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.

• Surlys 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.