• Right, so thanks to a lead from @Big_Block, I've got some Williams C1200 Cranks, chainring and bolts on the way for this. Thanks so much for putting me in touch with the gent. The internet won today!
    My bars also arrived today. They look lovely.
    They're (just) prewar maes type. A suitable choice I think for a '46 bike I think.
    They read as follows :
    Tour de Championna
    France Du Monde
    S.Maes M. Kint
    Depose Brevete
    Bit scratched round the where someone has tried to fir them into a too small stem but reckon they should tidy up ok. Is there a definitive guide for lighhtly polishing alloy parts? Any heavy polishing would remove the engraving which is already quite faint on one side.

    Hi @ElGato, did you ever decide what the optimum chain length was for the Osgear on your Bates?

  • This is looking good!

    Getting the chain length right was a bit of trial and error. I cannot remember how many links it has got but I did join two chains together.

    I have used the same chain length with 48T and 44T chainrings and two different 3 speed blocks (one close ratio, one wide) and it worked with both setups.
    The tensioner arm does take a fair amount of chain slack.

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