I think you're right, Ted. I was taking the 23.15mm dimension from Sheldon's Harris Cycle web site, the listing for the Stein Stronglight extractor he is selling. But elsewhere, in the more general discussion of French bike dimensions, he gives it as 23.35mm, which now that I think about it sounds like the correct number. Probably the 23.15 is just a typo. If Stronglight were only 0.15mm different from TA, a TA extractor would probably work OK, but 0.35mm is enough that you risk damage by using the TA extractor on Stronglight cranks. This is aggravated by the fact that Stronglight cranks are softer than Campy, preventing the frequency of brittle cracking seen with Campy, but making Stronglight more likely to seize to the crank axle. So a Stronglight crankarm may require more force to remove, which combined with a slightly too small TA extractor can lead to a stripped crank.
Jerry Moos Big Spring, TX
"Ted E. Baer" <firstname.lastname@example.org> wrote:
I was taught that Stronglight removal tools were 23.35mm (actually 23.35mm x 1.) Wanted to make sure so I checked an old "United Bicycle Tools" catalog that I have laying around dated spring/summer 1997. Flip to page 16. Third item down or the far right says: STRONGLIGHT CRANK EXTRACTOR: "Professional quality tool fits pre-1982 Stronglight cranks which had 23.35mm diameter threading. Use of any other tool in these cranks is likely to strip the threads. Professional quality. VR-22/2 $21.00."
Too HOT in Palo Alto, CA
Theodore Edward Baer
> Have I missed something? Without knowing the pitch,
\r?\n> nobody who doesn't have
\r?\n> a Stronglight extractor at hand will be able to
\r?\n> recognise the thread. You need
\r?\n> OD (which is not going to be as precise as two
\r?\n> places of decimals) and the
\r?\n> pitch either in metric or TPI.
\r?\n> Stuart Tallack in West Sussex