Bottom bracket thread?

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Retrobike Rider
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Hi there!

I'm doing a compete rebuild on my 1978 koga miyata road racer and was wondering what kind of thread the bb has. The right side cup is pretty stubborn, so before I force it I thought it would be better to check this first ;-)

Thanks!
 
Remove the Lh crank and see what's printed on the BB cup, unlikely being ITA thread tho.
You start by removing the Lh cup anyway, so if no marks of the threads are on the Lh BB cup, once this has been removed try to fit another Lh BB cup you know for sure is BSA: if the BB shell is ITA thread the BSA cup will go right trough :idea:
 

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