Stronglight crank extraction

David Damerell said:

I have been intending to remove some Stronglight cranks (with a single
bolt circle on a triple) from a bike. However, when I remove the dustcap,
I find a threaded shaft with a hex nut on it. The latter is easily removed
without very much torque - not as much as I would normally expect to need
for a crank retaining bolt on a conventional setup.

Now I find myself looking at this shaft. I have a Stronglight crank
extractor, but it doesn't seem to fit into the recess in the crank;
however, I see from Sheldon's pages that TA went to normal 22mm in 1982,
so it doesn't seem impossible that these cranks are new enough to fit my
normal crank extractor, and it turns out to fit.

However, I'm a little wary, never having seen this threaded shaft plus nut
arrangement. Is the shaft protruding from the BB spindle? Do I just
proceeed as normal with the crank extractor?

Nutted BBs are very common at the cheaper end of the market. They work
just the same except that there's less thread engagement and they can't
be made hollow.

Make sure you remove the washer from under the nut before using the
extractor!!!!

I think you are discussing Stronglight Impact. In any event, it isn't
the cranks but the bottom bracket that is causing you puzzlement.

A standard crank extractor is all you need. It makes no difference
whether the BB uses a nut or a bolt to attach the cranks to the shaft.

Andrew