Originally Posted by cyccommute

I don’t recall bicycles ever coming in 1cm increments but more like 2” (or closer to 4 cm) increments. Common sizes were 19” (48cm), 21” (53cm), 23” (58cm), and 25” (63cm), perhaps even a 27” (68cm). Sizes now are 44cm, 48, 51, 54, 56, and 58 cm.