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@freddo
if you're gonna convert, then look for a cheap *road *frame, not a touring bike. you want something without mudguards, with horizontal dropouts. look for the gap between the front wheel and the fork, and between the rear tyre and the seat tube.
Bead seat diameter of 700c rims: 622mm
Bead seat diameter of 27" rims: 630mm.
27" wheels are therefore larger - if you put 700c's on this frame for example, you'll increase the gap between tyre and frame. Ideally you want it pretty tight for a good look.