Originally Posted by
Small cog
Thanks for your reply Jeff, three good looking bikes there and I do like the updates you have carried out, do they use different bottom brackets? One looks like a BSA thread and the other looks sleeved down from something bigger.
Yes the term gas pipe is not exactly complimentary, I own a couple of frames made of it, Raleigh call it high tensile or 2030.
Yes, there are two different bottom bracket shells that were used on the Schwinn fillet-brazed frames:
Standard English-threaded shell used on the Superior and Sports Tourer.
”Ashtabula” shell for one-piece steel cranks, used on the Super Sport. This accepts the same bearings and crank as the electro-forged models.
On my Super Sport, I used a set of BMX adapter rings to change it to a threaded BB. The photos show the sequence of the installation. I ended up using parts from 7 different manufacturers here… because I could. This is what happens when old bike mechanics get bored.