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Sugino 75's have their own proprietary bb, different taper to iso and jis, will work with either but won't be an exact fit.
The best square taper bb you can buy is an SKF but if you want to stick with the 75's I'd get a matching Sugino BB, they have an option with sealed bearings now I think.
Rudder2-
Now that is a statement about SKF bottom brackets. I believe that skf construction is all stainless steel and aluminium including the spindle. https://www.compasscycle.com/shop/components/bottom-brackets/skf-bottom-bracket-jis-square-taper/
Await the agruements ;)
Is the brompton BB SKF?
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Thank you, that’s super helpful.
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Since when? My circa 2007 S75s are ISO... I've run them on S75 and Campag BBs with no problems whatsoever...
lynx
freddo
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Sugino 75 with a stock bb