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20 X1


20″ knobby tires for off-road riding. Front Atlas air suspension. 8×1 geartrain with trigger shift. Mechanical disc brakes. Lightweight aluminum hydrformed frame with internal routing. 3-piece crank. Wide, stable handlebars. Quick release seat post. The 20 X1 opens up new possibilities for your kid to crush more single-track, dirt park, or whatever else gets thrown at it.

SKU: PK025 Categories: , , ,
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20 X1 Kids Bike

Tackle new terrain and explore new trails with the larger 20″ tires and simple gearing. This is the perfect next bike for your kid ready to move up from a 16″ bike, but looking to take their riding to the trails.

Forth 20 X1 Pedal Bike - True Blue - ISO ViewAll-new hydroformed aluminum frame with internal cable routing.
Forth 20 X1 Pedal Bike - True Blue - front forkAdd some squish with the Atlas Air Fork, featuring lockout and rebound adjustment.
Forth 20 X1 Pedal Bike - True Blue - controlsWide, stable controls with easy squeeze brake levers make the 20 X1 a comfortable ride for your kid.
Forth 20 X1 Pedal Bike - True Blue - drivetrainShimano drivetrain with trigger shift controls.


AHF-6061 Heat Treated, Hydroformed Aluminum


Atlas Air Fork

Fork Adjustment

Rebound, Compression, Lockout

Handlebar Diameter

31.8 mm, 22.2 mm (at grips)

Handlebar Width

600 mm

Handlebar Rise

20 mm

Handlebar Sweep

9 degrees


115 mm, lock-on

Stem Type

Zoom – Alloy

Stem Diameter

31.8 mm

Stem Dimensions

L:35 mm H:36 mm

Seatpost Diameter

27.2 mm

Seatpost Length

250 mm




Platform, Alloy, 108 x 95mm, 9/16" thread


Tektro MD-M280 Mechanical Disc

Brake Rotor Size

F:160 mm R:160 mm

Brake Levers

Tektro – JL510-TS


Shimano SL-M315-8R – 8 speed


Shimano Altus RD-M310- 8 speed


Sunrace – 11-34T


KMC – Z6


Prowheel Alloy – 30T

Crank Arm Length

127 mm

Bottom Bracket

Neco – B910


20” x 1.75, Alloy


Jackl – Alloy, Sealed Bearings, Quick Release


Bend Sender – 20" x 2.3

Weight (w/o pedals)

10.9 kg (24.0 lbs)

Min. Seat Height


Fork Travel

80 mm

Forth Bike Geometry

WB – Wheelbase: 857 mm
FC – Front Center: 519 mm
RC – Rear Center: 340 mm
TTL – Top Tube Length (effective): 449 mm
Reach: 319 mm
Stack: 424 mm
HTA – Head Tube Angle: 69.0 °
HTL – Head Tube Length: 100 mm
FL – Fork Length: 335 mm
STA – Seat Tube Angle: 73.0 °
STL – Seat Tube Length: 275 mm
BB – Bottom Bracket Rise (Drop): (30 mm)

Kids Bike Sizing Chart

Sizing a bike for your child is tricky. Kids grow fast! Getting them on a properly sized bike will help grow confidence and set them up for years of success riding bikes. Happy kids will result in happy parents! We’ve put together a “rough” size chart to help you get started. We’re not guaranteeing this will be 100% accurate, but based on our experience, this at least provides a place to start:

Forth Bike Size Chart
*There are many factors affecting sizing. This is a only guide, but may not be accurate for every kid.

For further sizing tips/advice, check out our page on choosing the right bike for your child.


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