Originally Posted by
dbakl
In my experience, the threads are the same, but there could be variations. Avoid the Zeus 16mm, you can't get a wrench on them.
16mm bolts were standard from Stronglight until about 1982. Stronglight uses a wider extractor than Zeus (23.35mm vs 22.0mm for Zeus) so wrench clearance is less of an issue with Stronglight. Instead it's finding the proper extractor that is often the main problem.