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Kids Bike Size Guide: Choose the Right Wheel Size |
| Talla Guía Gravel Niños Eléctrica Cuentakilómetros |
Kids bikes — safety and confidence first
Unlike adult bikes which are sized by frame length, children's bikes are sized by wheel diameter. The golden rule for kids: both feet must rest flat on the ground while seated. This allows them to stop safely and builds confidence. An oversized bike is the #1 cause of children giving up on cycling.
Kids bike size chart by age and height
| Age (approx.) | Height (cm) | Inseam (cm) | Wheel size |
|---|---|---|---|
| 2 - 4 years | 85 - 100 cm | 30 - 40 cm | 12" (balance / pedals) |
| 3 - 5 years | 95 - 110 cm | 35 - 45 cm | 14" |
| 4 - 7 years | 105 - 120 cm | 40 - 50 cm | 16" |
| 6 - 9 years | 115 - 130 cm | 45 - 55 cm | 18" |
| 7 - 10 years | 120 - 140 cm | 50 - 60 cm | 20" |
| 9 - 13 years | 135 - 155 cm | 58 - 68 cm | 24" |
| 12+ years | 150+ cm | 65+ cm | 26" or adult XS |
How to test if the bike fits your child
- Standover test: with the child standing over the bike (feet on the ground), there should be 2-5 cm of clearance between the top tube and the child's crotch.
- Seated test: both feet should touch the ground flat. For young children just learning, this is essential for safety.
- Handlebar reach: the child should grip the bars comfortably without over-stretching. Arms should be slightly bent, not locked.
- Brake reach: check that small hands can comfortably reach and operate the brake levers.
Balance bikes vs training wheels
Balance bikes (no pedals) are recommended for ages 2-4. Children learn balance first, then pedalling. Kids who start on balance bikes typically learn to ride pedal bikes faster and with more confidence than those using training wheels.
Training wheels create a false sense of security — the child doesn't learn to balance. If you choose training wheels, transition to two wheels as soon as the child shows basic steering control.
Check your child's measurements
Enter the inseam in the calculator for a personalised estimate.
Go to calculator →For children learning to ride, reduce the calculated saddle height so both feet rest fully flat on the ground.