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2025 Naloo

Mountain Jack 20"

A 20″ aluminum frame mountain youth bike with high-end components and hayes dominion a4 hydraulic disc brakes.
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Manufacturer Price

€2,399($2,791)
Weight23.1 lbs  
FrameAluminum
SuspensionFull, 100 / 100mm
ForkManitou Machete JUNIT
ShockRockShox Deluxe Select
Wheels20″ Aluminum
Drivetrain1 × 10
GroupsetGX
BrakesHayes Dominion A4 Hydraulic Disc
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Insights
Ride Feel

Based on frame geometry and build specs.

Handling
nimblestable
Mountain Jack 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

Mountain Jack 20"

Highest gear

(descending)

Spec Level

Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more.

Price History
Geometry
Specs
Build
Frame

Four-bar linkage with Horst Link, optimized kinematics for children, custom butted 6061-T6 aluminum, 100mm travel, 12mm thru-axle, tapered headset

Hanger StandardUDH

Fork

Manitou Junit Machete 20” air suspension fork «Kids Tune», 100mm, ABS compression/rebound, 15mm thru axle

Travel100mm

Spring TypeAir

Shock

RockShox Trunnion Deluxe Select R air shock “Kids Tune” for optimal response at a light weight

Travel100mm

Stem

3D forged 6061T6 aluminum, 31.8mm clamping diameter, 40mm length, +7° angle

Handlebar

Ergonomic handlebar with 12° backsweep, lightweight 7050 double-butted aluminum, 31.8mm clamp, 12.5mm rise, 580mm width

Saddle

Age-appropriate ergonomics, robust upper material, free from plasticizers and harmful substances

Seatpost

Aluminum seatpost, diameter 31.6mm, length 200mm

TypeRigid

Pedals

without

Grips

Verdrehsichere Schraubgriffe mit extra kleinem Durchmesser (25mm)

Groupset
Rear Derailleur

SRAM GX Short Gage, 10-fach

Crank

Leichte Aluminium Kurbel mit Hohlachse und extra schmalem Q-Faktor 149mm, 105mm Länge, 28T Direct Mount Narrow Wide Kettenblatt

Shifters

SRAM GX Trigger, 10-fach

Cassette

Shimano HG-50 11-36, 10-speed

Brakes

Hayes Dominion A4 (front 160mm/rear 160mm)

TypeHayes Dominion A4 Hydraulic Disc

Wheels
Rims

SunRingle DUROC30, 20 holes, tubeless ready

Front Hub

Aluminum hubs with sealed industrial bearings

Rear Hub

Aluminum hubs with sealed industrial bearings

Tires

Schwalbe Rocket Ron, 20x2.25, LiteSkin, Tubeless Easy, folding tire

Rider Notes
Riders Also Viewed

First added October 25

Last updated May 30