Description
Experience the pioneering design that ignited the plus-size mountain bike movement with this exceptional 29″ steel frameset. Crafted from 100% premium Surly 4130 CroMoly steel, the frame and fork feature a double-butted main triangle and a robust 44mm headtube, ensuring durability and responsive handling on rugged trails. The updated tube-set incorporates the same trumpet tubes found on the acclaimed 2017 Karate Monkey frame, enhancing strength without compromising weight.
- Surly’s innovative Gnot-Boost rear hub spacing of 145mm is compatible with Boost 148 x 12mm thru-axle, 142 x 12mm thru-axle, and 135mm quick-release hubs, offering versatile wheel options.
- Adjustable Gnot-Boost rear dropouts provide precise alignment for various drivetrain setups.
- Internal routing for dropper seatposts supports seamless integration and clean aesthetics.
- The 30.9mm seat tube diameter accommodates a wide range of seatpost options.
- Designed to fit up to 29 x 3.0” tires, this frame delivers exceptional traction and stability across diverse terrains.
Frameset
Frame: Surly Krampus, 100% Surly Chromoly Steel, Natch tubing, double-butted main triangle, trumpet flared tubes, TIG welded, E.D. coated
Color: Prickly Pear
Fork: Surly Krampus, 100% Surly Chromoly Steel, Natch tubing, double-butted main triangle, trumpet flared tubes, TIG welded, E.D. coated
Components
Seatpost Clamp: Surly Stainless, 33.1mm
Drivetrain
(Details not provided – can add if available)
Wheels
Front Axle: 15 x 110mm (Surly axle included)
Rear Axle: 12 x 142mm or 12 x 148mm (Surly axle included)
Weight
Frame: 9 lb. 10 oz. (Medium)
| Size | Small | Medium | Large | X-Large |
|---|---|---|---|---|
| A. Effective Top Tube | 23.03 | 24.02 | 25 | 25.98 |
| B. Stand Over | 30.31 | 31.38 | 32.48 | 33.58 |
| C. Reach | 15.91 | 16.77 | 17.64 | 18.5 |
| D. Stack | 23.35 | 23.7 | 24.09 | 24.45 |
| E. Total Seat Tube Length | 14.49 | 16.5 | 18.5 | 20.51 |
| F. Headtube Length | 3.54 | 3.94 | 4.33 | 4.72 |
| G. Headtube Angle | 69.0 | 69.0 | 69.0 | 69.0 |
| H. Seat Tube Angle | 73.0 | 73.0 | 73.0 | 73.0 |
| I. BB Drop | 2.56 | 2.56 | 2.56 | 2.56 |
| K. Chainstay Length | 17.13 | 17.13 | 17.13 | 17.13 |
| L. Fork Length Axle to Crown | 19.02 | 19.02 | 19.02 | 19.02 |
| M. Fork Offset | 1.85 | 1.85 | 1.85 | 1.85 |
| N. Wheelbase | 42.8 | 43.82 | 44.8 | 45.83 |
| Crank Arm Length | ||||
| Handlebar Width | ||||
| Recommended Rider Height | ||||
| Stem Length |
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