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Kids Bike Sizing Guide

Welcome to the kids bike sizing guide for urban bikes, which is what might be considered a “normal” kids bike. Here at the Co-op we love British kids bike brand Frog, but we carefully select the best models from other brands too.

All Kids Bikes

Approx. AgeWheel Size
2 – 4 years Balance Bike
3 – 5 years 12"
4 – 7 years 16"
5 – 10 years 20"
8 – 14 years 24"
11+ 13" – 14" adult

Frog Bike Sizing Guide

Approx. AgeMin. Inside LegWheel SizeFrame SizeBike
2 - 3 34cm 12" 4" Tadpole
3 - 4 43cm 14" 9" Frog 43
4 - 5 48cm 16" 9.5" Frog 48
5 - 6 52cm 20" 10" Frog 52
6 - 7 55cm 20" 11" Frog 55
8 - 10 62cm 24" 12" Frog 62
10 - 12 69cm 26" 14" Frog 69
12 - 14 73cm 26" 16" Frog 73

To get the perfect fit for a Frog bike, you should: Stand the child against a wall, wearing socks, and place a book vertically between their legs as high as comfortable. Then get them to move away from the wall and measure from the top edge of the book to the floor.

Look up the result in the minimum inside leg column of the sizing chart. If your child’s inside leg is 50cm, for example, the appropriate bike for them would be a Frog 48. If your child’s inside leg is 46cm, on the other hand, a Frog 48 will be too big. You should therefore opt for the smaller Frog 43.

And if in doubt, don’t hesitate to contact one of our friendly team who have helped thousands of people just like you.

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