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Measure their head.
- 1Use a soft tape measure or a piece of string and ruler.
- 2Wrap around the widest part of the head, just above the eyebrows.
- 3Keep the tape level and snug, but not tight.
- 4Use the cm measurement to choose a size in the helmet selector.
How the free helmet works
A free helmet with every YOMO bike. Here is exactly how to claim yours — it takes about a minute.
Watch YOMO in action
See confidence inmotion
A closer look at how YOMO helps children ride with more confidence.
- Lightweight control
- Child-specific geometry
- Confidence from first ride
Everything you need to know
First gears. Bigger adventures. Confidence stays in control.
Why YOMO 20 rides better
Proof-led details that help children ride with less effort, easier control and more confidence from the first push.
Looks can create the first smile. The right fit brings them back tomorrow.
Light weight, child-specific fit and easy control help confidence grow into more rides and a lasting love of cycling.
Lightweight build
At 7.65 kg, YOMO 20 keeps the ride manageable so your child can focus on confidence, not fighting the bike.
Child-specific geometry
YOMO geometry is built around a child’s proportions, helping riders sit naturally, steer predictably and feel in control.
Scaled for children
From grips and levers to cockpit sizing, the details are chosen so the bike feels natural rather than oversized.
Narrow Q-factor
The child-specific crank setup supports smoother pedalling and avoids the wide, awkward stance common on many children’s bikes.
Easy gear changes
Rapidfire-style shifting helps children learn gears confidently, with useful ratios that make hills and family rides easier.
Quick-release setup
Quick-release hardware simplifies final setup and future maintenance, especially on larger models shipped with the front wheel removed.
Sealed bearing hubs
Sealed bearing hubs help the wheels roll smoothly and keep maintenance low, with child-friendly hardware details.
Child-specific saddle
The saddle is chosen for children’s proportions so longer rides stay comfortable and confidence lasts beyond the first few minutes.
Rust-resistant details
Stainless spokes and rust-conscious hardware help the bike stay smarter for longer, especially through British weather.
A bike that feels light, natural and easy to control gives confidence room to grow.
YOMO bike
90% assembled with front wheel removed for shipping
Front wheel
Ready to fit with the included guide
Pedals
Clearly marked left and right
YOMO all-in-one toolkit
Tools for final setup
Easy assembly manual
Step-by-step visual guidance
Bike manual, bell and reflectors
Care, safety and warranty essentials
Frame set
Frame
6061 T6 Heat-Treated, Triple Butted Lightweight Alloy. Features Low Centre of Gravity, Child-Specific Geometry, and Internal Cable Routing. Seat Tube Length: 10’’
Fork
6061 T6 Heat Treated, Lightweight Alloy, 1-1/8’’ Alloy Steerer
Headset
1-1/8" Semi-Integrated Threadless Headset
Seat Clamp
Quick-Release Mechanism, 31.8mm Diameter
Cockpit & contact points
Handlebars
Alloy Butted 500mm Flat Handlebar: 6-Degree Backsweep, 25.4mm Bar Bore
Stem
Lightweight Alloy, 28.6mm Steerer, 10-Degree Rise, 50mm Extension, 25.4mm Bar Bore
Grips
Velo Double Density Grips: Slim Profile, Comfortable and Non-Slip Surface, Ergonomic Design, 116.2mm Length
Saddle
Selle Royal Explora JRN Saddle: Kid-Friendly Ergonomics, Water-Resistant Vacuum Technology, Dimensions: L: 225mm x W: 135mm
Seatpost
3D Forged Alloy, Micro Adjust Mechanism, 27.2mm Dia, 250mm Length, 12mm Offset, with Scale Line
Braking System
Brake Levers
Tektro JL510-RS, Aluminium, Reach Adjustable Mechanism, Tailored for Young Riders’ Hands.
Front Brake
Alloy Mini V-Brake, Dual Linear Spring Tension Adjuster, Rust free Nut & Bolts
Rear Brake
Alloy Mini V-Brake, Dual Linear Spring Tension Adjuster, Rust free Nut & Bolts
Drivetrain
Shift Levers
Shimano 7-Speed Rapidfire Plus: Enables Quick Shifting with the Capability to Downshift Three Gears in One Stroke. Features Optical Gear Display.
Freewheel/Cassette
Shimano 7-Speed Cassette, Gear combination: 11-28T, Features HYPERGLIDE Technology
Chain
KMC Z7, High Pin Power, Reinforced Durability, and Quieter Riding Experience. Rust-free.
Crankset
Forged Alloy 3-Piece Crankset: Narrow Q-Factor, Square Taper, 114mm Length, Double Plastic Chainguard, with Anodized Green Allen Key Bolt
Chainrings
Forged Alloy, 32T
Bottom Bracket
Thun Goal, Square Taper, 68mm/110.5mm, Cartridge Bearings
Rear Derailleur
Shimano 7-Speed RD-FT35-A-SS: Low Profile Design with Enhanced Ground Clearance to Prevent Obstacle Contact
Wheelset
Rims
YOMO Lightweight Alloy Rim: Double-Wall, 20H, CNC Sidewall for Enhanced Braking, with Integrated Rim Wear Line.
Front Hub
Lightweight Alloy, Sealed Bearing, 20H, Equipped with Quick Release Axles
Rear Hub
Lightweight Alloy, Sealed Bearing, 20H, 7 Speed Freehub Body Equipped with Quick Release Axles
Spokes
Stainless Steel, 14G
Tyres
Kenda Small Block Eight, 20’’ x 1.50, Reflective Sidewall for Enhanced Low-Light Visibility
Inner tubes
Schrader (American valve), Lightweight Tubes
Accessories
Pedals
Resin Platform, 9/16" Thread, W/Reflectors
Reflectors
Front: Handlebar Mounted, Rear: Saddle Rail Mounted Reflectors
What size child does this model suit?+
YOMO 20 is designed for riders aged approximately 6–9 years, with an inside leg of 53–67 cm and rider height of 115–135 cm. Age starts the search; inside leg confirms the fit.
How much assembly is needed?+
YOMO 20 arrives 90% assembled with the front wheel removed for shipping. Fit and secure the front wheel, align the handlebar, install the pedals, complete every safety check and follow the included setup guide before riding.
How do I set the saddle height?+
For a newer rider, start low enough to place the balls of both feet securely on the ground while seated. As confidence grows, raise the saddle so the leg keeps a slight bend at the bottom of the pedal stroke, without exceeding the seatpost limit mark.
How should a rider learn to use gears?+
Start on flat ground. Lower gears make pedalling easier; higher gears suit faster riding. Shift before a hill and ease pressure on the pedals while changing gear.
How do I adjust the brake lever position?+
Loosen the lever clamp bolt slightly, rotate the lever to a comfortable angle for the rider hand, retighten it securely and confirm both brakes engage fully before riding.
What if a brake rubs?+
Check that the wheel is seated correctly and the brake pads sit evenly beside the rim. Use the brake-arm spring-tension screws only as shown in the setup guide, then confirm the wheel spins freely and both brakes stop the bike securely.
How often should I service it?+
Check brakes, tyre pressure, gears, chain condition, wheel security and bolt tightness regularly. Arrange a yearly safety check by a qualified bike mechanic for regular riders.
Where is the serial number?+
The serial number is stamped underneath the frame around the bottom-bracket area. Take a clear photo after purchase for registration, warranty and support.
What is the maximum rider weight?+
The maximum total load for this model is 65 kg, including the rider and anything they carry. Staying within it keeps the frame, wheels and components working as designed.
What tyre pressure should I use?+
Use the permitted pressure range printed on the tyre sidewall. For a lighter rider, start in the lower part of that range and adjust for grip and comfort. Never exceed the maximum shown on the tyre.
What happens when my child outgrows it?+
YOMO BikeTrade lets you trade in an eligible YOMO towards the next size. The calculator gives an estimate; final credit is confirmed after inspection and depends on age, condition and the current programme terms.
What is the warranty?+
YOMO bikes include a 3-year frame and fork warranty as standard. Eligible bikes registered within 30 days receive lifetime frame and fork cover for the original purchaser. Other components are covered for 1 year against manufacturing faults. Normal wear, crashes, misuse, poor maintenance, incorrect assembly, modifications, improper repairs and cosmetic marks from use are not covered.
Can I return it if it is not right?+
Unused bikes can be returned within 30 days in their original condition, packaging and with all accessories included. Contact YOMO before returning the bike; collection costs may apply to unwanted returns.
Trusted by parents
Loved from the veryfirst ride.
Read honest feedback from families riding this YOMO. Every review helps another parent choose with confidence.
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