Surly Krampus MDS 29+ Frameset Flat Black Medium

Krampus is the evolution of the 29er. It’s not a fat bike. True, its got 3” tires on 50mm rims (we call this combination “29+”). But where fat bikes are really designed for slow-speed crawling, Krampus’s frame (geometry, tubing diameter/thickness) has been designed with a long toptube and as short a rear end as we could get away with given the wheel/tire size. This, when combined with the big, wide tires, results in a mad amount of rolling inertia and grip. It rips and responds well to body English. The big tires also offer a bit of suspension-like cushion. Krampus is a trail bike that also tackles all kinds of terrain. Krampus lives somewhere between bushwhacking, speed racing, and back lot dirt track riding, and all this makes it just plain fun to ride.

Krampus’s hub spacing is standard 100mm front and 135mm rear, with rear-loading horizontal dropouts that accommodate a derailleur and single ring/cog drivetrains. It’s got clearance for disc rotors up to 185mm and is 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 the sort of frame offset you find on our Pugsley and Moonlander models, chain and derailleur clearance at the tire remains a serious consideration. 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 Rabbit Hole rims and 3˝ Knard 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 O.D. 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? O.K., then. Give it the juice and hang on.

• Tubing: Surly 4130 CroMoly steel. Main Triangle TIG-welded, custom butted. Sweet CS Yoke.
• Rear Dropouts: Surly  135x10mm QR geared, (MDS gives you the option of 142 x 12 thru axle or singlespeed sold separate)
• Brake Compatibility: 51mm IS disc mounts frame and fork
• Braze-ons/extras: Dual water bottle mounts, Surly Trip Guide full line guides for brake and derailleurs, fender and rack eyelets
• Seatpost diameter: 27.2mm
• Seatpost clamp diameter: 30.0mm
• Headset/Steertube: 44mm ID. Recommend EC44 lower cups. Zero Stack on top is o.k.
• 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˝
• Fork: TIG-welded custom tapered butted 4130 CroMoly, 100–120mm suspension corrected, 1-1/8˝ steerer tube, 203mm disc brake clearance
• Color: Flat Black