The Karate Monkey frame features updated, progressive trail geometry, a new tubeset and Surlys Gnot-Boost rear dropout system to support multiple drivetrain and wheel size configurations.

• 100% Surly 4130 chromoly steel frame and fork; double-butted main triangle and 44mm headtube
• Tubeset uses the same trumpet tubes found on Instigator 2.0 frame
• Adjustable rear dropouts with 145mm Gnot-Boost spacing. Works with 142, 148 12mm thru, as well as 135mm w/ 10/12 washer
• Internal dropper seatpost routing
• 30.9mm seat tube ID
• Clearance for 29 x 2.55 or 27.5 x 3 tires