Children's Bike Size

bike frame size

Undoubtedly, cycling is a very beneficial exercise for children. In addition to helping children grow and develop, it can also promote height growth. At the same time, cycling helps children get close to nature, enrich their lives, stimulate their facial features and vision. In the process of riding a bicycle, it can also exercise the child's balance ability, enhance reaction sensitivity, improve the cardiopulmonary function and lower limb muscles, and play a fitness role. Comprehensive exercise can also promote brain development.

When you choose a children's bike, you must choose an appropriate size, and this appropriate size is determined by your height and habits, the most important thing is your child's height and inner leg length(inseam). In the table below you can see your child's height and recommended children's bike bike with correct wheel size.

Children's Bike Size

Rider Height(cm/ft/in) and Age Suggested Wheel Diameter
Age(year) Height in centimeters Height in feet & inches Inside Leg/inseam(min) Suggested Size(Wheel Diameter)
under 2 up to 90 cm up to 3" Balance Bikes
2- 4 90 cm - 105 cm 3' - 3'5" 40 cm 12"
4- 7 105 cm - 118 cm 3'5" - 3'9" 46 cm 14" - 16"
7- 10 118 cm - 135 cm 3'9" - 4'5" 53 cm 18" - 20"
10- 13 135 cm - 150 cm 4'5" - 5' 62 cm 24"
13+ 150 cm+ 5'+ 69 cm 26"- 27.5"

How to judge whether the children's bike size is appropriate


Correct saddle height and sitting posture Image resource Ride1Up


Frame Size vs Wheel Size

For medium-sized adults, frame size is usually independent of wheel size. Without knowing the exact size, to determine the fit of the frame, the most common method is to look at the standing height, which roughly corresponds to the length of the seam in the human body, as shown in the figure above.

Children's bikes use the wheel size to describe the size of the bike, without trying to measure or distinguish the frame size, so when you choose a children's bike, you only need to determine the height of the child, and then select the correct size bike according to the table above.


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