2019 Surly Bikes Karate Monkey 27.5+ Rigid Fork

Category
Rigid MTB
Design
Flat Bar, Rigid, suspension corrected
Frame
Steel
Fork
Steel
Features
Disc brake
Somewhat upright stack and reachvs category
Average stack and reachvs category
Average stack and reachvs category
Somewhat aggressive stack and reachvs category
Somewhat aggressive stack and reachvs category

Geometry

XS
SM
MD
LG
XL
Stack
597mm
597mm
597mm
606mm
615mm
Reach
377mm
402mm
427mm
450mm
472mm
Stack to Reach Ratio
1.58:1
1.49:1
1.4:1
1.35:1
1.3:1
Seat Tube Length, C-T
330mm
368mm
419mm
470mm
521mm
Top Tube Length, Effective/Horizontal HT Top
560mm
585mm
610mm
635mm
660mm
Top Tube Length, Actual C-C
557mm
568mm
582mm
604mm
630mm
Top Tube Slope
30.7deg
25.7deg
19.7deg
14.9deg
10.6deg
Head Tube Angle
69deg
69deg
69deg
69deg
69deg
Seat Tube Angle
73deg
73deg
73deg
73deg
73deg
Head Tube Length
100mm
100mm
100mm
110mm
120mm
Bottom Bracket Drop
55mm
55mm
55mm
55mm
55mm
Bottom Bracket Height
319.5mm
319.5mm
319.5mm
319.5mm
319.5mm
Chainstay Length
423mm
423mm
423mm
423mm
423mm
Chainstay Length Horizontal
419.4mm
419.4mm
419.4mm
419.4mm
419.4mm
Front-Center
636mm
660.9mm
685.8mm
711.7mm
737.6mm
Front-Center Horizontal
633.6mm
658.6mm
683.6mm
709.6mm
735.6mm
Wheelbase
1053mm
1078mm
1103mm
1129mm
1155mm
Fork Offset/Rake
47mm
47mm
47mm
47mm
47mm
Fork Length (Axle-To-Crown)
483mm
483mm
483mm
483mm
483mm
Trail
93.4mm
very high
93.4mm
very high
93.4mm
very high
93.4mm
very high
93.4mm
very high
Mechanical Trail
87.2mm
87.2mm
87.2mm
87.2mm
87.2mm
Wheel Flop
31.3mm
31.3mm
31.3mm
31.3mm
31.3mm
Standover Height
743mm
761mm
783mm
811mm
840mm
Tire to Pedal Spindle
96.5mm
165 mm cranks
116.4mm
170 mm cranks
136.3mm
175 mm cranks
162.2mm
175 mm cranks
188.1mm
175 mm cranks
Pedal Spindle to Ground Clearance
154.5mm
165 mm cranks
149.5mm
170 mm cranks
144.5mm
175 mm cranks
144.5mm
175 mm cranks
144.5mm
175 mm cranks

27.5+ Rigid Fork Build

XS
SM
MD
LG
XL
Wheel Size
650B/27.5
584 mm BSD
650B/27.5
584 mm BSD
650B/27.5
584 mm BSD
650B/27.5
584 mm BSD
650B/27.5
584 mm BSD
Tire Width
3in
3in
3in
3in
3in
Tire Outer Diameter
749mm
749mm
749mm
749mm
749mm
Bike Length with Tires
1802mm
1827mm
1852mm
1878mm
1904mm
Crank Length
165mm
170mm
175mm
175mm
175mm
Handlebar Width
750mm
750mm
800mm
800mm
800mm
Stem Length
60mm
70mm
70mm
80mm
80mm

Stack and Reach vs. Category Trend

Very Upright
Somewhat Upright
Average
Somewhat Aggressive
Very Aggressive

The Bike Insights Upright/Aggressive scale is based on analysis of a bike’s proportions relative to similar sized bikes in the same category.

Learn more about the Upright/Aggressive Scale
Category Trend
Rigid MTB
Source:https://surlybikes.com/bikes/karate_monkey/bike_specs