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Assuming your cranks are Shimano standard, then the chainline measured between the two rings is 43.5mm and 46mm for the outer ring.
So in an ideal world you'd want a 105mm BB, but 107mm is probably as close as you'll get and will certainly be an improvement.
Scilly.Suffolk-
Ta. Will get one ordered.
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so.
double shimano 130bcd, 73mm bb, square taper jis, chainring on outer position.
for 50mm chainline would need a 118mm bb? (46mm chainline - 110mm bb -> 50mm chainline 110+4+4mm = 118mm)
not sure though if the 130mm bcd crank will clear the wide mtb chainstays (genesis io) but ideally I want to be able to use my choice of 130mm chainrings (42/43/44) with a 16t rear. (might also go bolt on cog).
many thanks.
jontea
Rodolfo
Found it, 110mm recommended with double, so 107mm to bring the line in a bit?