I agrre on the wheels, get some nice light alloy and why not a 3sp? if your wife is going to pull a trailer onver those overpasses she might like it, along with two brakes.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk