Height, inseam, saddle height
Kids Bike Size Chart by Height
Use height to shortlist a kids wheel size when age is too rough. Then check inseam, lowest saddle height, brake reach, and confidence before buying.
Last reviewed: 2026-08-31
Child bike size chart by height
Wheel size
12 inch wheel
Child height
90-105 cm / 2'11"-3'5"
Age / fit check: 2-4 years · 35-42 cm inseam
Wheel size
14 inch wheel
Child height
95-110 cm / 3'1"-3'7"
Age / fit check: 3-5 years · 38-46 cm inseam
Wheel size
16 inch wheel
Child height
100-115 cm / 3'3"-3'9"
Age / fit check: 4-6 years · 42-52 cm inseam
Wheel size
18 inch wheel
Child height
107-130 cm / 3'6"-4'3"
Age / fit check: 5-7 years · check lowest saddle
Wheel size
20 inch wheel
Child height
115-135 cm / 3'9"-4'5"
Age / fit check: 6-9 years · 50-60 cm inseam
Wheel size
24 inch wheel
Child height
130-150 cm / 4'3"-4'11"
Age / fit check: 8-12 years · 58-68 cm inseam
Wheel size
26 inch wheel
Child height
145-160 cm / 4'9"-5'3"
Age / fit check: 11+ years · 66-74 cm inseam
Sizing notes
Read the chart, then check the bike.
Height gives the wheel-size shortlist
For kids bikes, height usually points to a likely wheel size before frame geometry matters. Use it to narrow the choice, then check the real bike's saddle range.
Inseam confirms starts and stops
A child needs enough inseam to start, stop, and put a foot down confidently. If standover or lowest saddle height is close, compare the smaller wheel size.
Brake reach and confidence matter
The right wheel size can still be wrong if the child cannot reach the brakes or steer the bike comfortably. Choose control over extra growth room.
Age is a secondary check
Age helps when height ranges overlap, but growth rates vary. Use the age chart only after height and inseam create the shortlist.
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 the rider is near mountain or hybrid sizes.
FAQ
Quick answers to common bike-sizing questions.
How do I use a kids bike size chart by height?
Match the child's height to a wheel-size range first, then confirm inseam, lowest saddle height, brake reach, and confidence before buying.
What size kids bike by height does my child need?
Most children move from 12 to 16 inch wheels under about 115 cm, 20 inch around 115-135 cm, 24 inch around 130-150 cm, and 26 inch near youth-adult overlap.
What size bike is right for a child by height?
Use height to shortlist the wheel size, then compare the real bike's lowest saddle height, inseam clearance, brake reach, and control. Adjacent ranges can overlap.
Is a child bike size chart by height better than age?
Height is usually more accurate than age, but inseam and bike control still decide the final size.
Should I size up for growth room?
Only if the child can still start, stop, steer, and brake safely. A too-large bike slows learning and reduces control.