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2021 Rocky Mountain

Growler Jr 20

A 20″ aluminum frame mountain youth bike with modest components and shimano hydraulic disc brakes.
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Manufacturer Price

$729
FrameAluminum
SuspensionHardtail, 60mm
ForkSuntour XCT
Wheels20″ Aluminum
Drivetrain1 × 8
GroupsetAltus
BrakesShimano Hydraulic Disc
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Insights
Ride Feel

Based on frame geometry and build specs.

Handling
nimblestable
Growler Jr 20
Other Mountain Youth bikes
Gearing

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

Lowest gear

(climbing)

15 mph

Growler Jr 20

Highest gear

(descending)

Reviews
99 Spokes
2020 Rocky Mountain Growler Jr 24

Jun 2020

The Growler Jr 24 is a scaled down version of the popular hardtail from Rocky Mountain Bikes. Like its big brother, it’s a progressive hardtail shredding machine.

Highs
  • Progressive geometry and plenty of kid friendly features

Lows
  • A bit on the heavy side

Read Review

Mountain Bike Action
Mountain Bike Action Bike Test: Rocky Mountain Growler 50 Trail Bike

Oct 2020 · McCoy

Enduro geometry on a hardtail?

Read Review

Outdoor Gear Lab
Rocky Mountain Growler 50

Mar 2020 · Pat Donahue

The redesigned Rocky Mountain Growler 50 is a hard-charging hardtail with the attitude of an enduro bike. This aggressive bicycle lives for high speeds and...

Highs
  • Aggressive geometry

  • Built to last

  • Killer tires

Lows
  • May be overkill for riders/trails

  • Sluggish in tight spaces

Read Review

NSMB
2020 Rocky Mountain Growler 20

Dec 2019

Rocky brings modern hardtail geometry at an entry-level price with the 1000 USD Growler 20...

Highs
  • Excellent frame geometry with 64° head angle

  • Shared frame across all Growler models (future-proof and upgrade-friendly)

  • Great 29x2.6" WTB Trail Boss tires

  • Good Shimano MT201 brakes with modulation

  • Affordable price at $1,000 USD

  • Boost 148 thru-axle rear end, tapered headtube, BSA bottom bracket

Lows
  • Awful hard plastic grips

  • Clutchless derailleur causes noise and chain drop

  • Basic Suntour fork with overdamped feel and blow-off issues

  • Short seatpost for sizing down with steep STA

  • Resin-only rotors and Centerlock hubs (less upgrade-friendly)

  • Square taper crankset flex

  • Altus drivetrain doesn't shift well under load

Read Review

BIKE Magazine
Tested: Rocky Mountain Growler 50 | $1,900

Nov 2019

Modern geometry meets affordable hardtail in the Rocky Mountain Growler 50.

Read Review

Geometry
Specs
Build
Frame

Rocky Mountain 6061 Alloy. Threaded BB. Zerostack Headtube. Dropper Post Compatible.

BB StandardBSA, Threaded

Fork

Suntour XCT JR 63mm

Travel60mm

Spring TypeCoil

Bottom Bracket

Sealed Cartridge Bearing

Headset

FSA No. 10P | 5/32" X 20 Retainer Bearings

Stem

Rocky Mountain XC | 7° Rise | All Sizes = 40mm

Handlebar

Rocky Mountain XC | 600mm Width | 25mm Rise | 9° Backsweep | 5° Upsweep | 31.8mm Clamp

Saddle

Rocky Mountain Pivotal Kids

Seatpost

Rocky Mountain Pivotal 30.9mm

TypeRigid

Pedals

Nylon Platform

Grips

Rocky Mountain Slide On Kids

Groupset
Rear Derailleur

Shimano Altus

Crank

Rocky Mountain Microdrive 28T

Shifters

SunRace DLM403 Trigger

Cassette

SunRace CSM55 11-34T

Chain

KMC Z8.3

Brakes

Shimano MT200 2 Piston | Organic Pads | Shimano RT10 160mm F Rotor | Shimano RT10 160mm R Rotor

TypeShimano Hydraulic Disc

Wheels
Rims

Rocky Mountain JR30 Tubeless | Tubeless Compatible - Tape | Valves | Sealant Not Incl

Spokes

2.0 Stainless

Front Hub

Shimano TX505

Rear Hub

Shimano TX505 QR

Tires

F: Kenda Slant Six 20 x 2.6 // R: Kenda Amrak 20 x 2.4

Rider Notes
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First added August 11

Last updated January 12

Not listed for 1,977 days