Must say I wasnt sure about the tires myself at first.
It took me some time before I made the decision to put modern tires on a classic racebike.
This decision was made easier because the bike wasnt very original when I got it.
The old tires where starting to decompose so they simply had to go. I decided to give the bike a more modern feel to it using these 'new' (skinny) tires instead of more original ones.
I think it does make the bike look a lot more faster and gives it a more modern feel.
I know some of the purists may not like it, but the intention isnt to build a museum piece but a nice bike to ride.