Joined: Feb 2012
Posts: 19,362
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From: Rochester, NY
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
The answer is yes, the chain stay sockets were made to line up with 120 and 126mm spreads.
The angular difference between a 120 and a 126 socket angle is about .4 degrees, over about 405mm of stay. It's generally considered that lugs and other sockets have about 1 degree plus/minus of working range from intended angle. Almost every BB stay socket that I've worked with (not a pro so only a few dozens) needed some form of blacksmithy to open up, close down gaps or even get that stay to slide in to begin with.
Eric is correct, IMO, about miss placed obsession Re: lug/socket angles. IIRC I've mentioned before that when you start working with this stuff for real you'll see why we question your questions. Andy
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AndrewRStewart