It was before 1970. My 1967 PX-10 has mod 93, and I've had other late 60's bikes with them. Of course that doesn't necessarily mean they weren't making mod 63 up to 1970. After all the mod 49 lasted decades, maybe even into to 80's. You're right, though, the mod 63, along with the mod 57, was perhaps the most beautiful crank Stronglight ever made. Although the old Stronglight steel cranks with their elegant slender arms were nice too.
Regards,
Jerry Moos
Bob Hanson <theonetrueBob@webtv.net> wrote:
Does anyone know exactly the reason why Stronglight dropped model 63 cranks and replaced them with mod. 93 (in 1970, was it)?
Was there actually a problem with the design of the crank arms, only discovered after all those years of production?
What a shame. I loved that pattern of the arms - flutes on each side of a central oval logo... Probably why I still stubbornly use 49d cranks on so many of my bikes, although admittedly with TA chainrings as often as not.
Bob Hanson, Albuquerque, New Mexico, USA