i had the same problem with 9/16x20 stronglight 106 cranks on a PXN.
when i tried to install a pair of MKS tourings for my girlfriend to ride the bike, i found that the only pedals that would fit were the atoms that came with the bike.
i ran a set of pedal taps through them and that seemed to solve the problem, without leaving too much aluminum on the garage floor.
that said, i wouldn't recommend going back and forth between the two very often.
cheers, randy dugan van nuys, ca usa
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List, I've been assuming my Stronglight Model 99 crankset was threaded for French pedals and only just realized they're 9/16 x 20, standard English thread. However, when trying a modern pedal, it doesn't seem to want to go in. I had noticed this before, which kept me thinking they were French. The cranks are plainly marked 9/16 x 20 F. What does the "F" stand for? Did the French have their own version of standard thread??
John Hurley
Austin, Texas, USA