An acquaintance and one-time race cyclist has a few 700C wheels leftover from his cycling days (I just missed out on a cache of Campy parts he gave away). I saw them the other day and thought I'd have no use for them, but Could they work on my Dawes? I'm running the original 27x1" rims with freewheel rear now. What would be the advantage? The rims themselves look fairly narrow to my nooby eyes, maybe 3/4"? One rear has a single cog on a cassette, the other has what looks like a fairly close-range cassette. If they would work I suppose the cassette would open up some possibilities for gearing changes. But what about tyres?