You need a bike that fits you to ride at your best level. The fitting size depends on your height. I have highlighted a brief guide below for the bike size and respective rider height: • 20” bike best for riders with 4’10” - 5’6” height. • 20.25” bike best for riders with 5’3” – 5’9” height. • 20.5” bike best for riders with 5’3” – 6’ height. • 20.75” bike best for riders with 5’6” – 6’3” height. • 21” bike best for riders with 5’9” – 5’4” height.