Age 6 9.
16 inch bike age range.
Most 8 and 9 year olds will fit on a 20 inch wheel bike.
As you can see both age and height are important considerations.
The best size bike for a 4 year old is either a 12 inch or 16 inch wheel depending on their height.
Beware of bikes with only hand brakes at this age because most kids have trouble operating them properly at least until after they re 5 years old.
Guide to kid s bike sizes.
Kids bikes come in these different wheel diameter sizes.
The wheel size is based on the diameter of the tire see below and as each tire size gets larger so does the size of the bicycle frame.
42 48 inches.
The 14 or 16 inch wheeled bike will be the right size for most kids in this age bracket.
34 42 inches.
Age 4 8 years developing confidence.
Age 8 12.
Similarly the right size bike for a 5 year old falls into that same range.
16 bmx bikes are a good fit for children between 3 7 and 4 6.
16 inch bmx bikes are best suited for kids between 5 and 8 years old.
An even better indicator of appropriate bike size is height.
26 34 inches.
Age 4 8.
Age range for 16 inch bmx bikes.
Tire diameter outside age 2 5.
12 inch 14 inch 16 inch 18 inch 20 inch 24 inch and now even 26 inch.
You might notice that the appropriate age range for a bmx bike is quite different from a regular kids bike.