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

  • 4
    To be as confused as everyone else, see what Sheldon says about Tire Sizing Systems.
    – andy256
    Oct 19, 2014 at 6:03
  • This /question/ is not a duplicate. I searched. I agree it has been /answered/ within the linked questions. Oct 19, 2014 at 17:15
  • Yes, I searched too. But now your question links to that one :-)
    – andy256
    Oct 19, 2014 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. Oct 29, 2014 at 3:22
  • @AnotherUser Lol. Great link :-)
    – andy256
    Oct 29, 2014 at 3:27

1 Answer 1


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.

  • 1
    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. May 5, 2016 at 12:14

Not the answer you're looking for? Browse other questions tagged or ask your own question.