• What gear were you running fixed?

    If your knees were swollen at the end of the week I'd suggest a lower gear and brakes, rather than variable gears.

    Either way, putting gears on the Brother is going to be an expensive and unsatisfactory compromise.

    For pretty much the same money as that will cost you, you can pick up an old Raleigh or Peugeot that's using the same sort of running gear as you would have to fit on the Brother. The big difference being that they were designed to run it and will therefore be less hassle.

    No reason why they wouldn't ride as nicely as the Brother too.

    Alternatively, sort your hub gears out (it's not hard) and fit something like a Marathon Plus. Routine good practice such as checking for the bits of crap that gradually work their way into the tyre and running the right pressure will keep punctures at bay: I honestly cannot remember the last time I had one.

    TL/DR
    What you propose is technically feasible, but is the most complicated of all the options open to you and the least likely to produce a satisfactory result.

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