Formula, White, Stronglight, Dura-Ace

I tried the Transmission database, but, I guess, as this has to do w/ a freewheel, the situation is a bit different.

I've a Formula hub with a White freewheel. The cranks are Stronglight ST-2000 and the chainring a Dura-Ace (3/32"). Outspoken says with a 107mm JIS bottom bracket the chainline is 42mm. According to Sheldon Brown, Formula and White give 44,73mm.

I asked around and was told the real-life chainline is 42mm if the chainring is mounted on the inside of the spider.

Not sure what to think of it, but as I've no experience with the above combination, I thought it best to try this forum.

So what would be the right sized bottom bracket for a combination of Formula hubs, White freewheel, Stronglight ST-2000 cranks and a Dura-Ace chainring?

Thank you.

why not just measure it and see what it is front and back

why not just measure it and see what it is front and back

As I am a dimwit, how should I do it? Just slam the crank and chainring combo against the bottom bracket shell and go with that measurement?

As you haven't got a BB (as you don't know which to get!) then you cannot measure it.
If the rear is 45 and you mount chainring on outside with a 107 then it would be close enough.
One option is to try and get a very cheap 107 and try it out.

As you haven't got a BB (as you don't know which to get!) then you cannot measure it.
If the rear is 45 and you mount chainring on outside with a 107 then it would be close enough.
One option is to try and get a very cheap 107 and try it out.

Yeah, I haven't any bottom brackets at the moment.

I guess I could just visit a shop and ask them to sort it out for me. Might cost a bit more that way, but I doubt I'll end up broke because of it.