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In West Newton Since 1952 - On The Web Since 1995
The Surly Karate Monkey ®
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The Karate Monkeyª is all about big wheels and versatility. Build it up as a 700c mountain bike, cyclocross bike, commuter, or backcountry tourer. Create your ideal Frankenstein.
Surly decided to produce a 29er, because they thought they could make improvements on the current designs from other manufacturers, while offering a unique, quality frameset at a Surly price. Mission accomplished.
Frameset geometry is the key to the handling characteristics of any bike. It doesn't matter how pretty it is, or how many braze-ons it has, if it rides like crap. We want you to use the Karate Monkey on singletrack, as well as fire roads and pavement, so we spent a large amount of time figuring out the best ways to make our rig handle like a mountain bikeÉnot like a tractor. The most obvious frame component, of the Karate Monkey, is the curved seat tube. This feature allows us to use shorter chainstays without worrying about the rear tire rubbing on the seat tube, when the wheel is jammed all the way foreword in the fork ends. Shorter chainstays mean quicker handling and better traction at the rear. Toe overlap is another concern with big-wheeled bikes. We tweaked our measurements to eliminate overlap, while maintaining the riding characteristics of a mountain bike.
Options galore. Single-speed? Sure. Fixed-gear? No problem. Like gears? Use some. The Karate Monkey will accommodate a standard or compact mountain triple, up front, and a cassette full o'cogs in the 135 mm-spaced rear. The Surly horizontal rear fork ends are cast with a derailer hanger, so you have several drivetrain options.This frame is also ideal for use with internal gear hubs, such as the Shimano Nexus or SRAM Spectro 7-speed or the Rohloff Speedhub 14 speed!
Disc brakes or cantilevers? Once again, it's up to you. The Karate Monkey comes with International Standard disc mounts and removable canti pivots.
Rigid or suspended front end? We provide a unicrown, tapered straight blade, suspension-corrected rigid fork. Do as you wish.
If you go with the disc brake option, you can have multiple wheelsets, even different sizes. How 'bout 26" slicks for touring, or silk tubulars for time trials, when you're not burning up the trails on your 29 inch knobbies!
Like all Surly frames and forks, the Karate Monkey is built with Surly 4130 Chromo. The butted tubes are thick enough to withstand a derby circle beating, but thin enough to deliver the fine ride characteristics that steel is known for.
Want a trail-worthy, high roller that won't put you in the poor house? Check out the Karate Monkeyª
How crazy can you get with a Karate Monkey?
Click here to see!Features:
Tubing:
100% Surly 4130 Cro-moly steel. Main triangle double-butted. TIG welded.
Rear fork ends:
Surly horizontal fork ends with derailer hanger. 135 mm spaced
Brake compatibility:
International Standard disc or cantilever rim-type
Braze-ons:
Cantilever bosses with removable pivots, dual water bottle mounts, down tube shift cable routing, tube guides for hydraulic hose or solid housing on the seatstay, standard cable housing stops on the top tube. Fender eyelets front and rear.
Seatpost diameter:
27.2mm
Seatpost clamp diameter:
30.0 mm Surly Constrictor™ included.
Headset:
1 1/8” threadless.
Front derailer:
28.6 mm clamp diameter
Bottom bracket shell:
73 mm wide, 1.37x24t.
Chainring Clearance:
48t max
Fork:
Suspension-corrected, tapered straight blade, 4130 cro-moly. International Standard disc mount and removable canti pivots
Sizes available:
16", 18", 20" and 22" measured from the center of the bottom bracket to the top of the top tube
Color:
Blue or Black
Price:
$450
FRAME & FORK:
4130 CroMo (‘natch), main tubes butted. The fork is externally tapered, internally butted, straight blade, 43 mm rake. Frame and fork are suspension corrected for 85 mm travel (modeled on Marzocchi 29" sus. fork ).DISC MOUNTS:
Both front and rear are 51mm int’l standard, but the rear is funky. Remember that the rear dropouts are rear loading horizontal, so the rear disc tab has slotted holes to allow proper placement of the caliper on the rotor. One catch here is that some do not work. Most do, but the ones we know for sure that do not are Deore mechanicals (the adapter interferes with the adjustable mount) and Formula B4 SL mag.RUNNING GEARS:
REAR: for proper shifting with a rear derailer, the wheel should be all the way forward in the axle slot. This will put the cassette in the proper place for good shifting, plus the wheel won’t be able to pull forward.
FRONT: Clamp size is 28.6 mm. Cable routing is bottom pull. derailer type should be traditional, NOT top swing. Due to the KM's relatively short stays, top swing ders. will not allow enough room for the cable fixing bolt.BRAZE ONS:
KM has cable stops and hydro housing guides. Also single eyelets at drops for fenders or rack.
IMPORTANT: if using disc brakes, you will not be able to use these eyelets, and so need to use clip on fenders and/or a seat post mounted rackFrame Geometry
Small
Medium
Large
X-Large Seat Tube
Inches mm
(Center to Top)16.0
406.418.0
457.220.0
508.022.0
558.8Top Tube
Inches mm
(Center to Center)21.7
552.022.6
574.523.4
594.524.2
614.3Top Tube
Inches mm
(Effective)22.7
576.623.6
600.624.3
617.524.9
633.6Head Tube Angle
degrees71.0°
71.5°
72.0°
72.0°
Seat Tube Angle
degrees73.0°
73.0°
73.0°
73.0°
Bottom Bracket Drop
Inches mm2.7
68.02.7
68.02.7
68.02.7
68.0Chainstay Length
Inches mm16.8
426.016.8
426.016.8
426.016.8
426.0Wheel Base
Inches mm40.9
1039.941.7
1059.042.2
1071.142.2
1073.0Front-Center
Inches mm24.5
623.025.3
642.025.7
654.026.4
670.0Head Tube Length
Inches mm3.1
80.03.5
90.03.7
95.04.1
105.0Fork Length
Inches mm18.4
468.018.4
468.018.4
468.018.4
468.0Fork Rake
Inches mm1.7
43.01.7
43.01.7
43.01.7
43.0Surly Cross-Check cyclocross frames and complete bikes
The Surly 1 X 1 Singlespeed MTB
The Surly Karate Monkey 29 inch do everything frame
The Surly Long Haul Trucker touring frame
The Surly Pugsley go everywhere frame
The Surly Steamroller fixed-gear road frame.
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