About the Surly Bikes Karate Monkey Frameset
The Surly Karate Monkey 27.5+ Frameset is a trail-ready powerhouse built for riders who demand versatility, durability, and top-tier performance. This frame isn’t just a foundation for your next ride—it’s a launchpad for adventure, built to dominate everything from technical singletrack to all-day epics. Designed to handle both 27.5+ and 29-inch wheels, the Karate Monkey adapts to your style, whether you prioritize traction, agility, or pure speed.
Constructed from Surly’s legendary 4130 CroMoly steel, this frame balances strength, compliance, and ride feel like no other. With modern trail features like Gnot-Boost rear spacing, dropper post compatibility, and thru-axles, it’s a future-proof platform that plays well with a wide range of components. Whether you're piecing together a dream build from your parts bin or going full custom, the Karate Monkey makes it easy to craft a ride that’s uniquely yours.
Ideal For:
- Riders who want a versatile, all-terrain hardtail that can handle a variety of conditions.
- Bikepackers and adventure seekers looking for a steel frame that thrives under load.
- Trail riders who appreciate modern geometry, wide tire clearance, and progressive handling.
- Custom builders who need a frame with broad compatibility and multiple setup options.
Key Features:
- Run it your way – Compatible with 29” x 2.5” or 27.5” x 3.0” tires for different ride styles.
- Gnot-Boost rear spacing – Works with 135mm, 142mm, and 148mm hubs for maximum versatility.
- Built for the long haul – 4130 CroMoly steel frame for a smooth, durable, and lively ride.
- Progressive trail geometry – Long top tube, short chainstays, and a 67.5° head angle for responsive handling.
- Fully loaded with mounts – Rack, fender, and multiple bottle mounts for bikepacking and adventure riding.
- Dropper post ready – Internal routing for a modern trail setup.
- Suspension corrected fork – Compatible with 140mm suspension forks or a rigid fork for ultimate customization.
Specifications:
- Frame Material: Surly 4130 CroMoly Steel
- Wheel Size: 27.5+ or 29”
- Brake Type: Disc (51mm I.S. mount, max 180mm rotor)
- Rear Axle: 12mm Thru x 148mm
- Front Axle: 15mm Thru x 110mm
- Headtube: 44mm (fits tapered and straight steerer forks)
- Seatpost Diameter: 30.9mm (dropper-compatible)
- Bottom Bracket: 73mm BSA threaded
- Chainring Clearance: Up to 32T (Boost 1x) or 24/36T (Boost 2x)
- Fork Compatibility: Rigid or 140mm travel suspension fork (547mm A-to-C max)
- Color: Hi-Viz Black
The Surly Bikes Karate Monkey Frameset is an adaptable, steel-framed beast built to take on anything you throw at it. Whether you're hammering through rock gardens, exploring deep backcountry trails, or piecing together the ultimate custom build, this frame delivers confidence, durability, and endless possibilities.