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Vintage Schwinn chainring bolts?

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Vintage Schwinn chainring bolts?

Old 07-15-20, 07:39 PM
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sd5782 
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Vintage Schwinn chainring bolts?

I have 2 old Schwinn Super Sports, a 72 and a 73. The 72 is nicer, but my 73 has seen more use. My question is about stripped screws holding the big chainring and chain guard to the smaller ring. Each bike has a stripped screw and I have concerns of the others. These small bolts have a shoulder of larger diameter and then the threaded section. Iím sure with all the old Schwinns out there, someone has some advice.
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Old 07-15-20, 08:09 PM
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If you can't find replacement nuts & bolts and, it's a standard square taper crankset I'd just replace the whole crankset with a new one. There are plenty of affordable options.

https://www.sjscycles.co.uk/chainset...170mm/?geoc=US

The other thing I remember about old Schwinns is that sometimes the chain rings are stamped together with some kind of rivets and, can't be removed except with a drill bit. If that's what you have then definitely remove & replace the entire crankset.
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Old 07-15-20, 08:17 PM
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It's the steel one-piece crank with Schwinn's patented dual-plateau chainrings.

The bolts are short and have the thicker unthreaded section. Not sure of the threading, perhaps 1/4-28tpi.

Another used or discarded Schwinn like a Varsity or Continental is going to be the best source of any and all parts for these bikes. Do you have a bike co-op nearby?

I remember these bolts not allowing the pants protector ring to be removed unless washers were installed, because of the thicker shoulder section.

For the short term, a thinner bolt and nut would be a workable repair.
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Old 07-16-20, 04:51 AM
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Yep, to the co-op

That is the bolt description for the steel rings. The pant protector came off of one of the bikes 40 years ago and in my youth I see I used said bolts without washers so perhaps I damaged the threads on the smaller ring they thread into. This bike has been neglected by me, but now that I am more into this hobby as I near retirement, I canít see it looking so neglected. The other very nice, very little used bike also has a loose stripped bolt too.
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