Krampus Ops

Item #CN_EVO12

Complete bike spec subject to change


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

Surly Krampus, TIG-welded custom tapered butted 4130 CroMoly, 100–120mm suspension corrected, 1-1/8˝ steerer tube, 203mm disc brake clearance

Seatpost clamp
Surly Stainless, 30.0mm


Surly, O.D. 33

Bottom Bracket
Surly, O.D. 33

Front Derailleur
MRP 1x guide. BB mount, yep

Rear Derailleur
Shimano SLX Shadow+, Black

Cog or Cassette
SRAM GG-1070, 10-speed. 11–36t

KMC x10, Silver


Cane Creek, 40 series for 44mm

Avid BB7, 180/160 HS rotors

Brake Levers
Avid FR-5, Black

Shimano SLX, 10-speed RH

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

Salsa, Salt Flat

Velo VL2155, Steel rails

Chain guide


Front Hub
Surly Ultra New Disc, 32h. 6-bolt disc. Black

Rear Hub
Shimano FH-M525, 32h. Disc. Black

Surly Rabbit Hole 29+, 700c x 50mm w/holes

DT Swiss, 14g

Surly Knard 29 x 3.0˝, 27tpi

Frame Size Stem Length Stem Angle Handlebar Width Crank Length
Small 60.0 7.0 700.0 170.0
Medium 70.0 7.0 750.0 175.0
Large 80.0 7.0 750.0 175.0
xLarge 90.0 7.0 750.0 180.0

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

Rear dropouts:
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:
51mm IS disc mounts frame and fork

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

Seatpost diameter:

Seatpost clamp diameter:

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

Front derailleur clamp diameter
31.8mm, 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, for doubles, run a Surly O.D. Crankset for best tire clearance.)

Tire clearance:
29 x 3.0˝

TIG-welded custom tapered butted 4130 CroMoly, 100–120mm suspension corrected, 1-1/8˝ steerer tube, 203mm disc brake clearance

Flat Black
10 in stock
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Additional information

Weight 1 kg
Dimensions 1 x 1 x 1 cm

Black Matte

Product Description

There is no need to for us to immerse you once again in the bath that is the Krampus, or 29+ for that matter. Go here if you really need the meat and potatoes of what this bike is all about. There’s plenty of info there to get you up to speed. But you probably know that already, don’t you?

The “Ops” in Ops here at Surly is short for “Optional” and to us that means that this build doesn’t just have some fancy new trim package, but is spec’d and in this case designed a bit differently to offer the user “optional” utility. Other utility. The Krampus Ops comes with a Surly OD crank, giving you far more possibilities for drivetrain (you can convert it to an off-set double by adding one of our chainrings and then using a direct mount standard front derailleur and an adapter to give you optimal tire clearance). So a few more options there.

The Krampus Ops also features our Modular Dropout System (MDS), allowing you to change up your drivetrain according to needs. Frames ship with MDS dropouts in 10mm track end singlespeed, standard vertical with derailleur hanger and a 142 x 12mm thru-axle versions while complete bikes ship with the 10mm vertical chip. You may do what you will. Again, with all these options how will you ever get out of your house? You’ll manage.

Krampus hub spacing is standard 100mm front and MDS rear chips allow you to choose either 135mm or 142 x 12mm thru-axle hubs. It’s got clearance for disc rotors up to 185mm and is designed to run a high direct mount standard front derailleur. For best chain/tire clearance, we recommend either a Surly O.D. 2x crank (which comes on the complete)(oh the options) or a 1x system. Other brands 2x cranks will work but may cause some chain-on-tire rub in the easiest gear combo.

Enough options for you? Probably not, but we’re not machines. Now go get on and get off.


L, M, S, Xl

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