Kids sizing
Kids Bike Size Chart
Kids bikes are sized mostly by wheel diameter, but inseam still matters because a child needs safe starts, stops, and confident standover.
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.
Sizing notes
Read the chart, then check the bike.
Do not oversize too much
A bike with too much growth room is harder to start, stop, and turn. Confidence matters more than keeping the bike for an extra season.
Check brake reach
Children need to reach the brake levers easily from a normal grip. This can rule out an otherwise correct wheel size.
Use the lowest saddle height
Wheel size is only a label. The real fit test is whether the saddle can go low enough for safe starts and stops.
Kids bike wheel size chart
Size
12"
Height
83-102 cm
Inseam: 31-41 cm
Size
16"
Height
97-119 cm
Inseam: 39-49 cm
Size
20"
Height
113-136 cm
Inseam: 48-59 cm
Size
24"
Height
125-151 cm
Inseam: 54-67 cm
FAQ
Short answers for choosing a size before purchase.
What size bike does my child need?
Start with height and wheel size, then check inseam, saddle height, and brake reach.
Should I buy a kids bike with growth room?
Yes, but not so much that starting, stopping, or steering becomes difficult.