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

Breaking the Mold 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 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 Singletrack: 5 out of 5
  • 4/5 with Bikepacking Bikepacking: 4 out of 5
  • 3/5 with Commuting Commuting: 3 out of 5
  • 5/5 with Tire Clearance Tire Clearance: 5 out of 5

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

Krampus, complete rigid and front suspension mountain bikes
Krampus catching air
Krampus, Demonic Sparkle Party complete bike side view
Krampus, Demonic Sparkle Party seat tube decal
Krampus goes fast
Krampus, First Loser, seat tube decal
Krampus, Demonic Sparkle Party complete bike front 3/4 view
Krampus, Demonic Sparkle Party rear view
Krampus, First Loser, front 3/4 view
Krampus, Demonic Sparkle Party seatstay/rear tire clearance
Krampus, First Loser, Natch decal
Krampus, Demonic Sparkle Party rear dropout
Krampus skids
Krampus, Demonic Sparkle Party RockShox suspension fork
Krampus, Demonic Sparkle Party down tube decal
Krampus, First Loser, rigid fork

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Where to Buy

Krampus Bike, Demonic Sparkle Party

Specifications

Frameset

Frame

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

29" - 120mm travel. 51mm offset. 15 x 110mm Axle, Disc, Maxle Stealth. Diffusion Black.
Seatpost Clamp Surly stainless, 33.1mm

Components

Headset Cane Creek 15
Brakes Tektro Gemini HD-M520
Brake Levers Tektro Gemini HD-M520
Rotors Tektro, 180/160
Shifter Shimano Deore XT, SL-M8100
Grips Velo - lock on
Stem ProMax, 31.8mm
Handlebar Salsa Rustler without logo
Saddle WTB Volt 142
Seatpost

120mm travel, 30.9mm, handlebar mounted remote lever

Drivetrain

Crankset Shimano Deore FC-M6100, 30t
Bottom Bracket Shimano, included with crankset
Front Derailleur N/A
Rear Derailleur Shimano Deore XT, RD-M8100, 12-speed
Cog or cogset SunRace CSMZ800, 11-51t, 12-Speed
Chain KMC X12 NP/BK

Wheels

Front Hub 110mm, Novatec, 32h, Thru-Axle
Rear Hub 148mm, Novatec, 32h, Thru-Axle
Rims WTB i30 TCS
Tires Surly Dirt Wizard 29 x 2.6”, 60 tpi, Tubeless Ready

Frameset

Frame

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

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

Components

Headset Cane Creek 15
Brakes Tektro HD-M275
Brake Levers Tektro HD-M275
Rotors Tektro 180/160mm
Shifter Shimano Deore SL-M6100
Grips Velo - lock on
Stem ProMax, 31.8mm
Handlebar Salsa Rustler without logo
Saddle WTB Volt 142
Seatpost ProMax, 30.9

Drivetrain

Crankset Shimano Deore FC-MT510-1, 30t
Bottom Bracket Shimano, included with crankset
Front Derailleur N/A
Rear Derailleur Shimano Deore RD-M6100, 12-speed
Cog or cogset SunRace CSMZ800, 11-51t, 12-Speed
Chain KMC X12 NP/BK

Wheels

Front Hub 110mm, Novatec, 32h, Thru-Axle
Rear Hub 148mm, Novatec, 32h, Thru-Axle
Rims WTB i40 TCS
Tires Surly Dirt Wizard 29 x 3”, 60 tpi, Tubeless Ready

Complete bike spec subject to change

MY21 Krampus Suspension Fork Geometry MY21 Krampus Rigid Fork Geometry
units:
SIZE SM MD LG XL
Reach 15.6 397 16.5 419 17.4 442 18.3 464
Stack 23.5 597 23.9 607 24.3 616 24.6 626
Head Tube Angle 68.4° 68.4° 68.4° 68.4°
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 2.4 60 2.4 60 2.4 60 2.4 60
Wheelbase 43.1 1096 44.1 1121 45.2 1147 46.2 1173
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 23.1 587 24.1 612 25.1 637 26.1 662
Seat Tube Angle 72.4° 72.4° 72.4° 72.4°
Standover Height 30.6 776 31.6 803 32.8 832 33.9 861
Stem Length 2.8 70 2.8 70 2.8 70 3.1 80
Stem Angle 6° 6° 6° 6°
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 19.6 498 19.6 498 19.6 498 19.6 498
Fork Rake 2.0 51 2.0 51 2.0 51 2.0 51

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

SIZE SM MD LG 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 69.0° 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 33.6 853
Stem Length 2.8 70 2.8 70 2.8 70 3.1 80
Stem Angle 6° 6° 6° 6°
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

Ø44mm
Steerer Tube

Ø28.6mm (1-1/8")
Crown Race

Ø30mm (1-1/8")
Stock Headset Upper (S.H.I.S)

ZS44/28.6
Stock Headset Lower (S.H.I.S)

EC44/30
Seat Collar

Ø33.1mm
Seatpost

Ø30.9mm
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 - Rigid Fork [1][5]

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

Yes
Fender Mounts Fork

N/A
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)
[5] For suspension fork tire clearance, please reference the fork manufacturer's website.

FAQ & Reviews

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.