For Height 4-11" - 5'3" bicycle frame size of 13 - 15 inches; for height 5'3" - 5'7" bicycle frame size of 15 - 16 inches; for height 5'7" - 5'11" bicycle frame size of 16 - 17 inches; for height 5'11" - 6'2" bicycle frame size of 17-19 inches; for height 6'2" - 6'4" bicycle frame size of 19 - 21 inches; for height 6'4" and taller bicycle frame size of 21+ inches