Surly Karate Monkey 27.5+ Complete Bike - The Karate Monkey is all-new for 2017. Complete bikes available in two different wheel size options, featuring updated, progressive trail geometry, a new tubeset, and many other new features. 100% Surly 4130 chromoly steel frame and fork; double-butted main triangle and 44mm headtube New 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