Rocky Mountain Growler 40

Name: Rocky Mountain Growler 40
Brand: Rocky Mountain

2021 MountainTrail

Last known price: $1,669

Prices shown first for United States
Fork travel: 140 mm
Wheels: 29″
Drivetrain: 1 × 12 30t / 10–51t
Gear range: 510%
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

18 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

Rocky Mountain 6061 Alloy. Threaded BB. Boost 148mm. Tapered Zerostack Headtube. Dropper Post Compatible. Not identified

Suspension

1 part

Fork
- SR Suntour

Drivetrain

6 parts

Bottom bracket
- Shimano SM-BB52
SM-BB52
Cassette
- Shimano Deore CS-M6100-12 12 speeds 10–51t
CS-M6100-12
Chain
- Shimano Deore CN-M6100
CN-M6100
Crankset
- Shimano Deore 30t
Rear derailleur
- Shimano Deore RD-M6100 12 speeds
RD-M6100
Shifters
- Shimano Deore SL-M6100 12 speeds
SL-M6100

Brakes

1 part

Brakes
- Shimano

Wheels and tires

5 parts

Front hub
- Shimano HB-MT410
HB-MT410
Rear hub
- Shimano FH-MT410
FH-MT410
Rims
- WTB
Spokes

2.0 Stainless Not identified
Tires
- WTB

Cockpit and contact points

7 parts

Sizes and geometry

4 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 450mm

Stack 634mm

Wheelbase 1210mm

Head angle 64.0°

Seat angle 75.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 29″ wheel; exact published values are in the table below.

Size Reported by the manufacturer

Complete manufacturer geometry table 4 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	425	450	475	500
Stackmm	630	634	643	652
Top tube lengthmm	593	620	647	675
Seat tube lengthmm	380	420	445	480
Head tube lengthmm	95	100	110	120
Head tube angle	64°	64°	64°	64°
Seat tube angle	75°	75°	75°	75°
Chainstay lengthmm	435	435	435	435
Wheelbasemm	1183	1210	1239	1269
Front centermm	754	780	809	839
Bottom bracket dropmm	55	55	55	55
Bottom bracket heightmm	319	319	319	319
Standover heightmm	779	802	804	818
Fork rakemm	41	41	41	42
Trailmm	137	137	137	136
Stack/reach ratio	1.48	1.41	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: Aluminum

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: 10
Largest sprocket: 51
Lowest gear: 17.1 in
Highest gear: 87.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Dropper seatpost
Shifting: Mechanical

Additional specifications

Bottom bracket standard: BSA
Fork spring: Air
Tire width: 2.6″
Wheel material: Aluminum
Wheel size: 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: 2021
Sample: 1,324 bicycles with this information
Coverage: 98.1% of the class

Lowest gear

17.1 gear inches

This value is below the central range for this class.

Cohort: Mountain / Trail Model year: 2021
Sample: 1,137 bicycles with this information
Coverage: 84.2% of the class

Highest gear

87.0 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2021
Sample: 1,137 bicycles with this information
Coverage: 84.2% of the class

Shifting

Mechanical

53 of 1,346 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2021
Sample: 1,346 bicycles with this information
Coverage: 99.7% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.5 km/h
Highest gear: 33.3 km/h

Total gear range 510%

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: 17.1–87.0 gear inches
Class reference (p10–p90): 16.9–98.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Trail Model year: 2021
Lowest gear: 1137 bicycles with this information, 84.2% of the class
Highest gear: 1137 bicycles with this information, 84.2% 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 2021 builds
Specification	This bicycle Rocky Mountain Growler 40	Rocky Mountain Growler 20	Rocky Mountain Growler 50	Rocky Mountain Growler 50 SRAM	Rocky Mountain Growler Jr 20	Rocky Mountain Growler Jr 24
Frame
Bicycle weight	Not informed	Not informed	14.5 kg	14.59 kg	Not informed	Not informed
Suspension
Front travel	140 mm	130 mm	150 mm	150 mm	60 mm	80 mm
Drivetrain
Smallest chainring	30	28	30	30	28	28
Largest chainring	30	28	30	30	28	28
Rear sprockets	12	10	12	12	8	8
Smallest sprocket	10	11	11	11	11	11
Largest sprocket	51	46	50	50	34	40
Lowest gear	17.1 in	17.7 in	17.4 in	17.4 in	16.5 in	16.8 in
Highest gear	87.0 in	73.8 in	79.1 in	79.1 in	50.9 in	61.1 in
Cockpit
Seatpost	Dropper seatpost	Rigid seatpost	Dropper seatpost	Dropper seatpost	Rigid seatpost	Rigid seatpost
Other specifications
Fork spring	Air	Coil	Air	Air	Coil	Coil
Wheel size	29″	29″	29″	29″	20″	24″