9-year-old 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.

The height of 9-year-old children is usually 118 cm - 135 cm (3'9" - 4'5"), their inner seam length is about 53 cm(min), as shown in the table below. At this time, you should choose a bike with the wheel diameter of 18" - 20", when you buy children's bikes online, such as Amazon, the size of the wheel diameter is usually listed on the product details, so when you know the height of your child, you will know which size of children's bike to choose.


Children's Bike Size Chart

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 size is appropriate


Correct saddle height and sitting posture Image resource Ride1Up



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