What size bike for my child by age?

Use height, not age: 12 in for around 2 to 3 years, 14 in for 3 to 4, 16 in for 4 to 6, 20 in for 5 to 8, 24 in for 7 to 11, and 26 in for 10+.

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Kids bike size

What size kids bike for 115 to 135 cm tall (about age 5 to 8)?

Recommended size

20 in wheels

If your the child height is 115 to 135 cm tall (about age 5 to 8), go with a 20 in wheels. Kids bikes are sized by wheel diameter, matched to the child height and inseam — not by age alone, since kids of the same age vary a lot.

Size finder — enter the child height (cm)

Enter the child height to see your recommended size.

Full kids bike size chart

The child height	Recommended size
85 to 100 cm tall (about age 2 to 3)	12 in wheels (or balance bike)
95 to 110 cm tall (about age 3 to 4)	14 in wheels
105 to 120 cm tall (about age 4 to 6)	16 in wheels
115 to 135 cm tall (about age 5 to 8)	20 in wheels
130 to 150 cm tall (about age 7 to 11)	24 in wheels
145 to 162 cm tall (about age 10 to 13)	26 in wheels or small adult frame
under 85 cm tall (toddler)	Balance bike (no pedals)

How to measure

Measure the child barefoot against a wall.
Measure inseam — it should let them touch the ground when learning.
Do not buy oversized to last; a too-big bike is unsafe and hard to control.

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What changes your size

Still learning to balance	Pick the smaller wheel size so feet reach the ground.
Confident rider	Size up to the larger wheel for more room to grow.

FAQ

What size kids bike for 115 to 135 cm tall (about age 5 to 8)?: For the child height of 115 to 135 cm tall (about age 5 to 8), the recommended kids bike size is 20 in wheels.
What size bike for my child by age?: Use height, not age: 12 in for around 2 to 3 years, 14 in for 3 to 4, 16 in for 4 to 6, 20 in for 5 to 8, 24 in for 7 to 11, and 26 in for 10+.