Surly Karate Monkey 27.5" Hardtail Mountain Bike (High Fiber Green)

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Price: $2,299.00
Discontinued Online
This item is discontinued and no longer available for purchase. You may want to search our site for a similar item.

The Karate Monkey Front Suspension bike features a Rock Shox 35 Gold RL A2 suspension fork with 140mm travel, and it’s paired with a dropper post out the box. Progressive trail geometry and Surly’s Gnot-Boost rear dropout system deliver a versatile bike with the ability to swap hubs and wheel sizes. If you want to round-house kick some trail right in the face, the Karate Monkey is your sled.


  • 100% Surly Chromoly steel frame, double-butted main triangle and 44mm headtube
  • The tubeset uses Surly custom trumpet tubes for greater stiffness and durability
  • Adjustable rear dropouts with 145mm Gnot-Boost spacing. Works with 142 and 148 x 12mm thru, as well as 135mm w/ 10/12 washer
  • Rock Shox 35 Gold RL A2 suspension fork with 140mm travel
  • TranzX SP15 dropper post with stealth routing; 100mm travel on XS/SM 120mm travel on MD/LG/XL
  • Clearance for 27.5 x 3 or 29 x 2.55" tires 
Platform: Karate Monkey
Frame Type: Hardtail
Frame Material: Steel
Color: High Fiber Green
Wheel Size: 27.5+
Fork Type: Suspension
Brake Type: Disc
Front Axle: 15mm Thru x 110mm
Rear Axle: 12mm Thru x 148mm
TT (Effective): 590  

Bike Build:
Frame: 100% Surly Chromoly Steel. Custom double-butted, externally flared tubing. Horizontal slotted with derailleur hanger, Surly “Gnot Boost” 142 or 148mm hub spacing compatibility.
Fork: RockShox 35 Gold RL, 27.5 - 140mm travel, 44mm offset, 15 x 110mm Axle, disc
Crankset: Shimano Deore FC-M6100-1, 30t
Bottom Bracket: Shimano, included with crankset
Front Derailleur: N/A
Rear Derailleur: Shimano Deore XT, RD-M8100, 12-speed
Cassette / Cog: SunRace CSMZ800, 11-51t, 12-Speed
Chain: KMC X12 NP/BK
Grips: Velo lock-on
Handlebar: Salsa Rustler without logo
Stem: ProMax, 31.8
Headset: Cane Creek 15
Shifter: Shimano Deore XT, SL-M8100
Brakes: Tektro Gemini HD-M520 , 180mm front & 160mm rear
Saddle: WTB Volt 142
Seatclamp: 33.1mm Surly Stainless
Seatpost: TranzX SP15, dropper post 120mm travel, 30.9
Front Hub: 110mm, Novatec, 32h, Thru-Axle
Rear Hub: 148mm, Novatec, 32h, Thru-Axle
Rims: WTB ST i35 TCS
Tires: Surly Dirt Wizard 27 x 2.8", 60tpi Tubeless Ready
Tubes: included  
Pedals: *Not included

 *Note: These bikes are fully built by our expert bike builders, then partially disassembled as needed for shipping. Bikes will arrive to you with some basic assembly still required.  

This product was added to our catalog on December 14, 2020

Verified Owner
Thursday, Feb 11 2021 (9 months ago)
Surly Karate Monkey 27.5" Hardtail Mountain Bike (High Fiber Green) (S)
A solid bike build that’s versatile and suits my needs (trail/fireroad/single-track) just right. The heavy Surly steel may not be choice for everyone, but it does offer a smooth ride for those who do not mind the weight. I’m happy with my ride!

Everybody have fun out there!
Monday, Jan 4 2021 (11 months ago)
Surly Karate Monkey 27.5" Hardtail Mountain Bike (High Fiber Green) (L)
My Surly Karate Monkey satisfies my needs perfectly. I am in my late 60s. Shredding, wild jumps, fantastic maneuvers and stunts is not what I do. I wanted a well made, decently equipped, steel bike, so I looked to Surly. The Karate Monkey is my third Surly.

I ride exclusively on dirt roads--soft, loose sand, deep ruts, rock-strewn trails, hard pack, washboard, undulating paths, and zigzagging animal trails. The wide gearing allows me to easily climb 10 percent sandy ascents. The steel frame is solid and gives me confidence when I am descending. The fork absorbs hits from dips and ruts. The big 2.8 Dirt Wizards keep me going forward on long stretches of sandy desert washes. I like hearing the tires roll over the rocks of railroad service roads. Nothing stops my Surly.

My Karate Monkey helps me maintain good fitness. My rides range from 10 to 15 miles. I feel young again when I am cruising along at 12-15 mph. I like pulling up under a shady Joshua Tree for lunch knowing that I am miles from home and got there under my own power.

I am 5' 10" with a 33.5" inseam. My Karate Monkey is a medium and weighs 34 pounds 12 ounces equipped with two water bottle cages and inexpensive flat pedals. I use tubes. Each Dirt Wizard 27.5 x 2.8 tire weighs 2.47 pounds/1115g. The tubes weigh .77 lbs./349g each. I have not changed components. The stock handlebar grips are too hard for me, so I will install softer, ergonomic grips.

Assembly took me five minutes. The only complaint I have is that the front wheel was not true. I had my LBS true the wheel.