The change in extractor threading took place in the early 80's, perhaps 1982 or 1983. Some models including 104, 105 amd 99 can be found with both the old Stronglight and the new ISO threading. This makes for some interesting times, as one can acquire a used crank with mismatched arms, each requiring a different extractor. Throw in the French versus English pedal threading, and it gets REALLY interesting. I've encountered this myself. In general, one would be more likely to find the older more square mod 99 with Stronglight thread and the newer more rounded mod 99 with ISO, but don't count on it, as I don't think the two changes were at the same exact time. Best way to check is with a dstcap for an ISO 22mm crank. The cap will engage an ISO Stronglight arm, but slide loosely into an old Stronglight-threaded arm.
Regards,
Jerry Moos
Big Spring, Texas, USA
> From: Greg Weiner <geedubbayoo@gmail.com>
\r?\n> Subject: [CR] When did Stronglight cranks move to British/ISO thread?
\r?\n> To: classicrendezvous@bikelist.org
\r?\n> Date: Wednesday, November 4, 2009, 11:36 AM
\r?\n> I'm wondering specifically about
\r?\n> Stronglight 99 cranks. Is there a
\r?\n> difference in the crank arm threading (for an extractor)
\r?\n> between the
\r?\n> older cranks (highly polished, bigger flute w/ finer grain
\r?\n> pattern)
\r?\n> and the later ones (less polished, smaller flute, rounded
\r?\n> edges)?
\r?\n>
\r?\n> On this page the older crank is the top image, the later
\r?\n> crank is on bottom:
\r?\n>
\r?\n> http://www.classicrendezvous.com/
\r?\n>
\r?\n> Thanks,
\r?\n> Greg Weiner
\r?\n> San Francisco, CA, USA