Surly Karate Monkey SS


The Karate Monkey helped set the standard for 29er geometry. While its tucked-in rear wheel keeps it nimble and maneuverable, while here in its single speed configuration, its lack of shifting componentry keeps the bike simple — and the rider filled with a cathartic rage. 

The SS version is a good choice if you are looking to run your Karate Monkey as a 29er - it comes ready with Alex MD25 29" rims and a cassette ready freehub, to take your gears if you so with it.

Keep it stock for a rattle free riot of a ride, or use it as your base for customisation - gear it up for touring (the KM frame has braze-ons for racks, fenders and multiple bottle cages including fork mounts), or bikepacking with your choice of derailleur (1x or 2x) or gear hub. Ask us about build options.


  • Tubing Surly 4130 CroMoly Steel ‘Natch tubing
  • Rear Dropouts Horizontal slotted with derailleur hanger; Surly “Gnot Boost” 135, 142, or 148mm hub spacing compatibility, threaded fender eyelets
  • Brake Compatibility 51mm I.S. disc caliper mounts, 180mm max rotor size
  • Braze-ons/extras Dual bottle-mounts on XS–M, three bottle-mounts on LG–XL, dropper post routing, rack and fender mounts
  • Seatpost diameter 30.9mm Seatpost clamp diameter / 33.1mm (Surly stainless included)
  • Headset/Steerer Tube 44mm
  • Front Derailleur Clamp Diameter 34.9mm, high direct-mount
  • Bottom bracket shell 73mm
  • Chainring Clearance 32t Boost 1x, 24/36t Boost 2x, 28t 1x, 24/34t 2x
  • Tire Clearance 27.5 x 3.0˝ and 29 x 2.5˝, individual tire and rim combos affect tire clearance
  • Fork 140mm travel suspension fork compatible (547mm A-to-C max)
  • Thru Axle HU0138 Surly 15x110 Front Thru Axle
    HU0134 Surly 12x142/148 Rear Thru Axle
  • Color Stand Back Purple, Hi-Viz Black (Frameset Only)/li>


  • Frame Horizontal slotted with derailleur hanger; Surly “Gnot Boost” 135, 142, and/or 148mm hub spacing compatibility
  • Fork 483mm axle-to-crown x 47mm offset, 110mm hub spacing, tapered and butted straight blade, 4130 CroMoly. 51mmI.S. disc mount
  • Seatpost Clamp Surly stainless, 33.1mm
  • Crankset SRAM Nx 30t
  • Bottom Bracket SRAM Powerspline
  • Front derailleur None
  • Rear derailleur None
  • Cog or cogset Surly 17t cog w/Surly spacer kit
  • Chain KMC X11
  • Headset Cane Creek
  • Brakes SRAM Nx
  • Brake levers SRAM Level
  • Shifters None
  • Stem H.L. 4-bolt, 31.8mm
  • Handlebar Answer Pro Taper
  • Saddle WTB Volt Sport
  • Seatpost H.L. 30.9mm
  • Front hub Salsa 110mm, 15mm thru-axle, 32h
  • Rear hub Salsa 148mm, 12mm thru-axle, 32h
  • Rims Alex MD40
  • Tires Maxxis Ardent 29 x 2.4, 60 tpi


S, M, L, XL.



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