Rocky Mountain Growler Jr 20

2021 YouthMountain youth

Last known price: $729

Prices shown first for United States
Fork travel: 60 mm
Wheels: 20″
Drivetrain: 1 × 8 28t / 11–34t
Gear range: 309%
Frame: Aluminum
Brakes: Hydraulic disc

Sizes

Size guide

The manufacturer did not publish rider heights for these sizes.

Components

17 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. Zerostack Headtube. Dropper Post Compatible. Not identified

Suspension

1 part

Fork
- SR Suntour

Drivetrain

6 parts

Bottom bracket

Sealed Cartridge Bearing Not identified
Cassette
- SunRace 11–34t
Chain
- KMC Z8.3 8 speeds
Crankset
- Rocky Mountain 28t
Rear derailleur
- Shimano Altus
Shifters
- SunRace

Brakes

1 part

Brakes
- Shimano BR-MT200
BR-MT200

Wheels and tires

5 parts

Front hub
- Shimano HB-TX505
HB-TX505
Rear hub
- Shimano FH-TX505 11 speeds
FH-TX505
Rims
- Rocky Mountain
Spokes

2.0 Stainless Not identified
Tires
- Kenda

Cockpit and contact points

7 parts

Sizes and geometry

1 size Open in the geometry plotter

Complete rider-height ranges are not published for these sizes. You can still explore the geometry below.

Size 20"

Table

Reach 340mm

Stack 424mm

Wheelbase 925mm

Head angle 66.0°

Seat angle 73.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 20″ wheel; exact published values are in the table below.

Size Reach Stack

Complete manufacturer geometry table 1 published size

Complete manufacturer geometry by size
Measurement
Reachmm	340
Stackmm	424
Top tube lengthmm	470
Seat tube lengthmm	255
Head tube lengthmm	90
Head tube angle	66°
Seat tube angle	73°
Chainstay lengthmm	360
Wheelbasemm	925
Front centermm	566
Bottom bracket dropmm	15
Standover heightmm	614
Fork rakemm	39
Stack/reach ratio	1.25

Not published by the manufacturer: Bottom bracket height, Trail, 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: 60 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 28
Largest chainring: 28
Rear sprockets: 8
Smallest sprocket: 11
Largest sprocket: 34
Lowest gear: 16.5 in
Highest gear: 50.9 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: Coil
Tire width: 2.6″
Wheel material: Aluminum
Wheel size: 20″

Technical analysis

2 measures

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

Lowest gear

16.5 gear inches

This value is below the central range for this class.

Cohort: Youth / Mountain youth Model year: 2021
Sample: 230 bicycles with this information
Coverage: 72.3% of the class

Highest gear

50.9 gear inches

This value is below the central range for this class.

Cohort: Youth / Mountain youth Model year: 2021
Sample: 230 bicycles with this information
Coverage: 72.3% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.3 km/h
Highest gear: 19.5 km/h

Total gear range 309%

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: 16.5–50.9 gear inches
Class reference (p10–p90): 15.6–80.0 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Youth / Mountain youth Model year: 2021
Lowest gear: 230 bicycles with this information, 72.3% of the class
Highest gear: 230 bicycles with this information, 72.3% 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

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