• the question is can I run a gran sport rear mech off a simplex type sgfter lever?

    Sure, they’re all dead simple friction shifters.
    The Simplex 51 shifts better according to some.
    Huret and Benelux are strong contenders too, Huret were more innovative and Benelux are very British.

  • That's good to know, I thought they must be compatible. Looks like I'll go this direction then. I always thought that some of the restorations etc you get on Classic Lightweights must be a bit 'wishful thinking'- all full groupsets and full top end parts throughout-not how bikes tend to evolve. I know my Dad's old Carlton he's had since a kid has had several rear mechs and is a bit of a mix-I think he said he changed the rear derailleur to a Campagnolo one after recovering it from being stolen-it certainly didn't come with one originally.

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