Cycling Equipment · Public discussion

Basic Tire Measurement Questions

Started by pcs_ronbo · · Last activity · 2 posts · 830 views

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Cycling Equipment
Published
5 June 2004
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5 June 2004
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pcs_ronbo
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  1. Original post
    pcs_ronbo
    Archived post
    #1

    A Newbie here - Have a giant OCR2, with 700x25c tires.

    What do the numbers MEAN? the 700 is... what? and the 25c is.... what?

    I ask because bad me, didn't pay attention at bike shop when the sold me most recent tube. First time, got a 700x28/32c (27 x 1.25) this last time got a 700x18/23c (27x 1.0)

    NEITHER are 700x25. BOTH seem close.

    I've only changed 1 tire in my life, and when I got the tube in there it crinkled a little bit but seemed fine. So was that a little BIG? And this other small?

    Like an idiot, I forgot to ask, and they're closed until Monday and, I've got another darn flat! (too much glass on the streets aroundhere)

    Thanks in advance

    Report
  2. boudreaux
    Archived post
    #2

    [QUOTE]Originally posted by pcs_ronbo
    [B]The 18x23 will work.It'll stretch. the 700x28/32 may be too big and would end up getting folded in the tire and possibly cause a falt.Next time look for something like a 700x20/25. 700 and 27" are the nominal wheel diameters,and the 18mm,23mm, 25, 25,28, 32, 1" and 11/4" are nominal tire widths.

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