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Kids' bike sizes are given by wheel size, in inches. What matters most is your child's height rather than their age. Use this table as a guide:
| Wheel | Child's height | Approximate age |
|---|---|---|
| 12 inch | 86 to 102 cm | 2 to 4 years |
| 16 inch | 99 to 117 cm | 4 to 6 years |
| 20 inch | 114 to 132 cm | 5 to 8 years |
| 24 inch | 127 to 147 cm | 8 to 11 years |
| 26 inch | From about 140 cm | 10 to 13 years |
If your child is between two sizes, look at how they sit on the bike rather than at the table.
How to check the size is right
- Sitting on the saddle, they should reach the ground with the tips of both feet. For a first bike without stabilisers, it is better if they can put their feet almost flat: they will feel more confident.
- Standing astride the bike, there should be some clearance between their crotch and the frame.
- Their hands should reach the handlebar and brake levers without fully straightening their arms.
Don't buy it big "so it lasts"
A bike that is too big is harder to control and to brake, and children lose confidence. The right size is better: the saddle can be raised several centimetres as they grow, and when they outgrow it, it is easy to sell or hand down.
When to move up a size
When, with the saddle at its highest, their knees are very bent when pedalling or hit the handlebar when turning, it is time to change. From around 145-150 cm tall, many children can already ride an adult XS bike.
Come and try one
At our shop in La Unión, near Cartagena, your child can try the bike and we will set it up before you take it home. Browse all our kids' bikes or message us on WhatsApp with your child's height and we will tell you which size fits.
Want to know more? Read our full buying guide: an in-depth look at each version, what it is best for, and advice from our workshop.