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5 Singletracks members own this.
MSRP: $1,950
#29 out of 107 Fat Bikes
Brand: Surly
Tags: Fat Bike
There's been a lot of buzz lately about fat bikes such as our Pugsley and Moonlander, bikes with massive 4 and 5˝ tires designed to crawl over and through unusual or difficult terrain. These types of bikes are all about stability, traction, and floatation.

The Krampus is not the same animal. True, it's got bigger-than-usual tires (29 x 3˝ Knard tires on 50mm Rabbit Hole rims, to be exact), a platform we have dubbed "29 ". But as you may know, we're not the kind of people to just throw on bigger-than-usual tires for no reason, or to attract attention. While the big tires are impossible to ignore, and do in fact offer increased traction and some degree of float, don't assume that these big tires are only for slow speed crawling. The Krampus's frame (geometry, tubing diameter and thickness) has been designed with a long toptube and as short a rear end as we could get away with. This, when combined with the big, wide tires, results in a mad amount of rolling inertia and grip. It can go real fast. It responds well to body English.

So Krampus rolls fast, holds speed, corners like it's on rails, etc. At this point you may be thinking, "Wha? Surly make race bike?" Well no, not exactly. It's still a Surly...durable, slightly overbuilt. It does exceedingly well rolling over all kinds of stuff, things you'd normally think you'd need suspension to tangle with. Krampus lives somewhere between bushwhacking, speed racing, and back lot dirt track riding, and all this makes it just plain fun to ride.

Hub spacing is standard 100mm front and 135mm rear, with rear fork ends that accommodate a derailleur or singlespeed set up. Krampus features our Trip Guides for running full length derailleur housing and brake line. Note that there is no housing stop for a front derailleur, as it was 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 frame offset as on frames meant for 4 and 5˝ tires, chain and derailleur clearance at the tire remains a serious consideration. It breaks down like this:

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 rims and 3˝ 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 MWOD 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?

Someday, when the bicycles and insects have merged their lineages and become the dominant, unstoppable race on the planet Earth, Krampus will no doubt be this new species' Sarah Connor. We're looking forward to it.

Frame Surly Krampus, Surly 4130 CroMoly steel. TIG-welded. Main triangle custom butted

Fork Surly Krampus, Surly 4130 CroMoly steel. TIG-welded. 1-1/8" threadless steer tube, uncut


Crankset & BB Shimano SLX, 170 on Small, 175

Front Derailleur None, Yep

Rear Derailleur Shimano SLX, 10-speed Shadow

Cog or Cogset SRAM PC 1050, 10-speed 11/36

Chain KMC x10,


Headset Cane Creek, 40 series for 44mm

Brakes Avid BB7, 180/160 HS rotors

Brake Levers Avid BB5, Black

Shifters Shimano SLX, 10-speed RH

Stem Kalloy 31.8, 60/70/80/90mm length

Handlebar Salsa Wammy, 0° rise, 780mm width

Saddle Velo,

Seatpost Kalloy,

Extras chain guide, Surly stainless steel post clamp. 14g DT Swiss spokes


Rims Surly Rabbit Hole, 700 x 50mm w/ holes

Front Hub Surly Ultra Disc, 32h black disc

Rear Hub Shimano 529, 32h black disc

Tires Sulry Knard 29 x 3, 27tpi

Frame Size Stem Length Stem Angle Handlebar Width Crank Length

Small 60 7 720 170

Medium 70 7 780 175

Large 80 7 780 175

XLarge 90 7 780 175

Frame Highlights

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

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

Brake compatibility 51mm IS disc mounts frame and fork.

Max Disc Brake Rotor Size 203mm

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

Seatpost diameter 27.2mm

Seatpost clamp 30.0mm (Surly stainless included)

Headset/Steertube 44mm ID. Recommend EC44 lower cups. Zero Stack on top is o.k.

Front derailleur compatibility 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)

Tire clearance 29 x 3"

Fork TIG-welded custom butted 4130 CroMoly, 120mm suspension corrected, 1-1/8" steerer tube, 203mm disc brake clearance

Color Moonlit Swamp

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