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This question already has an answer here:

where does the 700 come from and what does the C stand for in 700c?

marked as duplicate by mattnz, Daniel R Hicks, Batman, jimchristie Oct 19 '14 at 16:30

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    To be as confused as everyone else, see what Sheldon says about Tire Sizing Systems. – andy256 Oct 19 '14 at 6:03
  • This /question/ is not a duplicate. I searched. I agree it has been /answered/ within the linked questions. – user1816847 Oct 19 '14 at 17:15
  • Yes, I searched too. But now your question links to that one :-) – andy256 Oct 19 '14 at 20:22
  • user1816847 -- duplicate questions are not a problem, they are useful to users like @andy256 find questions. See blog.stackoverflow.com/2010/11/… for more info. – AnotherUser Oct 29 '14 at 3:22
  • @AnotherUser Lol. Great link :-) – andy256 Oct 29 '14 at 3:27
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As stated in this answer or this link, the idea was originally that there were 700A,700B,700C tires+wheels which all had an outer diameter of 700 mm with A tires being the thinnest and C tires being the thickest (so A had the largest rim and C had the smallest rim). Eventually, the C variant won out, and people varied the outer diameter by mounting different tire sizes on a 700C rim.

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    So, it became really a big mess. If the americans and british adopted the ISO (the [I] in the acronym comes from International) things would much easier for everyone. – João Pimentel Ferreira May 5 '16 at 12:14

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