Originally Posted by
cavalier
This is either a test or a typo Chas. Surely you mean 86mm BCD? Haven't seen one of the later cranks in the old 23.3 extractor size. They might have just streamlined production too.
DOH! I meant 86mm BCD. I corrected my post... Thanks
I just found the definitive answers on extractor sizes from the 1982 and 1984 Stronglight catalogs:
The 1982 catalog lists 23.35mm x 1mm extractor threads on all cranks except the newly introduced Models 104 - 106 & 99 bis NM which use 22mm x 1mm.
In 1984 the catalog lists 22mm x 1mm for all cranks.
The second generation Model 99 cranks probably came in both thread sizes for a year or two in the early 80s while the old inventory was being sold out.
"NM" meant New Model while "bis" indicated drilled chainrings.
I frequently see Model 99 crank arms listed on eBay without chainrings, that's how I bought mine.
The Model 99 bis NM cranks had drilled chain rings but someone could have switched them out like I did on my Model 99 cranks pictured in the post above.
So, it's best to check the thread sizes first with those Model 99 cranks.
BTW, the regular Model 99 cranks with the 23.35mm extractor threads came in 165mm to 175mm crank arm lengths. The NM cranks were only listed in 170mm lengths.
verktyg
Chas.