Karate Monkey
Karate Monkey
⚠️ WARNING: This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
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The Karate Monkey was one of the first production 29ers. It put the 29˝ platform in front of a lot of people at a price within reach of many a bike nerd. Since then, 29” has become a full-blown category, with entire bike companies dedicated to the platform. In contrast to the old standard 26” wheels, 29˝ wheels have unique benefits: delivering increased traction, smoothing out terrain, carrying inertia, and generally fitting tall riders better.
The Karate Monkey helped set the standard for 29er geometry. While its tucked-in rear wheel keeps it nimble and maneuverable, its lack of shifting componentry keeps the bike simple — and the rider filled with a cathartic rage.
With a frame and fork made of custom-designed Surly CroMoly “’Natch” steel, the Karate Monkey delivers a resilient, lively, durable ride. The Karate Monkey frame has recently been updated to include features like internal dropper post routing, a new tubeset that uses the same trumpet tubes found on our Instigator 2.0, and a slight tweak in geometry that is more progressive and trail oriented. The Karate Monkey uses a horizontal dropout with a derailleur hanger spaced to what we call Gnot-Boost spacing. 10 x 135mm QR, 12 x 142, or 12 x 148 Boost™ will all work in the Karate Monkey frame. The frame uses a 44mm headtube for broad fork compatibility and is ED coated for an added layer of internal protection.
The Karate Monkey SS is the sensei for all of your single speed sensations.
Specifications
Geometry

SIZE | Small (16) | Medium (18) | Large (20) | xLarge (22) |
---|---|---|---|---|
Reach | 394.9 | 415.1 | 428.6 | 440.1 |
Stack | 591.1 | 602.5 | 614.0 | 628.2 |
Head Tube Angle | 71.0° | 71.5° | 72.0° | 72.0° |
Head Tube Length | 100.0 | 100.0 | 110.0 | 125.0 |
Seat Tube Length | 406.4 | 457.2 | 508.0 | 558.8 |
BB Drop | 68.0 | 68.0 | 68.0 | 68.0 |
Wheelbase | 1046.1 | 1064.9 | 1076.8 | 1093.0 |
Chainstay Length | 431.0 | 431.0 | 431.0 | 431.0 |
Top Tube Length, Actual | 557.7 | 575.0 | 589.9 | 607.1 |
Top Tube Length, Effective | 575.6 | 599.3 | 616.3 | 632.2 |
Seat Tube Angle | 73.0° | 73.0° | 73.0° | 73.0° |
Standover Height | 762.9 | 792.7 | 822.5 | 853.5 |
Fork Length | 468.0 | 468.0 | 468.0 | 468.0 |
Fork Rake | 43.0 | 43.0 | 43.0 | 43.0 |
Frame Specs
- Tubing: Surly 4130 CroMoly steel. Main triangle double-butted. TIG-welded . ED Coated
- Rear Dropouts: High-Viz Black: Horizontal slotted with derailleur hanger; Surly “Gnot Boost” 135, 142, or 148mm hub spacing compatibility, threaded fender eyelets; Mint Green: Frame comes equipped as a single speed. Our Modular Dropout System gives you the option of 142 x 12 thru-axle, single speed or Shimano direct mount derailleur
hanger [axle included], 9mm QR geared. More combos than you can shake a stick at.; Ops: Surly Modular Dropout System gives you the option of 142 x 12 thru axle (Shimano Direct Mount derailleur hanger [axle included]), 10mm QR geared, or singlespeed - Brake Compatibility: High-Viz Black: 51mm I.S. disc caliper mounts, 180mm max rotor size; Mint Green and Ops: 51mm IS disc mounts front and rear
- Braze-ons/extras: High-Viz Black: Dual bottle-mounts on XS–M, three bottle-mounts on LG–XL, dropper post routing, rack and fender mounts; Mint Green and Ops: Dual water bottle mounts, Surly Trip Guides for continuous brake and derailleur housing
- Seatpost Diameter: High-Viz Black: 30.9mm; Mint Green and Ops: 27.2mm
- Seatpost Clamp Diameter: High-Viz Black: 33.1mm (Surly stainless included); Mint Green and Ops: 30.0mm (Surly stainless included)
- Headset/Steerer Tube: High-Viz Black: 44mm; Mint Green: Cane Creek 40 for 44mm, 1-1/8˝ threadless. Black; Ops: 44mm ID. Recommend EC44 lower cups. Zero Stack on top is OK
- Front Derailleur Clamp Diameter: High-Viz Black: 34.9mm, high direct-mount; Mint Green: 28.6mm (high-direct); Ops: 28.6mm (high-direct) adaptor included
- Bottom Bracket Shell: High-Viz Black: 73mm; Mint Green and Ops: 73mm wide, standard English threading (1.37˝ x 24t)
- Chainring Clearance: High-Viz Black: 32t Boost 1x, 24/36t Boost 2x, 28t 1x, 24/34t 2x; Mint Green and Ops: 24/36/48t
- Tire Clearance: High-Viz Black: 27.5 x 3.0" and 29 x 2.5", individual tire and rim combos affect tire clearance; Mint Green: 29 x 2.5" knobbies. Individual tire and rim combos affect tire clearance; Ops: 29 x 2.55" knobbies. Individual tire and rim combos affect tire clearance
- Fork: High-Viz Black: 140mm travel suspension fork compatible (547mm A-to-C max); Mint Green: 1-1/8" straight steerer, suspension-corrected (80mm), tapered and butted straight blade, 4130 CroMoly. 51mm IS disc mount; Ops: 1-1/8 to 1.5 tapered steerer, Fox Float, 32mm 100mm travel; 15mm thru-axle mount
- Thru Axle: HU0138 Surly 15x110 Front Thru Axle; HU0134 Surly 12x142/148 Rear Thru Axle
- Colors: High-Viz Black; Mint Green; Spray Tan