If you're going old school dog-bone Cooks cranks than you'll be looking at a bb spindle of around 122 to 127mm. I have 'em on my 91 Yo and am using a 127mm bb spindle if that helps. If you're wanting to use a newer "low profile" crankset than certainly you'll want a shorter spindle, somewhere in the neighborhood of 113 to 118mm.
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