Conversion? My answer would be yes...no... maybe. If you plan to tour, especially on
unimproved or questionable surfaces, The answer is a definite yes to 700s,( at least
if you travel in countries where they are readily available). 700s offer a wider selection
of tread design & quality. They may be hard to come by in many third world countries.
No if you're a serious vintage guy trying to preserve authenticity. I ride both 27s & 700s.
I'm in love with my 40 year old French steel, Rigida/Normandys. It's an aesthetic thing
I can feel when I ride.... BUT I tour on 700s because 27s are about asphalt. There are
a few 'off road 27s', but they're not really, & very poor on asphalt.(bin der)