Conti GP5000 28 actual width on 21C and 25C rims
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  1. #1
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    Conti GP5000 28 actual width on 21C and 25C rims

    Anyone out here measured actual width of Continental Gp5000 700x28C tires on 21C or 25C rims, around 80 psi?

  2. #2
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    Quote Originally Posted by igs532 View Post
    Anyone out here measured actual width of Continental Gp5000 700x28C tires on 21C or 25C rims, around 80 psi?
    You have to be more specific about the rim because not all "21 mm" rims are the same width. And even if you are more specific, new tires will measure differently than tires with miles on them. And then you have to hope that somebody has the same rims and tires mounted as you request.

  3. #3
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    "mm" not "C". All modern road rims are 700 "C" and everyone knows this. Tires for these wheels should be referred to as 700 x XXmm, not 700 x XXC. The width of the rim should also be referred to in mm, and for tire width questions you should use the internal rim measurement.
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    Quote Originally Posted by cxwrench View Post
    "mm" not "C". All modern road rims are 700 "C" and everyone knows this. Tires for these wheels should be referred to as 700 x XXmm, not 700 x XXC. The width of the rim should also be referred to in mm, and for tire width questions you should use the internal rim measurement.
    ^^^^This^^^^

    It drives me nuts to see tire sizes referred to as XXc and not mm, and I could walk there.

    And now rim width. AARGH .
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  5. #5
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    Quote Originally Posted by velodog View Post
    ^^^^This^^^^

    It drives me nuts to see tire sizes referred to as XXc and not mm, and I could walk there.

    And now rim width. AARGH .
    It doesn't help that so many tire companies have no clue. Rim sizes are described as 650A, 650B, 650C, 700B, 700C. Tire sizes are obviously the same, but must include the width. If you're going to label a tire properly it should be '700C 25mm'. 700 x 25C is just dumb.
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  6. #6
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    Quote Originally Posted by cxwrench View Post
    It doesn't help that so many tire companies have no clue. Rim sizes are described as 650A, 650B, 650C, 700B, 700C. Tire sizes are obviously the same, but must include the width. If you're going to label a tire properly it should be '700C 25mm'. 700 x 25C is just dumb.
    Don't know why tires are labeled this way 700 x 25c when they should be labeled 700c x 25. Not to mention that 700c is used when the actual rim diameter is 622mm. 700c = 29 = 622mm and 650b = 27.5 = 584mm. More confusing than car tire sizes.

    igs532,

    In order to help you clear the confusion, Sheldon Brown explains it well here. After reading this page below, you will either have a clearer understanding of tire sizes or your head will be spinning even more:

    https://www.sheldonbrown.com/tire-sizing.html

    And yes, another thing that drives me nuts is rim manufacturers that use the external width measurement. External rim measurement is totally useless. INTERNAL rim measurement is the one that will affect the actual width of your tires once mounted. I don't give a rats arse what the external rim width is.
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