That means a 16-inch kid’s bike wheel always comes on the same size bike frame (barring custom or nonstandard bikes). The smallest children’s bike wheel size, a 12-inch bike wheel is usually found on training bicycles for toddlers and young kids.
There are bikes with 26- inch wheels, which are suitable for heights between 5’0″ and 5’5″. Anyone taller than that might want to look for a bike with 700c, 27,5″ (Same as 650b) or a 29″ wheel bike.
Wheel size is a very important metric if you are a child because you need to be able to stand over your bike if you want to ride it, and wheels that are too big won’t let you do that. Does Wheel Size Affect Sizing? Is a Bike Wheel Size Chart Needed? On road bikes and hybrids, no, as these bikes will all have a similarly sized wheel.