My Cart


Surly Karate Monkey, Hi-Viz Black Mountain Bike - 2018

Surly Karate Monkey 27.5+ Bike XL Hi-Viz Black_image
Surly Karate Monkey, Hi-Viz Black Mountain Bike - 2018
Surly Karate Monkey, Hi-Viz Black Mountain Bike - 2018
Surly Karate Monkey, Hi-Viz Black Mountain Bike - 2018
Surly Karate Monkey, Hi-Viz Black Mountain Bike - 2018
$ 1,550.00

Karate Monkey delivers a resilient, lively ride on all sorts of gnarly terrain. Its frame is a highly-versatile canvas for whatever dirty masterpiece your brain cooks up. According to Surly's computing machine (Thor) it can be set up in approximately 487 different configurations.

Originally designed as a 29er (and the frame that helped spark the 29” wheel movement), the latest Karate Monkey is designed to perform just as admirably as a 27.5+ rig as well. This allows you to pick your poison — provided your poison is having a really great time while permanently donning a shit-eating grin, of course.

  • Modern trail standards: dropper post compatibility, 44mm headtube, Gnot-Boost rear spacing, thru-axles, suspension corrected fork
  • Compatibility with most mountain bike standards makes it the perfect parts bin bike (no rim brakes allowed though)
  • Clearance for 29” x 2.5” or 27.5” x 3” tires

The Karate Monkey is amazing on singletrack, bomber for bikepacking, works as a commuter, and don't forget the flexible tire clearance.

Surly Bikes from Gravity Coalition are available for in-store pickup.  Contact us with any questions.


Frame Surly 4130 Chromoly Steel
Fork Surly 4130 Chromoly Steel
Seatpost Clamp Surly stainless, 33.1mm


Headset Cane Creek
Brakes SRAM Level
Brake Levers SRAM Level
Rotors SRAM Centerline 180/160
Grips Velo single lock-on
Shifters SRAM NX
Stem Promax, 31.8mm
Handlebar Salsa Rustler 31.8mm
Saddle WTB Volt Sport
Seatpost Promax 30.9mm


Crankset SRAM NX 30t
Bottom Bracket SRAM Power Spline
Front Derailleur None
Rear Derailleur SRAM NX
Cog or cogset Sunrace 11 speed 11-42t
Chain KMC X11EL-1


Front Hub Novatec, 32h, Thru-Axle
Rear Hub Novatec, 32h, Thru-Axle
Rims WTB Scrapper i40 TCS
Tires Surly Dirt Wizard 27 x 3, 60 tpi


Karate Monkey 27.5+ Geometry
Reach 14.8 15.8 16.8 17.7 18.6
Stack 23.5 23.5 23.5 23.9 24.2
Head Tube Angle 69.0° 69.0° 69.0° 69.0° 69.0°
Head Tube Length 3.9 3.9 3.9 4.3 4.7
Seat Tube Length 13.0 14.5 16.5 18.5 20.5
BB Drop 2.2 2.2 2.2 2.2 2.2
Wheelbase 41.5 42.4 43.4 44.4 45.5
Chainstay Length 16.7 16.7 16.7 16.7 16.7
Top Tube Length, Actual 21.6 22.1 22.6 23.5 24.6
Top Tube Length, Effective 22.0 23.0 24.0 25.0 26.0
Seat Tube Angle 73.0° 73.0° 73.0° 73.0° 73.0°
Standover Height 29.3 29.9 30.8 32.0 32.6
Fork Length 19.0 19.0 19.0 19.0 19.0
Fork Rake 1.9 1.9 1.9 1.9 1.9



Frame Construction

4130 Chromoly, Natch tubing, double-butted main triangle, trumpet flaired tubes, TIG welded, ED coated

Fork Construction

4130 Chromoly, Natch tubing, double-butted tapered fork blades, TIG welded, ED coated

Rear Dropout Configuration

Horizontal slotted with optional vertical dumpout

Rear Hub Spacing

"Gnot-Boost" 145mm
12 x 142mm or 12 x 148mm (Surly axle included)
10 x 135mm with Surly 10/12 Adapter Washers (not included)

Front Hub Spacing

15 x 110mm (Surly axle included)

Rear Brake

Disc - 51mm I.S. (203mm max rotor)

Front Brake

Disc - 51mm I.S. (203mm max rotor)

Head Tube


Steerer Tube

Ø28.6mm (1-1/8")

Crown Race

Ø30mm (1-1/8")

Stock Headset Upper (S.H.I.S)


Stock Headset Lower (S.H.I.S)


Seat Collar




Front Derailleur (Clamp)

High direct mount top-pull (Ø34.9mm)
26mm offset adapter (not included) for 142 or 135mm rear hub spacing
29mm offset adapter (not included) for 148mm rear hub spacing

Max Chainring (CL) [3]

1x (Mtn):  28T
2x (Mtn):  24/34T
1x (Boost):  32T
2x (Boost):  24/36T

Bottom Bracket

73mm threaded (1.37" x 24TPI)

Tire Clearance Frame [1]/[2]

27.5 x 3.0”
29 x 2.5"

Tire Clearance Fork [1]

29 x 3.0”

Rigid Fork Spec

483 x 47mm

Max Suspension Fork Length [4]

551 x 51mm (27.5+ 140mm)

Bottle Mounts Frame

1 Standard + 1 Three-Pack (XS - M)
2 Standard + 1 Three-Pack (L - XL)

Bottle Mounts Fork

2 Three-Pack

Rack Mounts Frame

Yes (upper and lower threaded)

Rack Mounts Fork

Yes (upper, lower, and mid-blade threaded)

Fender Mounts Frame


Welcome to the Gravity Coalition!

Your Local Run+Ride Shop. 269 E Main Street Midway Utah.