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  1. #1
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    20 x 1 tire - What's the ISO size (written on sidewall)

    Hi,

    Can anyone tell me the ISO tire size for a 20x1 BMX tire?

    The number looks something like 37-438 (different numbers) and its written on the tire's sidewall...
    JPM

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  2. #2
    Fred J.G. dwilbur3's Avatar
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    Quote Originally Posted by jpmartineau View Post
    Hi,

    Can anyone tell me the ISO tire size for a 20x1 BMX tire?

    The number looks something like 37-438 (different numbers) and its written on the tire's sidewall...
    BMX 20 in. tires are 406, so the tire size would be 25-406. I've never seen them that narrow before.

    I did a quick internet search and found no 406s that narrow. Schwalbe and a few others have some as narrow as 28-406.

    Beware, some wheelchair tires (and possibly foreign bikes) have "20 x 1" size but these are 23-451 and they WILL NOT fit a BMX rim.
    Last edited by dwilbur3; 12-30-09 at 04:20 PM. Reason: Looked around a little.

  3. #3
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    OK,

    Thanks for the info! Very appreciated!

  4. #4
    Senior Member michaelscycles's Avatar
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    20x1 (ISO 451) Most of the tires that end in 1.95, 2.125, and so on are ISO 406. Tires that are fraction sizes, 1 1/4", 1 3/8", are ISO 451. Intense makes the Micro Knobby in that size.

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