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

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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...

Quote:

Originally Posted by jpmartineau (Post 10205524)

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.

OK,

Thanks for the info! Very appreciated!

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.