Surly Krampus – Built for Trail Mayhem

The Surly Krampus flips the mullet rule on its head — it’s long in the front, short in the rear, designed to push trail performance to the edge. With a stretched toptube and compact chainstays, the Krampus offers next-level handling, traction, and fun. While the mullet might be “business in the front, party in the back,” the Krampus is all party, all the time — making every ride an adventure.

Key Features

• Modern Trail Geometry: Long front center and short rear triangle for agile, confident handling

• Trail-Ready Design: Dropper post compatibility, 44mm headtube, Gnot-Boost rear spacing, thru-axles, and a suspension-corrected fork

• Versatile Compatibility: Works with most modern mountain bike standards, making it a perfect parts-bin build

• Big Tire Clearance: Fits up to 29" x 3.0" tires for unmatched traction and float

• Adventure-Ready Mounts: Bottle, rack, and fender mounts for bikepacking or daily rides

Technical Specifications

Intended Use: Trail
Wheel Size: 29"
Braking System: Hydraulic Disc
Frame Material: 100% Surly 4130 Chromoly Steel
Fork: Surly 4130 Chromoly, Natch tubing, double-butted tapered fork blades, TIG welded, ED coated
Headtube Diameter: 44mm
Seatpost Diameter: 30.9mm
Bottom Bracket: Threaded, 73mm shell
Cable Routing: Internal
Di2 Compatible: No

Mounting & Compatibility

• Fork Material: 4130 Chromoly Steel

• Brake Type: Hydraulic Disc

• Headset Included: Yes

• Seatpost Included: Yes

• Front Derailleur Mount: Clamp (Top Pull)

• Tire Compatibility: 29 x 3.0”

• Fender & Rack Mounts: Yes (Adventure-Ready)

• Bottle Mounts: Yes

Hub & Drivetrain Details

• Front Hub Spacing: 15 x 110mm (Surly axle included)

• Rear Hub Spacing: “Gnot-Boost” 145mm — compatible with:

  • 12 x 142mm or 12 x 148mm (axle included)

  • 10 x 135mm (with Surly 10/12 Adapter Washers, not included)

• Max Chainring:

  • 1x (Mtn): 28T

  • 1x (Boost): 30T

  • 2x (Boost): 24/36T