Re:
That's a Stronglight 99 chainset, from 1970-77, which takes 86 mm BCD chainrings
Note that the extractor threads on it are 23.35x1mm. A normal 22mm extractor won't fit. Please can you tell me if these threads are in good condition?
Are you sure the arm lengths are 150mm? As far as I know, the shortest they did were 165mm.
Thanks