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@moog
I'm trying to work out the bottom bracket width that I need for my build, but it's giving me a massive headache. I can't find any information on my specific cranks after looking for an hour or so, the closest I found was this (1973 Dura Ace EX catalogue)
http://www.sheldonbrown.com/shimano1973/pages/da6.html
My cranks are Dura Ace EX (1978), they are double road cranks. I calculated my sprocket to have a chainline of 43mm.
If anyone could help that would be ace.