Boardman JNR 20"

2025 YouthGeneral youth Manufacturer page

Price: Not published

Prices shown first for United States
United Kingdom: £340 Last known price
Suspension: Rigid
Wheels: 20″
Drivetrain: 1 × 7 32t / 14–28t
Gear range: 200%
Frame: Aluminum
Brakes: Rim brake

Sizes

Size guide

The manufacturer did not publish rider heights for these sizes.

Components

17 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

Lightweight Triple butted, smooth weld aluminium Not identified

Suspension

1 part

Fork

1" Triple Butted, smooth weld aluminium lowers with Chromo Steerer Not identified

Drivetrain

6 parts

Bottom bracket
- FSA
BB-7420ST
Cassette
- Shimano Tourney TZ MF-TZ500
MF-TZ500
Chain
- KMC
Crankset
- Prowheel
Rear derailleur
- Shimano Altus RD-M310
RD-M310
Shifters
- Shimano Altus SL-M315
SL-M315

Brakes

2 parts

Wheels and tires

4 parts

Front hub
- Formula
Rear hub
- Formula
Rims

Double Wall Alloy Not identified
Tires
- Vee Rubber

Cockpit and contact points

6 parts

Sizes and geometry

6 sizes

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: Aluminum

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 32
Largest chainring: 32
Rear sprockets: 7
Smallest sprocket: 14
Largest sprocket: 28
Lowest gear: 22.9 in
Highest gear: 45.7 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Rim brake

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Tire width: 1.5″
Wheel material: Aluminum
Wheel size: 20″

Gearing

Estimated speeds at 80 rpm

Lowest gear: 8.8 km/h
Highest gear: 17.5 km/h

Total gear range 200%

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: 22.9–45.7 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 2025 builds
Specification	This bicycle Boardman JNR 20"	Boardman JNR 12" Balance	Boardman JNR 16"	Boardman JNR 24"	Boardman JNR 26"	Boardman JNR ADV 26"
Drivetrain
Front chainrings	1	Not informed	1	1	1	1
Smallest chainring	32	Not informed	25	32	32	32
Largest chainring	32	Not informed	25	32	32	32
Rear sprockets	7	Not informed	Not informed	9	9	8
Smallest sprocket	14	Not informed	Not informed	11	11	11
Largest sprocket	28	Not informed	Not informed	42	42	34
Lowest gear	22.9 in	Not informed	Not informed	18.3 in	19.8 in	24.5 in
Highest gear	45.7 in	Not informed	Not informed	69.8 in	75.6 in	75.6 in
Brakes
Brake type	Rim brake	Rim brake	Rim brake	Rim brake	Mechanical disc	Mechanical disc
Cockpit
Seatpost	Rigid seatpost	Not informed	Rigid seatpost	Rigid seatpost	Rigid seatpost	Rigid seatpost
Shifting	Mechanical	No shifting	Mechanical	Mechanical	Mechanical	Mechanical
Other specifications
Tire width	1.5″	1.75″	1.5″	1.5″	1.5″	1.5″
Wheel size	20″	12″	16″	24″	26″	26″