are you sure the frame isn't just small for you? I also agree I see little to gain from the 650 bit and also brake reach (unless you plan to abandon the cantilevers) will be a huge headache
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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