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Old 12-30-09, 01:10 PM   #1
jpmartineau
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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...
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Old 12-30-09, 04:21 PM   #2
dwilbur3
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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 05:20 PM. Reason: Looked around a little.
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Old 01-04-10, 09:39 AM   #3
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OK,

Thanks for the info! Very appreciated!
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Old 01-06-10, 08:52 PM   #4
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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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