Wait I'm lost.. why wouldn't a set up like the teal bikes front coaster still be able o control the coaster hub?Force shouldn't be a problem. We're talking about putting the driver on its own freewheel, so it doesn't need to rotate more than the travel required to lock up the brake, so I don't see a reason why a lever couldn't be welded to the drive cog and an extension rod run over to a larger hand lever that would be within easy reach of the rider. You could make the drive lever, say, six inches long and the hand lever could be whatever—two, three feet, even. You would probably want a good spoke protector, though.
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Or did I just get lost in the discussion