Overview
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
Features
100% Surly Chromoly steel frame and fork; double-butted main triangle and 44mm headtube
Gnot-Boost adjustable rear dropouts
Internal dropper seatpost routing
30.9mm seat tube
Designed to fit up to 29 x 3.0” tires
Specs
| Frame measurements (mm) | SM | MD | LG | XL |
|---|---|---|---|---|
| A. Effective Top Tube | 585 | 610 | 635 | 660 |
| B. Stand Over | 770 | 797 | 825 | 853 |
| C. Reach | 404 | 426 | 448 | 470 |
| D. Stack | 593 | 602 | 612 | 621 |
| E. Total Seat Tube Length | 368 | 419 | 470 | 521 |
| F. Headtube Length | 90 | 100 | 110 | 120 |
| G. Headtube Angle | 69 | 69 | 69 | 69 |
| H. Seat Tube Angle | 73 | 73 | 73 | 73 |
| I. BB Drop | 65 | 65 | 65 | 65 |
| J. BB Height | – | – | – | – |
| K. Chainstay Length | 435 | 435 | 435 | 435 |
| L. Fork Length Axle to Crown | 483 | 483 | 483 | 483 |
| M. Fork Offset | 47 | 47 | 47 | 47 |
| N. Wheelbase | 1087 | 1113 | 1138 | 1164 |
| Component measurements (mm) | ||||
| Crank Arm Length | 165 | 165 | 170 | 170 |
| Handlebar Width | 750 | 800 | 800 | 800 |
| Stem Length | 70 | 70 | 70 | 80 |
* All dimensions are preliminary and subject to change
Wheel & Tire Compatibility
Designed For: 29 × 3.0″
Max Tire Size: 29 × 3.0″
Clearance varies by rim/tire combo and drivetrain setup (chain may limit clearance)
Frame & Fork
Frame: 4130 Chromoly, double-butted main triangle, trumpet flared tubes, TIG welded, E.D. coated
Fork: 4130 Chromoly, double-butted tapered blades, TIG welded, E.D. coated
Rigid Fork Length: 483mm
Axle-to-Crown: 483mm
Fork Offset: 47mm
Suspension Compatibility:
- Max fork: 550mm axle-to-crown (29+ / 120mm travel)
Frame Standards
Rear Spacing: “Gnot-Boost” 145mm
- 12 × 142mm or 12 × 148mm (Surly axle included)
- 10 × 135mm (with adapter washers, not included)
Front Spacing: 15 × 110mm
Bottom Bracket: 73mm threaded (1.37″ × 24 TPI)
Brakes
Rear Brake Mount: IS (51mm), up to 203mm rotor
Front Brake Mount: IS (51mm), up to 203mm rotor
Headset & Front End
Headset Upper: ZS44/28.6
Headset Lower: EC44/30
Steerer Tube: Ø28.6mm (1-1/8″)
Crown Race: Ø30mm
Stem Clamp: Ø28.6mm
Seat Area
Seatpost: Ø30.9mm
Seatpost Clamp: Ø33.1mm
Dropper Compatible: Yes
Drivetrain Compatibility
Front Derailleur Clamp: Ø34.9mm
Front Derailleur Type: High direct mount, top-pull
Offset Adapters (not included):
- 26mm offset (for 142/135mm rear spacing)
- 29mm offset (for 148mm rear spacing)
Max Chainring Options:
- 1x (MTB): 28T
- 1x (Boost): 30T
- 2x (Boost): 24/36T
Mounts & Utility
Bottle Mounts: 1 standard + 1 Three-Pack
Fender Mounts:
- Rear: Yes
Specifications subject to change without notice.
Warranty
Register your purchase at Surly’s Warranty Registration.
LIMITED WARRANTY FOR THE SURLY KRAMPUS
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.