Surly Karate Monkey Bike - 27.5”, Steel, Organic Eggplant

$1,849.00 USD
Size: S
free delivery and build with velofix
🇺🇸 Available for purchase in US only.
🇨🇦 Based in Canada? Click here to contact us for availability.

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

• 100% Surly Chromoly steel frame and fork; double-butted main triangle and 44mm headtube
• The 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 with 30.9mm seat tube ID
• Clearance for 29 x 2.55 or 27.5 x 3 tires


Bike CategoryMountain


Frame100% Surly Chromoly Steel, Natch tubing, double-butted main triangle, trumpet flared tubes, TIG welded, E.D. coated
Fork100% Surly Chromoly Steel, Natch tubing, double-butted tapered fork blades, TIG welded, E.D. coated

Front Set

HeadsetCane Creek
StemKalloy 31.8
HandlebarsSalsa Rustler
Bar TapeVelo Black


Rear DerailleurShimano Deore 6100 SGS
CassetteOE 12-spd, 11-51t
CranksetShimano Deore MT510, 30t
ChainKMC X12 Anti-Rust
Shift LeversShimano Deore 12-spd


BrakesSRAM Avid BB5 Mechanical, 180mm front & 160mm rear
Shift/Brake LeversSRAM Avid FR5


SaddleSelle Italia


WheelsetWTB ST i40 TCS 2.0
Tires/TubesSurly Dirt Wizard 27.5 x 3", 60tpi, Tubeless Ready

Size GuideXS SMLXL
ASeat Tube Length 330mm 368mm 419mm 470mm 521mm
BTop Tube 560mm 585mm 610mm 635mm 660mm
CHead Tube Angle 68.3° 68.4° 68.4° 68.4° 68.4°
DSeat Tube Angle 72.3° 72.4° 72.4° 72.4° 72.4°
EHead Tube 100mm 100mm 100mm 110mm 120mm
FReach 414.5mm 429.3mm 445.3mm 461mm 477mm
GStack 601mm 601mm 601mm 611mm 621mm
HWheelbase 1064mm 1089mm 1114mm 1140mm 1166mm
IBB Drop 50mm 50mm 50mm 50mm 50mm
KStandover Height 749mm 766mm 788mm 817mm 846mm