To find the right EIGHTSHOT, you should know your child's current size. We provide age and size recommendations for all our products. From approx. 105 cm: 16 inches From approx. 117 cm: 20 inches From approx. 128 cm : 24 inches from approx. 143 cm: 27.5 inches To be sure which bike size is right for your child, we recommend taking a test ride at one of our specialist retailers.