Originally Posted by
Numberfourson
How about the likelihood of two otherwise identical Zeus cranks having two different threads?
Shimano SPD pedals thread easily into one crankset but won't thread into the other .
Two different bikes same model crankset same model bike.
Really don't want to tear up the threads wrenching them in.
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Did you try another set of pedals in the cranks that the first set of pedals did not fit? Can you thread pedals into the crank from the back side? Try these things- it will help us diagnose the issue.
To answer your question: yes, it's possible that they are different thread if one set is English thread and the other is French. This is highly unlikely though.