In a "vintage" Campagnolo catalog of undisclosed (to this list) age, I noticed an odd detail regarding the NJS-approved Keirin group. The text of this catalog reads:
"In fact, even special threadings for hubs, bottom bracket, crankarms, pedals, and headsets must be used in order to guarantee interchangeability with other existing components.
So, does this mean that Campy made these groups only with ISO threads on the HS, BB, pedal, and crankarm? This would be very similar to simply providing an English threaded BB and HS, and the other parts as normal. Or does this mean that the groups were actually JIS? This would mean changing the pitch on the entire hub axleset, and the hub lockring. This could also require making 30.0mm HS cups and 27.0mm crown races. Could this possibly have been done? As I understand it, the NJS approval is a pretty strict matter.
Tom Dalton Bethlehem, PA, USA
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