I just can't see 650b presenting anything but good things, then! FWIW, I used to follow the Surly Groups page and there was a fellow who had bought a 700c Disc Trucker. He had a 559 wheelset and a 622 wheelset and changed them depending on the task. 622 for commuting and 559 for carrying a camping load into the bush. The load was significant apparently as he carried gear and food for him, his wife and their child, so the wide rubber and smaller wheel worked for him.
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