Why is 27" bigger than 28" bicycle tire?
28" = 622mm diameter
27" = 630mm diameter
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Originally, the tire was measured in the pumped-up state. The outer diameter of a balloon tire was greater than the outer diameter of a racing wheel tire.
Therefore: balloon tyres := 28″, racing tyre := 27″.
Rennrad is also thinner, but that’s all? As far as I know, the diameter is measured inside and not outside
It used to be different.
Nowadays the rim diameter is given – 622 mm (28″) or 635 mm (27″).
But if you think: 28″ are over 71 cm, not 622 mm.
With the sizes according to ETRTO, at least some light is turned into the dark.
That’s what it is today
As I said, it was different in the early days of the bike.
26″ was not necessarily 26″ because of different rims.
https://www.sheldonbrown.com/26.html
rim diameter makes even more sense. Otherwise you never know if the tire fits