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@FatManOnAFixie
Ta for the thoughts and info on BB's again.
Another lunchtime spent measuring and BB fettlin'.
OOOoooh, I see what you mean M_V, I can move the crank boss actually inside the BB shell housing due to the shape of the crank casting. By doing that I can get the chainline at least 7-8mm inwards which gets it down from 50mm ish to 42-43mm ish. Cookin'... I believe the correct phrase is.
A 103mm BB is the smallest I've found after a quick trawl through eBay. If it's symmetrical, that would 'buy' me 5.5mm per side closer. Well, its a start!