- A child should stand flat-footed on the floor and straddle the bike.

- At that point, the child should have a minimum of 2" clearance between their inseam and the top bar of the bike's frame. If there is no top cross bar on the bike's structure, the same 2" rule should apply while imagining a bar in place.

- The following general guidelines can also be used as a reference when determining the right size bike for a child, dependent on age and height:

- Ages 1½ to 4 (26" tall to 38" tall) = 10" and 12" bikes

- Ages 4 to 8 (34" tall to 48" tall) = 16" bike 

- Ages 6 to 11 (36" tall to 54" tall) = 20" bike

- Teen (54" tall to 60" tall) = 24" bike