Surly Karate Monkey Front Suspension

Name: Surly Karate Monkey Front Suspension
Brand: Surly

2025 MountainTrail Manufacturer page

Last known price: $2,599

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

Rider height by size (cm)

Size guide

XS 145–160
SM 155–170
MD 165–180
LG 175–191
XL 185–201

Components

16 of 20 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

Surly Karate Monkey - 4130 Chromoly, Natch tubing, double-butted main triangle, trumpet flared tubes, TIG welded, ED coated Not identified

Suspension

1 part

Fork
- RockShox 35 Gold RL

Drivetrain

7 parts

Bottom bracket

73mm threaded (1.37" x 24TPI) Not identified
Cassette
- SunRace 11–51t
Chain
- KMC
Crankset
- Shimano FC-MT511 12 speeds 30t
FC-MT511
Front derailleur

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

Brakes

3 parts

Brake levers
- Tektro Gemini
HD-M3520
Brakes
- Tektro Gemini
HD-M3520
Disc rotors

Disc - 51mm I.S. (203mm max rotor) Not identified

Wheels and tires

4 parts

Cockpit and contact points

5 parts

Handlebar
- Salsa
Headset
- Cane Creek
Saddle
- WTB Volt
Seatpost

Ø30.9mm Not identified
Stem
- ProMax
DA-296

Sizes and geometry

5 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 421mm

Stack 602mm

Wheelbase 1107mm

Head angle 68.0°

Seat angle 72.0°

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
Frame
Reachmm	371	396	421	443	466
Stackmm	601	601	602	611	621
Top tube lengthmm	562	587	612	637	662
Seat tube lengthmm	330	368	419	470	521
Head tube lengthmm	100	100	100	110	120
Head tube angle	68°	68°	68°	68°	68°
Seat tube angle	72°	72°	72°	72°	72°
Chainstay lengthmm	423	423	423	423	423
Wheelbasemm	1057	1082	1107	1132	1158
Front centermm	639	664	689	714	740
Bottom bracket dropmm	51	51	51	51	51
Bottom bracket heightmm	304	304	304	304	304
Standover heightmm	751	769	791	819	848
Fork rakemm	44	44	44	44	44
Trailmm	99	99	100	100	102
Stack/reach ratio	1.62	1.52	1.43	1.38	1.33
Suspension and parts
Crank lengthmm	170	170	175	175	175
Handlebar widthmm	750	750	800	800	800
Stem lengthmm	60	70	70	70	80

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

Specifications

Frame and fork

Intended fit: Unisex
Frame 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: 16.2 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

Bottom bracket standard: BSA
Fork spring: Air
Tire width: 2.8″
Wheel material: Aluminum
Wheel size: 27.5″

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: 2025
Sample: 1,810 bicycles with this information
Coverage: 97.5% of the class

Lowest gear

16.2 gear inches

This value is below the central range for this class.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,384 bicycles with this information
Coverage: 74.6% of the class

Highest gear

75.0 gear inches

This value is below the central range for this class.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,384 bicycles with this information
Coverage: 74.6% of the class

Shifting

Mechanical

388 of 1,849 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,849 bicycles with this information
Coverage: 99.6% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.2 km/h
Highest gear: 28.7 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: 16.2–75.0 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: 2025
Lowest gear: 1384 bicycles with this information, 74.6% of the class
Highest gear: 1384 bicycles with this information, 74.6% 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.

Differences across 2025 builds

Differences across 2025 builds
Specification	This bicycle Surly Karate Monkey Front Suspension	Surly Karate Monkey
Frame
Fork material	Not informed	Steel
Suspension
Suspension configuration	Hardtail	Rigid
Front travel	140 mm	Not informed
Other specifications
Fork spring	Air	Not informed
Suspension	Hardtail	Rigid
Tire width	2.8″	3″