Well … I have a Jubilee on a bike that was built in around 2003. The derailleur
was
probably used already by the time it was put on the bike, but it’s at least
that old. I’ve put many miles on it, including a full brevet series and one
edition of PBP. The previous owner put many more miles on it
As someone who owned a couple of Duopars back in the 1980s, they worked
better than anything else around at the time when new, but they were rather
flimsy and easily bent, and even if you managed to avoid bending them, they
wore out rather quickly in real world conditions.
The Jubilee was just
