Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
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What do you mean when you say a 73mm bottom bracket is too small for the threading?
I'm betting you mean it's too small in diameter. If that's the case, it's because you need an Italian threaded bottom bracket. They're easily available but just uncommon enough that it might require a special order by your LBS. Be careful when you install it because both sides are right hand threads. Be sure to get the right side on nice and tight.