The bike that started the plus-size movement, this model is designed to roll over just about anything you can point it at. By combining the rolling efficiency of 29-inch wheels with the traction and cushion of high-volume 3-inch tires, it offers a ride that is fast, aggressive, and incredibly fun. Whether you are navigating technical singletrack or embarking on a bikepacking adventure, this platform provides the stability and control needed for diverse terrain.
The frame is engineered with Surly’s Gnot-Boost rear hub spacing of 145mm, offering exceptional versatility. This design is compatible with Boost 148 x 12mm thru-axle, 142 x 12mm thru-axle, and 135mm quick-release hubs, allowing for various wheelset configurations to suit your riding style.
- 100% Surly Chromoly steel frame and fork; double-butted main triangle and 44mm headtube
- Gnot-Boost adjustable rear dropouts for fine-tuned handling
- Internal dropper seatpost routing for modern trail performance
- 30.9mm seat tube
- Designed to fit up to 29 x 3.0” tires
| Rear Axle | 12mm Thru x 145mm |
| Brake Type | Disc |
| Fork Type | Rigid |
| Fork Material | Steel |
| Frame Material | Steel |
| Frame Type | Rigid |
| Front Axle | 15mm Thru x 110mm |
| Platform | Krampus |
| Wheel Size | 29+ |
Frameset
- Frame: Surly Krampus – 100% Surly Chromoly steel, Natch tubing, double-butted main triangle, trumpet flaired tubes, TIG welded, E.D. coated
- Fork: Surly Krampus Fork – 100% Surly Chromoly steel, Natch tubing, double-butted tapered fork blades, TIG welded, E.D. coated
- Color: Salmon Skin Silver
Drivetrain
- Front Derailleur: N/A
- Rear Derailleur: Shimano M6100 Deore SGS
- Cassette: Shimano M6100 Deore, 10-51t, 12 speed
- Chain: KMC X12 Anti-Rust
- Crankset: Shimano M6100 Deore, 10-51t, 12 speed
- Bottom Bracket: Shimano MT501, BSA
- Shifter: Shimano M6100 Deore
- Brakes and Rotors: Tektro HD-M275 or HD-M3120, 2 piston, Tektro 160/160mm, 6-Bolt
Components
- Headset: FSA Orbit ITA
- Stem: Promax DA-296, 31.8mm
- Handlebar: Salsa Rustler
- Grips / Bar Tape: Velo Black
- Seatpost: TransX JD-YSP15 Dropper, 30.9mm, 120mm travel
- Saddle: WTB Volt Medium
Wheels
- Front Hub: Novatec 15x110mm, 32h
- Rear Hub: Novatec 12x148mm, 32h
- Rims: WTB ST i40 TCS 2.0 29″
- Tires: Surly Dirt Wizard 29 x 3″ 60tpi, Tubeless Ready, WTB TCS Sealant Included
- Spokes: 14G Black
Other
- Pedals: N/A
- Complete Bike Weight: 30 lbs 14 oz (for Medium)


















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