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111mm Centaur gives 42mm chainline with 75s, loads of people have used them together.
@EvenIf, I'd be tempted to dent the chainstay carefully to get clearance.
umop3pisdn
Emyr
Dolan says the two versions of the SG75 BB are both 109mm, Symmetrical
http://www.dolan-bikes.com/sugino-sg75-std-109mm-bottom-bracket.html
Jenson lists the SG75 crank as ISO, with a 109mm spindle length:
http://www.jensonusa.com/!TJ6Pk3dlamgJ-Cq-ams4pQ!/Square-Taper/Bottom-Brackets/Sugino-Black-Track-SG75-Crank
Chicken says:
Unique taper is not interchangeable with Shimano.
http://www.chickencycles.co.uk/index.php?cat=7&sub=107
Which I guess means ISO not JIS.
What's the clearance like on the other side?
Did you get the BB shell faced?
Is the frame new and/or straight?