Originally Posted by
dscheidt
No, there was an Italian pedal thread. It's, in true insane italian fashion, 9/16" X 20 tpi, with, like you'd expect, Whitworth thread form. 55 degrees, rounded roots and crests, instead of the 60 degree thread that everyone else used. A tap, or just a bunch of force, will get them to take a standard pedal.
OP: examine your original pedals; if they're Italian threaded, there's a good chance they'll say "D" on the right one, and "S" of the left.
+1. I have a set of Campy cranks (de-anodized and polished
Campy BMX) that I used with Shimano clipless pedals for many years. The pedals were always tough to install and remove- they were impossible to thread on without a wrench. I never saw any damage in the threads of the cranks so they're probably OK.