Child, youth, teen
Bike Size Chart by Age
Use age as a first-pass wheel-size shortlist for children. Height, inseam, standover, reach, and confidence decide the final fit.
Last reviewed: 2026-08-31
Bicycle size chart by age
Wheel size
12 inch wheel
Typical age
2-3 years
Child height range: 2'10"-3'4" / 85-100 cm
Wheel size
14 inch wheel
Typical age
3-4 years
Child height range: 3'1"-3'7" / 95-110 cm
Wheel size
16 inch wheel
Typical age
4-6 years
Child height range: 3'7"-4'0" / 105-120 cm
Wheel size
18 inch wheel
Typical age
5-7 years
Child height range: 3'6"-4'3" / 107-130 cm
Wheel size
20 inch wheel
Typical age
6-9 years
Child height range: 4'0"-4'5" / 115-135 cm
Wheel size
24 inch wheel
Typical age
8-12 years
Child height range: 4'3"-4'11" / 127-150 cm
Wheel size
26 inch wheel
Typical age
11+ years
Child height range: 4'9"+ / 145 cm+
Sizing notes
Read the chart, then check the bike.
Age is a starting filter
A bike size chart by age is useful for a quick shortlist, especially for kids bikes. It should not replace height, inseam, lowest saddle height, brake reach, and handling checks.
Child bike size chart by age uses wheel size
For younger riders, age usually maps to wheel diameter rather than frame size. A 16, 20, or 24 inch bike describes the wheel, not the child's exact fit.
Height breaks ties
When age ranges overlap, use the child's height first, then inseam and lowest saddle height. Children of the same age can need different wheel sizes.
Teen bike size chart ranges overlap
Older kids and teens may fit 24 inch, 26 inch, youth XS, adult XS, or adult S bikes. Compare control and reach before choosing growth room.
Adults should use frame charts
For adult riders, age rarely decides bike size. Use adult road, gravel, mountain, hybrid, or frame-size charts based on height, inseam, and bike type.
Related guides
Choose the right chart for your bike
Once you have a starting size, compare the chart for your bike type or exact model.
Bike size chart by height in inches
Switch to adult frame sizing when age no longer describes the rider's fit.
FAQ
Quick answers to common bike-sizing questions.
How do I use a bike size chart by age?
Use age to shortlist a child, youth, or teen wheel size, then confirm height, inseam, standover, reach, and control. Adult riders should use a frame-size chart.
Is a bicycle size chart by age accurate?
It is a useful first pass for children, but it is less accurate than height and inseam. For adults, bike type and frame geometry matter more than age.
What age is a 24 inch bike for?
A 24 inch bike often fits older children around 8 to 11 years old, but height, inseam, saddle height, and confidence decide whether it is safe.
What age is a 20 inch bike for?
A 20 inch bike often fits children around 6 to 9 years old, but compare height, inseam, lowest saddle height, and brake reach because age ranges overlap.
What age should use a teen bike size chart?
Use a teen bike size chart when a rider is moving from 24 inch or 26 inch bikes toward adult XS or S frames.