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Schwinn Collegiate Tire Size?

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Schwinn Collegiate Tire Size?

Old 08-01-10, 11:05 PM
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Schwinn Collegiate Tire Size?

I am sprucing up a '74 Schwinn Collegiate Sport. One of the items on the list is tire replacement. I have a set of brand new Specialized Nimbus 26x1.50 that seem like they would work well on this bike. Although the Schwinn brochure for the bike says it came with 26x1 3/8 tires the new tires appear to be slightly to small. Even holding the old rotten tire up to the news ones shows a size difference. What gives? Was tire sizing different back then or am I just imagining things?
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Old 08-02-10, 12:47 AM
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I have a 67' Collegiate and a 71' Breeze. I haven't changed the rubber on the Breeze, but I have changed the Collegiate and they are a Schwinn specific tire size. I ended up with 26x1 3/8 S-6 tires. Someone correct me if I am wrong, but I think most of the Schwinn rims from that era used an S-5 or S-6. I bought Kenda tires, and it says S-6 on the side wall.
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Old 08-02-10, 01:57 AM
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Sheldon to the rescue, as always. https://www.sheldonbrown.com/tire_sizing.html

They're more than likely either Schwinn S-6 or plain old 590mm wheels. 590mm tires should be pretty common but S-6 tires will probably have to be ordered. You may also happen to have a shop in the area which used to be a Schwinn dealer during the '50s-'70s like I have around here. They're the only place within ~50 miles who has a stock of S-6 tires.
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Old 08-02-10, 04:17 AM
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If it does take S-6 I have found https://www.niagaracycle.com/ to be a good source.
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Old 08-02-10, 05:56 AM
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Originally Posted by sonatageek
If it does take S-6 I have found https://www.niagaracycle.com/ to be a good source.
+ 1 I go thru a bunch of them.
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Old 08-02-10, 05:59 AM
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The Specialized Nimbus tires that you have would be 559mm bead diameter, so yes, they are much too small for your Schwinn rims. Assuming the bike is original, it will have the 597mm S6 rims. Some of the Collegiates came with a 26x1 1/4 tires, which was an old British racing size that also fits the 597mm S6 rim.
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Old 08-02-10, 10:29 AM
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Old 08-02-10, 11:07 PM
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Well 11 bucks isn't bad. Thanks for the help guys!
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Old 08-03-10, 04:27 AM
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Originally Posted by MNiceGuy
Well 11 bucks isn't bad. Thanks for the help guys!
Their prices are good for everything, but shipping for just 1-2 items is expensive. Go thu their website & order all parts that you may need, & shipping costs will go up very little, if any. Standard shipping usually takes about a week from them .
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