Surly Karate Monkey

Name: Surly Karate Monkey
Brand: Surly

2020 MountainTrail

Last known price: $2,299

Prices shown first for United States
Fork travel: 140 mm
Wheels: 27.5″, 29″
Drivetrain: 1 × 12 30t / 11–51t
Gear range: 464%
Frame: Steel
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

XS 156–166
XS 156–166
SM 163–174
SM 163–174
MD 171–182
MD 171–182
LG 179–189
LG 179–189
XL 185–195
XL 185–195

Components

19 of 21 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Frame and fork

1 part

Frame

100% Surly Chromoly Steel. Custom double butted externally flaired tubing. Horizontal slotted with derailleur hanger, Surly “Gnot Boost” 142 or 148mm hub spacing compatibility Not identified

Suspension

1 part

Fork
- RockShox 35 Gold RL

Drivetrain

7 parts

Bottom bracket
- Shimano
Cassette
- SunRace 11–51t
Chain
- KMC
Crankset
- Shimano Deore FC-M6100-1 12 speeds 30t
FC-M6100
Front derailleur

None
Rear derailleur
- Shimano Deore XT RD-M8100 12 speeds
RD-M8100
Shifters
- Shimano Deore XT SL-M8100
SL-M8100

Brakes

3 parts

Wheels and tires

4 parts

Cockpit and contact points

6 parts

Grips

Velo - lock on Not identified
Handlebar
- Salsa
Headset
- Cane Creek
Saddle
- WTB Volt
Seatpost
- Tranz-X
Stem
- ProMax

Sizes and geometry

10 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 412mm

Stack 608mm

Wheelbase 1121mm

Head angle 67.5°

Seat angle 71.5°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 27.5″ wheel; exact published values are in the table below.

Size Reported by the manufacturer

Complete manufacturer geometry table 10 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	361	361	387	387	412	412	434	434	457	457
Stackmm	607	607	607	607	608	608	617	617	627	627
Top tube lengthmm	565	565	590	590	615	615	640	640	665	665
Seat tube lengthmm	330	330	368	368	419	419	470	470	521	521
Head tube lengthmm	100	100	100	100	100	100	110	110	120	120
Head tube angle	67.5°	67.5°	67.5°	67.5°	67.5°	67.5°	67.5°	67.5°	67.5°	67.5°
Seat tube angle	71.5°	71.5°	71.5°	71.5°	71.5°	71.5°	71.5°	71.5°	71.5°	71.5°
Chainstay lengthmm	423	423	423	423	423	423	423	423	423	423
Wheelbasemm	1071	1071	1096	1096	1121	1121	1147	1147	1172	1172
Front centermm	652	652	677	677	702	702	728	728	753	753
Bottom bracket dropmm	44	44	44	44	44	44	44	44	44	44
Bottom bracket heightmm	311	330	311	330	311	330	311	330	311	330
Standover heightmm	757	757	775	775	797	797	826	826	855	855
Fork rakemm	51	51	51	51	51	51	51	51	51	51
Trailmm	91	99	92	100	92	100	92	100	94	102
Stack/reach ratio	1.68	1.68	1.57	1.57	1.48	1.48	1.42	1.42	1.37	1.37
Suspension and parts
Crank lengthmm	170	170	170	170	175	175	175	175	175	175
Handlebar widthmm	750	750	750	750	800	800	800	800	800	800
Stem lengthmm	60	60	70	70	70	70	70	70	80	80
Stem angle	7°	7°	7°	7°	7°	7°	7°	7°	7°	7°

Not published by the manufacturer: Front travel, Rear travel, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Steel
Fork material: Steel

Suspension

Suspension configuration: Hardtail
Front travel: 140 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 30
Largest chainring: 30
Rear sprockets: 12
Smallest sprocket: 11
Largest sprocket: 51
Lowest gear: 17.1 in
Highest gear: 79.1 in

Wheels and brakes

Wheel configuration: Wheel options
Brake type: Hydraulic disc

Fit and controls

Seatpost: Dropper seatpost
Shifting: Mechanical

Additional specifications

Fork spring: Air
Tire clearance: Maximum tire width: 2.5″
Tire width: 2.8″
Wheel material: Aluminum
Wheel size: 27.5″, 29″

Technical analysis

4 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Front travel

140 mm

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2020
Sample: 1,348 bicycles with this information
Coverage: 93.8% of the class

Lowest gear

17.1 gear inches

This value is below the central range for this class.

Cohort: Mountain / Trail Model year: 2020
Sample: 1,217 bicycles with this information
Coverage: 84.6% of the class

Highest gear

79.1 gear inches

This value is below the central range for this class.

Cohort: Mountain / Trail Model year: 2020
Sample: 1,217 bicycles with this information
Coverage: 84.6% of the class

Shifting

Mechanical

55 of 1,437 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2020
Sample: 1,437 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.5 km/h
Highest gear: 30.3 km/h

Total gear range 464%

Technical details and class reference

These speeds describe the gearing at the selected cadence, not how fast you can ride.
Calculated from published gear-inch values and their wheel-size assumptions.
These gearing values describe the bicycle, not a selected frame size.
A 100% range means one ratio; 500% means the highest ratio is five times the lowest.
For e-bikes, motor assistance cutoff is not represented.

Gear-inch range

Lower gear-inch values travel less distance per pedal revolution; higher values travel farther.

This bicycle: 17.1–79.1 gear inches
Class reference (p10–p90): 17.1–98.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Trail Model year: 2020
Lowest gear: 1217 bicycles with this information, 84.6% of the class
Highest gear: 1217 bicycles with this information, 84.6% of the class

Lineup changes

The published facts that differ across this family's builds and from the same model a year earlier. Missing information never counts as zero.

Changes since 2019

Changes since 2019
Specification	2019 Surly Karate Monkey	This bicycle Surly Karate Monkey
Suspension
Suspension configuration	Rigid	Hardtail
Front travel	Not informed	140 mm
Drivetrain
Rear sprockets	11	12
Largest sprocket	42	51
Lowest gear	20.7 in	17.1 in
Cockpit
Seatpost	Rigid seatpost	Dropper seatpost
Other specifications
Suspension	Rigid	Hardtail
Tire width	3″	2.8″
Fork spring	Not informed	Air