The thread diameter on Stronglight is 23.35 mm while the TA is 23.0 mm. Both have the same pitch, I believe. The TA extractor will thread into the Stronglight arm, but will not completely engage the threads. You may get away with it, but there is a chance you will strip the threads, expecially if the crank has partly seized to the axle. Stronglight cranks seem more prone to seizing on axles than Campy cranks, probably because the alloy is a bit softer. This, in my opinion, is also why Stronglight cranks did not crack with anything approaching the frequency of Campy. Of course, a crank can be seized up so tight that even the correct extractor will wind up stripping the threads, but using a TA extractor on a Stronglight crank increases the risk. All this discussion is in reference Stronglight cranks manufactured before 1982. After that date they switched to "modern" 22.0 mm extractor thread. The fact that many Stronglight models were manufactured for many years leads to some real adventures in threading. A given model can be either 23.35 or 22.0 extractor thread with either French or English pedal threads. I've observed all these variations on models 99 and 104, for example.
Regards,
Jerry Moos
Houston, TX
Hi, Jerry Moos kindly warned the group not to use TA extractor tools on Stronglight cranks. Maybe I have just been very lucky, but I have disassembled many a 49D equipped b/b, and I have always used a TA tool. It has always worked a treat.
Have I overlooked something?
Yours, Toni "puzzled" Theilmeier, Osnabrueck, Germany.