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  1. #1
    medusa569 medusa's Avatar
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    Tire size wrong?!

    As a newbie rejoining the ranks of bicyclists after many years I am taking baby steps. I am very puzzled though over one think. I bought a used Hercules 3 speed bike. I decided to buy new tire and tubes and I looked at the size of the tires that were already on the bike. The size noted was 26 1 3/8. I order the new tires in that size and when I tried to place them they looked way too big. what could have possibly gone wrong??

  2. #2
    Senior Member
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    26 X 1 3/8 is not the same as 26 X 1.375. See http://www.sheldonbrown.com/tire-sizing.html

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    There is the schwinn 26" 1 3/8 which is bigger then the huffy..... bikes that also took a 26" 1 3/8 tire. You may have bought somw schwinn sized tire's.

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    Senior Member Bill Kapaun's Avatar
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    Look at the Metric sizing on the tires.
    There are 2 different sized 26x1-3/8" tires.
    590 MM & 597 MM.
    If you confused 1-3/8" with 1.375", it's going to be WAY OFF. "Decimel" sized 26" tires are used on a 559 MM rim.
    http://sheldonbrown.com/tire-sizing.html

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    Senior Member DannoXYZ's Avatar
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    The OP said that the replacement tyre was too big? MTB sized tyres in 559mm bead would actually be too small. Bigger than 26x1-3/8" would be something like 27x1-3/8" ??? What's the size printed on the side of the new tyre?

  6. #6
    Gone, but not forgotten Sheldon Brown's Avatar
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    Quote Originally Posted by DannoXYZ
    The OP said that the replacement tyre was too big? MTB sized tyres in 559mm bead would actually be too small. Bigger than 26x1-3/8" would be something like 27x1-3/8" ??? What's the size printed on the side of the new tyre?
    This is probably Schwinn's fault.

    The traditional 26 x 1 3/8" size, used on most English 3-speeds is 590 mm.

    For reasons not clear, back in the '60s Schwinn started using the 597 mm size and _calling_ it 26 x 1 3/8"!

    This idiocy has wasted uncountable person hours over the years. If the tire says "Schwinn" or "S-[digit]" on it, it will be the 597 mm size, properly known in the English system as 26 x 1 1/4".

    My guess is that the O.P. got stuck with a 597 mm tire.

    http://harriscyclery.com/590

    O.P.: See also http://sheldonbrown.com/english for lotsa info about bikes like yours.

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