Friends,
For whatever it's worth, here's what I see from examining
the spindles (and from recollections of days gone by): the
Pista BB is identical to the later 111mm, symetrical road
spindles such as the early '90s Chorus. In some situations
it will work with NR arms, much the same way as NR triples
sometimes would work with the BB meant for a double.
I don't remember any real differences between the Pista and
Strada crankarms - beyond the fact that Pista arms lacked the
supporting metal for the inside chainring. But then, I don't
have one to examine at the moment either.
Best regards,
Fred Rednor - Arlington, Virginia