NEW Surly Karate Monkey Mountain Bike Frameset - 27.5/29", Steel, Snow Mold - 210000059445
The Karate Monkey features updated, progressive trail geometry, our custom trumpet tubeset and Surly’s Gnot-Boost rear dropout system. Available in a variety of colors, with multiple drivetrain and wheel size configurations.
Features
- 100% Surly Chromoly steel frame and fork; double-butted main triangle and 44mm headtube
- The tubeset uses the same trumpet tubes found on Instigator 2.0 frame
- Adjustable rear dropouts with 145mm Gnot-Boost spacing. Works with 142, 148 12mm thru, as well as 135mm w/ 10/12 washer
- Internal dropper seatpost routing with 30.9mm seat tube ID
- Clearance for 29 x 2.55 or 27.5 x 3 tires
What our Experts Think
-
A legendary modular hardtail platform, the Surly Karate Monkey Frameset is built for riders who want a highly adaptable steel mountain bike that can evolve with any terrain or riding style.
-
Durable 4130 Chromoly steel frame and fork deliver Surly’s signature blend of strength, comfort, and long-term reliability for aggressive trail use and bikepacking.
-
Mixed wheel compatibility (27.5" or 29") allows riders to prioritize agility or rollover speed depending on build and terrain demands.
-
Trail-ready geometry with modern versatility, offering a balanced feel that works equally well for singletrack, forest roads, and multi-day off-road touring.
-
Highly adaptable platform for customization, supporting rigid or suspension forks, different drivetrains, and a wide range of cockpit setups.
-
Bikepacking-focused mounting options make it equally capable as a backcountry expedition rig or a daily trail explorer.
-
Snow Mold finish adds a distinctive, understated aesthetic while maintaining Surly’s rugged, utilitarian design language.
Q&A
Q: What is the Surly Karate Monkey Frameset designed for?
A: The Surly Karate Monkey Frameset is a versatile hardtail MTB frameset built for trail riding, bikepacking, commuting, and off-road exploration.
Q: What makes the Karate Monkey versatile?
A: It supports both 27.5" and 29" wheel setups, letting riders choose between agility (27.5) or rollover speed and stability (29).
Q: What frame material is used?
A: It’s made from Surly 4130 Chromoly steel, offering durability, comfort, and long-term trail reliability.
Q: What terrain is it best suited for?
A: It performs well on singletrack, forest trails, gravel roads, and mixed terrain where strength and control matter.
Q: Is it good for bikepacking?
A: Yes. It includes multiple mounts for racks, bottles, and cargo setups, making it ideal for loaded adventure riding.
Q: Why choose the Surly Karate Monkey Frameset?
A: Riders choose it for its adaptable wheel compatibility, tough steel construction, and proven capability as a do-it-all trail and adventure platform.
Maintenance Tips
- Clean frame and fork after trail, mud, or winter rides to prevent corrosion and protect the steel finish.
- Inspect chromoly frame regularly for paint chips, rust spots, dents, or stress marks; touch up exposed steel promptly.
- Apply internal frame rust inhibitor annually, especially in wet, snowy, or coastal environments.
- Grease all threaded interfaces (bottom bracket, headset, thru-axles, bottle/rack mounts) to prevent seizing.
- Check suspension-corrected fork, dropouts, and disc brake mounts frequently for tightness and alignment after aggressive riding.
- Maintain drivetrain (chain, cassette, chainrings) with regular cleaning and lubrication, especially after muddy rides.
- Ensure tire clearance stays free of packed mud or debris, especially when switching between 27.5” and 29” wheel setups.
- Inspect accessory and rack mounts regularly if used for bikepacking or loaded trail riding.
- Avoid pressure washing to protect bearings and frame seals from water intrusion.
- Store indoors in a dry place to maximize frame life and finish durability.
Damage 
Loss 
Theft 
