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

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jpmartineau
12-30-09, 12:10 PM
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...

dwilbur3
12-30-09, 03:21 PM
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.
jpmartineau
01-04-10, 08:39 AM
OK,

Thanks for the info! Very appreciated!

michaelscycles
01-06-10, 07:52 PM
20x1 (ISO 451) (http://www.jbimporters.com/web/advanced_category_result.php?CatOneId=TIRES&CatTwoId=PNEUMATIC&CatThreeId=20in&CatFourId=20x1+%28ISO+451%29&dfadfkawe45d9drh=4&jf3l77o6la0it4oqv5gbpfdrr2) 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.