Determining Schwinn S-something rim size?
05-28-12, 04:05 PM
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Determining Schwinn S-something rim size?
I have an old Schwinn wheel with a two speed bendix mounted in it. I assumed that this was a 26 x 1 3/4" wheel, but now wonder if it may be a 26 x 1 3/8" wheel.
I looked for a size marking on the rim, but only found "SCHWINN UBULAR S-" the stamp is faint and also down the center of rim instead of off to the side like normal, so the T in tubular disappeared into a spoke hole. I cannot make out whether it says S-5 or S-6 either.
Can I measure the width of the rim or its diameter to figure out what size tire fits it?
I looked for a size marking on the rim, but only found "SCHWINN UBULAR S-" the stamp is faint and also down the center of rim instead of off to the side like normal, so the T in tubular disappeared into a spoke hole. I cannot make out whether it says S-5 or S-6 either.
Can I measure the width of the rim or its diameter to figure out what size tire fits it?
05-28-12, 06:35 PM
#2
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S-5 is Westrick type rim, while S-6 is Endrick type. For both S-5 and S-6, the rim width lip inside dimension is 20.3mm, while the lip outside dimension is 27.9mm.
S-6 would take 26" x 1 1/4" tires, while S-5 would take 26" x 1 3/8". Both are 597mm. 26" x 1 3/4" tires fit on the middleweight Schwinn S-7 (571mm) rims .
S-6 would take 26" x 1 1/4" tires, while S-5 would take 26" x 1 3/8". Both are 597mm. 26" x 1 3/4" tires fit on the middleweight Schwinn S-7 (571mm) rims .
Last edited by Scooper; 05-28-12 at 06:43 PM.
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05-28-12, 06:40 PM
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From a manufacturing point of view those Schwinn "tubular" rims have always impressed me. I have an old New World with the S-6's , effort to find tires for them, but Styling.
05-28-12, 06:46 PM
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They could take a helluva beating. The Achilles heel was wet braking with caliper brakes, but many of these rims were used with coaster brake rear hubs or expansion brake front hubs. They weren't exactly light, either.
05-28-12, 08:46 PM
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I'll have to measure it when it gets light out. It actually looks like a combination of the pictured S-5 and S-6, it has a drop center, but with the milling pattern down the center.
