Kids sizing
Kids Bike Size Chart by Age
Use this kids bike size chart by age as a first pass, then confirm height, inseam, lowest saddle height, and brake reach. Age helps pick a wheel-size shortlist, but body measurements decide the final fit.
Data reviewed: 2026-05-17
Model geometry is a reference check; sizing comes from the available size chart rows.
Enter your measurements to see your recommended size, backup size, confidence, and why it fits.
Kids bike size calculator
Calculate wheel size from height, age, inseam, and confidence.
Kids bike size chart
Compare wheel-size ranges with broader kids sizing notes.
Beginners bike size guide
Use first-bike checks for control, braking, and confidence.
Bike size chart by height
Compare youth-adult overlap when the child is near adult sizes.
Sizing notes
Read the chart, then check the bike.
Age is only the first filter
A kids bike size chart by age works for quick shopping, but children grow at different rates. Use age to choose a likely wheel size, then check height and inseam.
Confirm lowest saddle height
The printed wheel size does not guarantee fit. The child should be able to start and stop confidently with the saddle at a safe height.
Check brake reach and confidence
Brake levers, handlebar width, and bike weight can make the right wheel size feel too large. Choose control over extra growth room.
Child bike size chart by age
Size
12 inch wheel
Height
Age 2-4 / 90-105 cm
Inseam: 35-42 cm inseam
Size
14 inch wheel
Height
Age 3-5 / 95-110 cm
Inseam: 38-46 cm inseam
Size
16 inch wheel
Height
Age 4-6 / 100-115 cm
Inseam: 42-52 cm inseam
Size
20 inch wheel
Height
Age 6-8 / 115-135 cm
Inseam: 50-60 cm inseam
Size
24 inch wheel
Height
Age 8-11 / 130-150 cm
Inseam: 58-68 cm inseam
Size
26 inch wheel
Height
Age 10-12+ / 145-160 cm
Inseam: 66-74 cm inseam
FAQ
Short answers for choosing a size before purchase.
How do I use a kids bike size chart by age?
Use age to shortlist a wheel size, then confirm the child's height, inseam, lowest saddle height, brake reach, and confidence before buying.
What size bike does a 5 year old need?
Many 5 year olds start around a 14 or 16 inch wheel, but height and inseam decide whether the smaller or larger wheel is safer.
What size bike does an 8 year old need?
Many 8 year olds start around a 20 or 24 inch wheel. Use height, inseam, and brake reach to choose between them.
Is child bike size based on age or height?
Use both. Age gives a rough wheel-size range, while height and inseam confirm whether the bike can be started, stopped, and controlled safely.