Originally Posted by
T-Mar
Yes, Simplex introduced the hangerless 881/881B rear dropout set circa 1962. They remained in production into the late 1970s. They were a topic of discussion in a very recent thread.
Yes, and would that all vintage French bikes come with them, so the owner could use any derailleur without resorting to any of the various work-arounds necessitated by the integral-Simplex-hanger versions.