Question on Schwinn bottom bracket cups

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Bobrowe

'Lil Knee Scuffer
I am fixing up what I believe is a 1948 BFG Schwinn. The bottom bracket was caked with grease. I usually take everything apart, clean and put it back together, but when I finally got down to the metal cups, I discovered that one of them is all torn up. When I measured the inside shell of the bottom bracket, I got 2 1/16 inches. The replacement cups I see on line say that the inner diameter should be exactly 2 inches. Will those replacement cups work on my bike? By the way, I punched these old cups out without any issue at all. I've never replaced cups before. Is it as easy as it looks?

Here is the link for the replacement cups:

Chainring.jpg


whole bike.jpg


bottom bracket cups 1.jpg


bottom bracket cups 2.jpg


bottom bracket cups 3.jpg


Serial Number.jpg
 

Archie Sturmer

Cruisin' on my Bluebird
Schwinn used the same size for years
Was that same size an oversized proprietary 2+1/16” (2.06) ID just like OP measured?
Did A&S not use common 2” interference-fit cups (2.02)?
What was that same size, (inches or mm)?

We understand the other part about Murray chain ring sprocket may fit an A&S bicycle, but might be frowned upon as an aesthetic mismatch:(
When I measured the inside shell of the bottom bracket, I got 2+1/16 inches.
That seems quite large; could it have been a fractional 2+1/32”?
Bottom brackets sometimes wear on the inside, perhaps compare the fit of the existing cups on alternately on each side to see if one side of the bottom bracket is worn more than the other, or if they are the same.
Also, understand that 2” is a nominal size, and that the bottom bracket cups should have an interference-fit, within tolerances.
 
Last edited:

Bobrowe

'Lil Knee Scuffer
This bike is going to be a rider, so the Murray chainring is okay. The wheels are also mismatched and kind of a mess. It would take a lot more than it would be worth to get it original.
 
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