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Anyone heard of 24x1-3/8 "F3" tire size?

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Anyone heard of 24x1-3/8 "F3" tire size?

Old 10-10-19, 05:16 PM
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1987cp
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Anyone heard of 24x1-3/8 "F3" tire size?

Looking ahead to likely getting tires for an old JCPenny bicycle I found by a dumpster.

It's a stepthrough sport tourer, drop bars with safety levers, Ashtabula crank with skip tooth big ring, and impressively cheap frame construction. Not quite sure yet if I'll actually make use of it, but I do have a 12 year old getting just too big for his very cool (and apparently very rare) ~1987 vintage 20" StreetRunner 10 ATB.


Sheldon Brown lists a good handful of bead seat diameters for "24 inch" tires, but his charts don't seem to show:

24x1-3/8 FIT TO RIM F3


I assume I can find the right size by measuring the circumference of the bead seat ... still, any guesses what BSD these are?
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Old 10-10-19, 05:43 PM
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Have got bikes with three different 24" sizes. 507, 520, 540. I'm guessing yours is none of those three, but 547.
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Old 10-10-19, 06:26 PM
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Originally Posted by 1987cp View Post
Sheldon Brown lists a good handful of bead seat diameters for "24 inch" tires, but his charts don't seem to show:

24x1-3/8 FIT TO RIM F3


I assume I can find the right size by measuring the circumference of the bead seat ... still, any guesses what BSD these are?
This charts lists a few designations but no F3. There's an EA6 that's not on Sheldons chart and it gives you the bead measurement, but it's not likely to help you source a tire.
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Old 10-10-19, 06:48 PM
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Huh, the, F8 (66" circumference) figures to ~534mm. That's interesting, anyway!
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Old 10-10-19, 06:49 PM
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Here’s a more comprehensive chart: https://www.bikecollectives.org/wiki....php?title=Rim

Looks like you’ve got 540mm rims.
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Old 10-10-19, 06:54 PM
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540 might be worth a try. Bead circumference measurements are fussy.

Thermionic Scott got there first!
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Old 10-10-19, 06:55 PM
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Originally Posted by ThermionicScott View Post
Here’s a more comprehensive chart: https://www.bikecollectives.org/wiki....php?title=Rim

Looks like you’ve got 540mm rims.
Actually has F 3. How awesome is that? Looks like this problem is solved - thanks!

I think I'll try driving people nuts by calling it a 600A. :-p
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Old 10-11-19, 10:02 AM
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On a roadbike I laced up with 540 rims, I went with 1" bmx racing tires because all I could find narrow enough was wheelchair tires or bmx tires. Worked fine.

Looks like now days Schwalbe 24x1" in 540mm are available from online retailers.. not sure if they are intended for bicycles or wheelchairs though.. not sure how much it matters. I would think the construction is different for lean angle, but maybe not. You could always step down to a 520 rim I guess if the brakes reach.

Last edited by riva; 10-11-19 at 10:08 AM.
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