A versatile hardtail mountain bike

Originally designed as a 29er (and the frame that helped spark the 29” wheel movement), the latest Karate Monkey is also designed to perform just as admirably as a 27.5+ rig. 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.

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The Karate Monkey features updated, progressive trail geometry, Surly's custom trumpet tubeset, and Surly's Gnot-Boost rear dropout system. Available in a variety of colors, with multiple drivetrain and wheel size configurations.

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.

Price and availability

For current inventory, pricing, and promotions on bicycles and frames, visit the Sales and Inventory page.

Other Surly models and galleries:

Surly Ice Cream Truck

Surly Krampus

Surly Lowside

Surly Midnight Special

Surly Karate Monkey features and specs:

100% Surly Chromoly steel frame and fork (fully rigid option); double-butted main triangle and 44mm headtube
The tubeset uses the same trumpet tubes found on Instigator 2.0 frame for greater stiffness and durability
Adjustable rear dropouts with 145mm Gnot-Boost spacing. Works with 142, 148 12mm thru, as well as 135mm w/ 10/12 washer
Available RockShox 35 Gold RL A2 suspension fork with 140mm travel
Available TranzX YSP15 dropper post with stealth routing; 100mm travel on XS, 120mm travel on SM-XL
Internal dropper seatpost routing with 30.9mm seat tube ID
Clearance for 29 x 2.55" or 27.5 x 3" tires

Surly Karate Monkey Customer Gallery

David decided on this cool Surly Karate Monkey after some research

Nick picked an ideal bike for him - a fun and capable Surly Karate Monkey

Robert picks up a new Surly Karate Monkey frame

Emile was looking for a bike that can hit trails, bikepacking, the roads, fire roads and of course have lots of fun. Surly Karate Monkey OPS fits the bill.