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![](https://lemmy.world/pictrs/image/0d5e3a0e-e79d-4062-a7bc-ccc1e7baacf1.png)
To be fair, when I was little I too was guessing that “C” stands for centimeters or something metric. Now I know that “C” in “700C”, the most popular road/hybrid wheel size, stands for the third size in the French “ABCD” notation, where sizes “700A”, “700B”, and “700D” are obsolete and are no longer manufactured.
This is a great gotcha! I just recently learned that 700C, the “29er”, and (some) “28 inch” are all the same wheel.