20" kids bikes are slightly larger than the 16" frame and can accommodate older, taller children. These bikes may have hand brakes, in addition to the coaster brake, to help the child learn to use their hands to slow or stop.
- 1 Measure the diameter of the existing tire, as illustrated above (D), or look on the tire for the size (it looks like this: nn" x n.n").
- 2 If you find the tire size, the first dimension is the tire diameter, the second dimension is the tire thickness.
- 3 Record the tire diameter, as this also represents the bike frame size.
- 4 Select your bike size from the drop-down on the right to see a rider chart.
Once you know your bike's frame size, select it from the drop-down to see how tall riders should be to use this bike.
Wheel Size (D) - This is the outer diameter of the wheel, with the tire installed on the rim.
Kids Bike Sizing (in) - Kids bikes are measured in inches.