Sizing of the bikes is very important! Below are a few recommendations from RBR.

Size Recommendations:

A wheel that is too large or too small will result in an uncomfortable rider. Inseam measurements are crotch to ankle (pant leg size). These are recommended "rules of thumb" only, and not written in stone.

• 38" Standard & Classic, 48" Superior - require an inseam 28" or less
• 48" Standard & Classic, 52" Superior - require an inseam between 29" and 35"
• 52" Standard & Classic, 54" Superior - require an inseam 35" or greater

All Standard model bikes have an adjustable saddle height. The Classic model saddle can be moved up or down 1-1/2"

 

Approximate Assembled Dimensions:

Bike Style:	Length:	Height:	Width:
Mini Hiwheel	48"	46"	24"
38" Standard	57"	51"	28"
48" Classic	60"	51"	28"
48" Standard	65"	51"	28"
48" Superior	64"	56"	32"
52" Superior	66"	61"	32"