Surly Karate Monkey 27.5+

Name: Surly Karate Monkey 27.5+
Brand: Surly

2018 MountainTrail Manufacturer page

Suspension: Rigid
Wheels: 27.5″
Drivetrain: 1 × 11 30t / 11–42t
Gear range: 382%
Frame: Steel
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

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

Components

16 of 19 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

Horizontal slotted with derailleur hanger, Surly “Gnot Boost” 142 or 148mm hub spacing compatibility Not identified

Suspension

1 part

Fork

483mm axle-to-crown x 47mm offset, 110mm hub spacing, tapered and butted straight blade, 4130 CroMoly. 51mm I.S. disc mount Not identified

Drivetrain

7 parts

Bottom bracket

73mm Not identified
Cassette
- SunRace
Chain
- KMC X11 11 speeds
Crankset
- SRAM NX 30t
Front derailleur

None
Rear derailleur
- SRAM NX
Shifters
- SRAM NX

Brakes

2 parts

Wheels and tires

4 parts

Cockpit and contact points

5 parts

Sizes and geometry

5 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 427mm

Stack 597mm

Wheelbase 1103mm

Head angle 69.0°

Seat angle 73.0°

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 5 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	377	402	427	450	472
Stackmm	597	597	597	606	615
Top tube lengthmm	560	585	610	635	660
Seat tube lengthmm	330	368	419	470	521
Head tube lengthmm	100	100	100	110	120
Head tube angle	69°	69°	69°	69°	69°
Seat tube angle	73°	73°	73°	73°	73°
Chainstay lengthmm	423	423	423	423	423
Wheelbasemm	1053	1078	1103	1129	1155
Front centermm	636	661	686	712	738
Bottom bracket dropmm	55	55	55	55	55
Bottom bracket heightmm	300	300	300	300	300
Standover heightmm	743	759	783	812	827
Fork rakemm	47	47	47	47	47
Trailmm	88	88	88	88	88
Stack/reach ratio	1.58	1.49	1.40	1.35	1.30

Not published by the manufacturer: Front travel, Rear travel, Crank length, Handlebar width, Stem length, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

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

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 30
Largest chainring: 30
Rear sprockets: 11
Smallest sprocket: 11
Largest sprocket: 42
Lowest gear: 19.6 in
Highest gear: 75.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Tire clearance: Maximum tire width: 3″
Travel: Front: Additional specification: Not available: Yes
Rear: Additional specification: Not available: Yes
Wheel material: Aluminum
Wheel size: 27.5″

Technical analysis

3 measures

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

Lowest gear

19.6 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2018
Sample: 845 bicycles with this information
Coverage: 90.0% of the class

Highest gear

75.0 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2018
Sample: 845 bicycles with this information
Coverage: 90.0% of the class

Shifting

Mechanical

25 of 938 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2018
Sample: 938 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 7.5 km/h
Highest gear: 28.7 km/h

Total gear range 382%

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: 19.6–75.0 gear inches
Class reference (p10–p90): 16.5–93.5 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Trail Model year: 2018
Lowest gear: 845 bicycles with this information, 90.0% of the class
Highest gear: 845 bicycles with this information, 90.0% 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.

Differences across 2018 builds
Specification	This bicycle Surly Karate Monkey 27.5+	Surly Karate Monkey SS
Drivetrain
Rear sprockets	11	1
Smallest sprocket	11	17
Largest sprocket	42	17
Lowest gear	19.6 in	51.2 in
Highest gear	75.0 in	51.2 in
Brakes
Brake type	Hydraulic disc	Mechanical disc
Wheels
Wheel configuration	Same size	Wheel options
Cockpit
Shifting	Mechanical	No shifting
Other specifications
Wheel size	27.5″	26″ / 29″
Tire width	Not informed	2.4″