I spent some time measuring up for the mercian. I found any increase in seat tube length would make the stand over height uncomfortable and the length of the 56 frame with a 100mm stem to be the right fit. A 58 would be too long and too tall for me. I find that high bottom brackets, short cranks and spds increase seatpost protrusion in a given frame size and aesthetically I am not a fan of frames with less than 10cm of seatpost showing and nuts on the toptube.
other option is forward sloping top tube I guess...
@scorch
I spent some time measuring up for the mercian. I found any increase in seat tube length would make the stand over height uncomfortable and the length of the 56 frame with a 100mm stem to be the right fit. A 58 would be too long and too tall for me. I find that high bottom brackets, short cranks and spds increase seatpost protrusion in a given frame size and aesthetically I am not a fan of frames with less than 10cm of seatpost showing and nuts on the toptube.
other option is forward sloping top tube I guess...