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Tires too big for the rims

Old 08-16-17, 07:17 AM
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Tires too big for the rims

I have an old 1978 Schwinn metrocycle that I'm trying to fix up and the old tires I took off were 26 x1 1/4 tires I bought 26 x1 3/8. I tired to put the front tire on but the tire seems to big for the rim. Any ideas or though would be greatly appreciated thanks
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Old 08-16-17, 07:39 AM
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There are 3 sizes of 26 x 1 3/8 tires. You bought the ones for Raleighs and others. You need tires specifically made for Schwinn S-6 rims. Currently Kenda is the only one making them that I know of. Roger
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Old 08-16-17, 07:43 AM
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There are several 26" tire sizes. See this page:
Tire Sizing Systems

Are your tire sizes written in fractions as above, or decimals?

Look at the original tires, and see if you see a number written on the side: 559, 571, 584, 590, or 597, or 599?

You can also measure the diameter of your rim, and add about 10mm to estimate the ISO/BSD size.
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Old 08-16-17, 07:47 AM
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Agree.. best to use ETRTO numbers , those, metric are the diameter of tire bead seat ..

Since as you found there is more than 1 fractional tire size, so using that is ambiguous..
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Old 08-16-17, 07:59 AM
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Originally Posted by fietsbob
Agree.. best to use ETRTO numbers , those, metric are the diameter of tire bead seat ..

Since as you found there is more than 1 fractional tire size, so using that is ambiguous..
This is great as a standard of practice, but nothing the OP has in her hands lists its own ETRTO.


These are the S-6 tires that Roger mentioned
https://www.biketiresdirect.com/prod...8x1-1-4-37-597
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Old 08-16-17, 08:19 AM
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The tire size was in fractions and the other number on the side was 32-597
Thanks again
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Old 08-16-17, 08:26 AM
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Originally Posted by DaisyBell
The tire size was in fractions and the other number on the side was 32-597
Thanks again
That's it -- "32-597" is the critical number in this case. You'll need to find tires that use the 597mm bead diameter. Your old tires are 32mm wide --
you'll probably want to be close to that. Suggestions given earlier in this thread.
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Old 08-16-17, 08:30 AM
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Actually a 26x1 3/8 tire at an ISO size of 590mm is smaller then the almost but not same Schwinn size 26x1 1/4 at 597mm. So the OP's statement " the old tires I took off were 26 x1 1/4 tires I bought 26 x1 3/8. I tired to put the front tire on but the tire seems to big for the rim." doesn't make sense. The 590 size won't fit on a 597 rim (or not without future removal challenges.. I've seen a number miss mounted and usually require the bead wires to be cut to remove). Andy.
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Old 08-16-17, 08:40 AM
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The tires I bought say 37-597 I knew they weren't right
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Old 08-16-17, 08:52 AM
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Is the tire too wide for the rim?
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Old 08-16-17, 10:32 AM
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The weird thing is I got the back tire on perfectly. But with front I put the one side in then the inner tuber and working the other side in, every time I end up with this gap of too much tire. Honestly I started to wonder if I have the wrong size rim due to that the bike has damage that makes me think at one time it maybe had crash or something.
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Old 08-16-17, 11:37 AM
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Do the front and rear rims have the same outer diameter? It should just take a few seconds to measure them in either inches or mm, and convert.
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Old 08-16-17, 01:03 PM
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26X 1-3/8" are commonly found in 590mm & 597mm BSD's. (Schwinn is 597)
Sounds like you may have had a 597 rim replaced with a 590 and are trying a 597 tire.
7mm*PI is 22mm, or nearly an inch. (25.4mm)
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Old 08-18-17, 06:15 AM
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Thank You everyone!!
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