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Putting those wheel and tyres combo basically make it no difference to a typical hybrid
That was kind of my point - for a couple of hundred quid extra, you get a 29+ semi-fatty which will work on all terrain, and a hybrid which is ideal for the specified commute. If you're really going to be anal about it, you should probably swap the brake pads too, so that each set is bedded to its respective disc, but that only turns a 2-minute wheel swap into a 5-minute wheels-and-pads swap.
sounds fairly reasonable.
thanks for your advice...come the new year i think i'll invest. I'd love to try one first but they seem to be hard to track down in London.