Marin Donky JR 20" 1

2026 YouthGeneral youth Manufacturer page

Last known price: $449

Prices shown first for United States
Suspension: Rigid
Wheels: 20″
Drivetrain: 1 × 1 32t / 16t
Gear range: 100%
Frame: Aluminum
Brakes: Rim brake

Sizes

Size guide

The manufacturer did not publish rider heights for these sizes.

Components

2 of 20 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

Series 1 Aluminum, 20” Wheels, Single Speed, Rim Brake Not identified

Suspension

1 part

Fork

Steel Fork, Rim Brake Not identified

Drivetrain

4 parts

Bottom bracket

Sealed Cartridge Bearings, Square Taper Not identified
Cassette

Single Speed Freewheel, 16T Not identified
Chain
- KMC
Crankset

Forged Alloy, 32T, 140mm, Ring Guard Not identified

Brakes

2 parts

Brake levers

Kid's Specific Short Reach Alloy Lever Not identified
Brakes

Linear Pull, Alloy Not identified

Wheels and tires

5 parts

Front hub

Forged Aluminum Alloy, 16H Not identified
Rear hub

Forged Aluminum Alloy, 16H Not identified
Rims

Aluminum, CNC Brake Surface Not identified
Spokes

14g Stainless Steel Not identified
Tires
- Marin

Cockpit and contact points

7 parts

Grips

Single Densitiy Not identified
Handlebar

Riser Bar, 127mm Rise, 580mm Width Not identified
Headset

Threadless Not identified
Pedals

Kids Specific Nylon Pedal Not identified
Saddle

Integrated Saddle/Post Not identified
Seatpost

25.4mm, Integrated Saddle/Post Not identified
Stem

Alloy, 48mm Not identified

Sizes and geometry

1 size

Rider-height ranges are not published for these sizes.

Size

Geometry not published

The manufacturer lists these sizes without frame measurements, so there is no drawing or geometry table.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Aluminum
Fork material: Steel

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 32
Largest chainring: 32
Rear sprockets: 1
Smallest sprocket: 16
Largest sprocket: 16
Lowest gear: 40.0 in
Highest gear: 40.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Rim brake

Fit and controls

Seatpost: Rigid seatpost
Shifting: No shifting

Additional specifications

Tire width: 2″
Wheel material: Aluminum
Wheel size: 20″

Gearing

Estimated speeds at 80 rpm

Lowest gear: 15.3 km/h
Highest gear: 15.3 km/h

Total gear range 100%

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: 40.0–40.0 gear inches

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 2026 builds

Differences across 2026 builds
Specification	This bicycle Marin Donky JR 20" 1	Marin Donky JR 20" 6	Marin Donky JR 24"
Drivetrain
Rear sprockets	1	6	6
Smallest sprocket	16	14	14
Largest sprocket	16	28	28
Lowest gear	40.0 in	22.9 in	27.4 in
Highest gear	40.0 in	45.7 in	54.9 in
Cockpit
Shifting	No shifting	Mechanical	Mechanical
Other specifications
Wheel size	20″	20″	24″