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Schwinn S6-S5 tire question w/ pic

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Schwinn S6-S5 tire question w/ pic

Old 11-07-08, 11:47 AM
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uprightbent
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Schwinn S6-S5 tire question w/ pic

Just picked up this 1980 Collegiate 3 with the owner's manual stuffed under the saddle for only $60 on Craigslist. It appears to have almost never been ridden.

The original tires had cracked sidewalls and the only S6 or S5 tires I could find without ordering online were some Cheng-Shin gumwalls (26 x 1 3/8)

They popped off the rim as if they won't seat the bead properly after about 2 days riding at proper pressure. And I know they are the correct size. Is there any trick with buying and mounting these odd Schwinn sizes I never knew existed before finding this bike? Or should I get a better brand?

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Old 11-07-08, 12:32 PM
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tcs
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The Schwinn S-6, 26x1 3/8 has a 597mm bead seat diameter. Modern tires of this size will have something like "ISO 38-597" molded into the sidewall.

The "rest of the world" E.A.3, 26x1 3/8 size (a.k.a. "650A") has a 590mm bead seat diameter. Modern tires of this size will have something like "ISO 38-590" molded into the sidewall.

BTW, I know you said you were sure the tires were the right size, but the Schwinn S-5 is designated 24x1 3/8 and has a 547mm bead seat diameter.

Another thing to insure is that you are not using a old straight wall rim with a modern tire that requires a "hooked bead". Higher pressures will make this combination walk apart.

HTH,
tcs

PS - If you want this bike to be a rider, I'd replace the steel rims with some aluminum E.A.3's (like the Sun CR-18).

PPS - Lovely bike. I like the "sporty" fenders, even though they aren't as useful as full ones. You might also want to oil the Sturmey.

Last edited by tcs; 11-07-08 at 12:36 PM.
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Old 11-07-08, 12:35 PM
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How much pressure are you putting in them?

-Kurt
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Old 11-07-08, 01:09 PM
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I thought the Schwinn size was 26" x 1.375".
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Old 11-07-08, 02:32 PM
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Schwinn did use a 26 x 1.375 tire on pre war lightweights. It is a different size than either of the other two 26 x 1 3/8 sizes. It s bead seat diameter is 599 mms. This not a commonly found tire. For the poster who said S-5s were 24 inch rims they were also available in 26 inch rims. Roger
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