Surly Karate Monkey
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Surly Karate Monkey Surly Karate Monkey Surly Karate Monkey Surly Karate Monkey

Surly Karate Monkey

Product Code BKAMKM310
Other products by Surly


    NOTE: Price applies to Online sales only, pricing may differ in our Retail store.
  • In-store: Expect delivery in 2-3 days.
  • Available to Order: With our Supplier, expect delivery in 4-7 days.
  • This item comes with free shipping.


Years ago the Karate Monkey helped start the 29” wheel movement and, as time’s gone by, many companies ­– Surly included – have experimented with even more wheel sizes.

With so many different types and sizes of tires now on the market, riders have begun to understand the effect that tire width has on overall wheel diameter, and with ample tire clearance, you can see the benefits of multiple wheel sizes all on one bike. 27+ tires have the same rolling diameter as a 29” wheel, yet you get all the traction and floatation benefits of extra-wide knobbies. And that’s just the tires.

The Karate Monkey frame has recently gotten a make over that includes the addition of 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 that features Gnot-Boost spacing, which gives the rider the ability to run any kind of mountain bike hub they choose. 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. If, at any point, you decide you want to throw on some skinny meats, standard 29” wheels and tires can be swapped in with no issue. If you want to round-house kick some trail right in the face, the Karate Monkey is your sled.

Frame Horizontal slotted with derailleur hanger, Surly “Gnot Boost” 142 or 148mm hub spacing compatibility
Fork 483mm axle-to-crown x 47mm offset, 110mm hub spacing, tapered and butted straight blade, 4130 CroMoly. 51mm I.S. disc mount
Seatpost clamp Surly stainless, 33.1mm
Crankset SRAM NX 30t
Bottom Bracket SRAM Powerspline
Front Derailleur N/A
Rear Derailleur SRAM Nx
Cog or Cassette Sunrace 11/42
Chain KMC X11-1
Headset Cane Creek
Brakes SRAM Level, 180/160 rotors
Brake Levers SRAM Level
Shifters SRAM Nx
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
Tyres Surly Dirt Wizard 27 x 3"

*Specifications subject to change

Geometry (in) Small Medium Large xLarge
Seat Tube Length
14.5 16.5 18.5 20.5
Top Tube Length
22.4 22.9 23.8 24.8
Effective Top Tube Length
23.0 24.0 25.0 26.0
Head Tube Angle 69.0 69.0 69.0 69.0
Seat Tube Angle 73.0 73.0 73.0 73.0
BB Drop 2.2 2.2 2.2 2.2
Chainstay Length 16.7 16.7 16.7 16.7
Wheelbase 42.4 43.4 44.4 45.5
Standover Height 29.9 30.8 32.0 32.6
Head Tube Length 3.9 3.9 4.3 4.7
Fork Length 19.0 19.0 19.0 19.0
Fork Offset 1.9 1.9 1.9 1.9
Stack 23.5 23.5 23.9 24.2
Reach 15.8 16.8 17.7 18.6

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