NEW Surly Karate Monkey Steel Rigid Mountain Bike - Fool's Gold - 210000037683

NEW Surly Karate Monkey Steel Rigid Mountain Bike - Fool's Gold - 210000037683

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

Specifications

• Frame: 100% Surly Chromoly Steel, Custom double-butted, externally flared tubing, Horizontal slotted with derailleur hanger, Surly “Gnot Boost” 142 or 148mm hub spacing compatibility
• Fork: 100% Surly Chromoly Steel, 483mm axle-to-crown x 47mm offset, 110mm hub spacing, Tapered and butted straight blade, 4130 Chromoly, 51mm I.S. disc mount
• Crankset: Shimano Deore FC-MT510-1, 30t
• Bottom Bracket: Shimano (included with crankset)
• Front Derailleur: N/A
• Rear Derailleur: Shimano Deore RD-M6100, 12-speed
• Cassette / Cog: SunRace CSMZ800, 11-51t, 12-Speed
• Chain: KMC X12 NP/BK
• Grips / Bar Tape: Velo lock-on
• Handlebar: Salsa Rustler without logo
• Stem: ProMax, 31.8
• Headset: Cane Creek 15
• Rear Shifter: Shimano Deore SL-M6100
• Brake & Rotors: Tektro HD-M275, 180mm front & 160mm rear
• Saddle: WTB Volt 142
• Seatclamp: Surly stainless, 33.1mm
• Seatpost: ProMax, 30.9
• Front Hub: 110mm, Novatec, 32h, Thru-Axle
• Rear Hub: 148mm, Novatec, 32h, Thru-Axle
• Rims: WTB i40 TCS
• Tires: Surly Dirt Wizard 29 x 3”, 60 tpi, Tubeless Ready

What our Experts Think

• A proven all-purpose steel hardtail platform, the Surly Karate Monkey Rigid MTB is built for riders who want maximum versatility across trail, gravel, and bikepacking use.
• Durable 4130 Chromoly steel frame and rigid fork deliver long-lasting strength, a smooth ride feel, and low-maintenance reliability for everyday and adventure riding.
• 29” wheel compatibility with wide tire clearance provides excellent rollover capability, traction, and stability on rough singletrack and mixed terrain.
• Rigid MTB design for simplicity and control, favoring durability, efficiency, and rider feel over suspension complexity.
• Highly modular geometry, allowing riders to adapt components for trail riding, commuting, or long-distance off-road touring.
• Bikepacking-ready mounting points support racks, cages, and cargo setups for extended backcountry expeditions.
• Fool’s Gold finish delivers a distinctive, retro-inspired aesthetic that highlights the bike’s utilitarian steel character.
• Frequently chosen by riders who want a “one bike does it all” steel platform that can handle commuting, trail riding, and adventure touring equally well.
• Ideal for cyclists seeking a simple, tough, and endlessly adaptable rigid mountain bike that rewards skill and creativity across varied terrain.

Q&A

Q: What is the Surly Karate Monkey designed for?
A: The Surly Karate Monkey is a highly versatile hardtail/rigid MTB built for trail riding, bikepacking, commuting, and mixed-terrain adventure.

Q: What makes it different from other mountain bikes?
A: It supports both 27.5" and 29" wheel setups, giving riders flexibility to tune handling for agility or speed and stability.

Q: What frame material is used?
A: It is made from Surly 4130 Chromoly steel, known for durability, comfort, and long-term off-road reliability.

Q: What terrain is it best for?
A: It performs well on singletrack, gravel, forest roads, and rough utility routes where strength and control matter.

Q: Is it good for bikepacking?
A: Yes. It includes multiple mounting points for racks, bottles, and cargo systems, making it ideal for loaded adventure riding.

Q: Why choose the Surly Karate Monkey?
A: Riders choose it for its adaptable wheel compatibility, simple rigid setup (lower maintenance), and rugged steel construction for all-purpose riding.

Maintenance Tips

• Clean frame, fork, and drivetrain after trail, mud, or wet rides to prevent corrosion and drivetrain wear.
• Inspect chromoly steel 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 riding conditions.
• Grease all threaded interfaces (bottom bracket, headset, thru-axles, bottle/rack mounts) to prevent seizing.
• Check rigid fork, dropouts, and disc brake mounts frequently for tightness and alignment after rough trail use.
• Maintain drivetrain (chain, cassette, chainrings) with regular cleaning and lubrication, especially after muddy rides.
• Keep tire clearance clear of packed mud or debris, especially with wider 27.5/29 tire setups.
• Inspect wheels, hubs, and bearings regularly due to trail impacts and rigid-frame vibration transfer.
• Avoid pressure washing to protect bearings, seals, and frame joints from water intrusion.
• Store indoors in a dry place to preserve steel durability and finish longevity.