Emanuel, are you interested in a "does it work and how well?" perspective, or a "should I sully my collection of beautiful classics and will the CR guys forgive me?" discussion? On the former track, I have used an old Sedis and newer off-topic units on a 6x2 friction setup, and all have worked fine. I still have a Regina BX on a Masi with a Regina CX and a NR chainset, and it works a little less well. My non-politically-correct opinion is that wear item replacement parts are permitted to be chosen based on availability, rather than based on the original OEM bill of materials. I am not doing Concours d'Elegance, but keeping nice old bikes to ride.
Ann Arbor, MI
> For those of you (like me) who enjoy riding your 1960s-70s classics frequently,
\r?\n> what are your opinions about using period-correct vintage chains (Regina Everest
\r?\n> etc.) vs. more modern chains like bushingless SRAM? And why? If you use the
\r?\n> newer chains, what do you recommend for old-style 5 or 6 speed freewheels.
\r?\n> Emanuel Lowi
\r?\n> Montreal, Quebec