K2 Brass Monkey 4 - 27.5

2015 MountainCross-country

Fork travel: 100 mm
Wheels: 27.5″
Drivetrain: 2 × 10 26–39t / 11–36t
Gear range: 491%
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 158–171
MD 168–180
LG 178–189
XL 186–199

Components

12 of 17 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

27.5"/29” 650B Hardtail X6, Butted Custom Drawn Tubing, 1.5 Tapered Head-Tube, Not identified

Suspension

1 part

Fork
- RockShox 30 Gold TK

Drivetrain

4 parts

Cassette
- SRAM PG-1030 10 speeds 11–36t
PG-1030
Chain
- KMC X10 10 speeds
Crankset
- SRAM 39/26t
Shifters
- SRAM X7

Brakes

1 part

Brakes
- SRAM Guide R

Wheels and tires

4 parts

Front hub

Crucial Alloy Disc w/ QR Not identified
Rear hub

Crucial Alloy Disc Cassette w/ QR Not identified
Spokes

Stainless 14G Black w/ 2 Painted At P/V Not identified
Tires
- Kenda

Cockpit and contact points

6 parts

Grips

Velo Dual Compound Single Clamp Silver Not identified
Handlebar
- Kore
Headset
- Kore
Saddle
- Kore
Seatpost
- Kore
Stem
- Kore

Sizes and geometry

4 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Geometry diagram unavailable

The drawing needs reach and stack, which the manufacturer did not publish. Available facts remain in the table.

Size Reported by the manufacturer

Complete manufacturer geometry table 4 published sizes

Complete manufacturer geometry by size
Measurement
Top tube lengthmm	570	595	620	640
Seat tube lengthmm	380	430	480	530
Head tube lengthmm	110	110	110	125
Head tube angle	69.5°	69.5°	69.5°	69.5°
Seat tube angle	72.5°	72.5°	72.5°	72.5°
Chainstay lengthmm	435	435	435	435
Wheelbasemm	1061.1	1095.7	1120.7	1141.5
Front centermm	630	665	690	710
Bottom bracket dropmm	45	45	45	45
Bottom bracket heightmm	310	310	310	310

Not published by the manufacturer: Reach, Stack, Standover height, Fork rake, Trail, Stack/reach ratio, 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: Aluminum

Suspension

Suspension configuration: Hardtail
Front travel: 100 mm

Drivetrain

Derived by Bikelake

Front chainrings: 2
Smallest chainring: 26
Largest chainring: 39
Rear sprockets: 10
Smallest sprocket: 11
Largest sprocket: 36
Lowest gear: 19.9 in
Highest gear: 97.5 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Fork spring: Air
Tire width: 2.1″
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.

Front travel

100 mm

This value is within the central range for this class.

Cohort: Mountain / Cross-country Model year: 2015
Sample: 365 bicycles with this information
Coverage: 82.5% of the class

Lowest gear

19.9 gear inches

This value is within the central range for this class.

Cohort: Mountain / Cross-country Model year: 2015
Sample: 410 bicycles with this information
Coverage: 92.7% of the class

Highest gear

97.5 gear inches

This value is within the central range for this class.

Cohort: Mountain / Cross-country Model year: 2015
Sample: 410 bicycles with this information
Coverage: 92.7% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 7.6 km/h
Highest gear: 37.3 km/h

Total gear range 491%

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: 19.9–97.5 gear inches
Class reference (p10–p90): 16.8–110.7 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Cross-country Model year: 2015
Lowest gear: 410 bicycles with this information, 92.7% of the class
Highest gear: 410 bicycles with this information, 92.7% 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 2015 builds

Differences across 2015 builds
Specification	This bicycle K2 Brass Monkey 4 - 27.5	K2 Brass Monkey 1 - 27.5	K2 Brass Monkey 1 - 29	K2 Brass Monkey 2 - 27.5	K2 Brass Monkey 2 - 29	K2 Brass Monkey 3 - 27.5
Drivetrain
Front chainrings	2	3	3	3	3	3
Smallest chainring	26	22	22	22	22	22
Largest chainring	39	42	42	44	44	44
Rear sprockets	10	Not informed	Not informed	9	9	10
Largest sprocket	36	32	32	36	36	36
Lowest gear	19.9 in	18.9 in	19.9 in	16.8 in	17.7 in	16.8 in
Highest gear	97.5 in	105.0 in	110.7 in	110.0 in	116.0 in	110.0 in
Other specifications
Fork spring	Air	Coil	Coil	Not informed	Not informed	Air
Wheel size	27.5″	27.5″	29″	27.5″	29″	27.5″
Wheel material	Not informed	Aluminum	Aluminum	Not informed	Not informed	Not informed