, Thru-Axle
Rear Hub Novatec, 32h, Thru-Axle
Rims WTB ST i40 TCS
Tires Surly Dirt Wizard 29 x 3”, 60 tpi Tubeless Ready

Complete bike spec subject to change

MY19 Krampus Geometry
  • in
  • mm
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 69.0° 69.0° 69.0° 69.0°
Head Tube Length 3.5 90 3.9 100 4.3 110 4.7 120
Seat Tube Length 14.5 368 16.5 419 18.5 470 205 521
BB Drop 2.6 65 2.6 65 2.6 65 2.6 65
Wheelbase 42.8 1087 43.8 1113 44.8 1138 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 73.0° 73.0° 73.0° 73.0°
Standover Height 30.3 770 31.4 797 32.5 825 33.6 854
Stem Length 2.8 70 2.8 70 2.8 70 3.1 80
Stem Angle
Handlebar Width 29.5 750 31.5 800 31.5 800 31.5 800
Crank Length 6.7 170 6.9 175 6.9 175 6.9 175
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

*Standover is measured from the top of the TT, at the center, with a tire measuring approximately Ø773mm

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


Steerer Tube

Ø28.6mm (1-1/8")

Crown Race

Ø30mm (1-1/8")

Stock Headset Upper (S.H.I.S)


Stock Headset Lower (S.H.I.S)


Seat Collar




Front Derailleur (Clamp)

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

Max Chainring (CL) [3]

1x (Mtn): 28T
1x (Boost): 30T
2x (Boost): 24/36T

Bottom Bracket

73mm threaded (1.37" x 24TPI)

Tire Clearance Frame [1]/[2]

29 x 3.0”

Tire Clearance Fork [1]

29 x 3.0”

Rigid Fork Spec

483 x 47mm

Max Suspension Fork Length [4]

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


Fender Mounts Fork


Other Features

Internal dropper post routing compatible

[1] Different tire and rim combinations will result in different clearances.
[2] Depending on drivetrain configuration, tire clearance may be limited by the chain and not the frame.
[3] Listed chainring clearance is worst case scenario.  Clearances vary widely depending on components and configurations.
[4] Suspension fork length listed at full extension (not at sag)

FAQ & Reviews


Frame 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.