Originally Posted by
John E
I have a Stronglight cotterless puller, which I bought after buying the PKN-10. Why did they have to use an oddball size?
Stronglight
invented the square taper cotterless crank, so there was no existing standard for them to use. Why they chose that particular size is a mystery. Perhaps they got a deal on 16mm bolts and calculated that 23.35mm was an appropriate diameter for the extractor, to fit available 16mm sockets.
Another mystery is why Zeus chose to follow Stronglight in using 16mm mounting bolts, but put them in a 22mm extractor hole, requiring a particularly thin-wall socket to remove the bolts.