All:
I recently acquired a nice all-172.5 (N)R tandem crankset that has no date codes on any of the arms (it has the early style pedal threading script, all "Patent" hardware). When was the Record tandem crank intro'd? Are there 151 BCD tandem cranks?
Just curious....
Greg "always learning" Parker hot, hot, hot, humid A2 Michigan
(Geeked about getting those NOS 177.5 / 151 BCD cranks from Carsten...).