I have recently resurrected my 1980's Carlton Pro-Am 12 sports. It has hung on the garage wall for the best part of 10 years, but is still in good nick now that I have done some work on it. I expected problems with perished tubes, but was delighted when both tyres retained their pressure with no leaks. However, after about 20 miles of use I find that bits of the nylon walls of the tyres are flaking off as the material has become very brittle in storage. These old tyres are Michelin Elan 700x25C which are now unavailable. Looking for a replacement pair (possibly Vittoria Rubino) I find that size 700x23C seems to be the most popular on dealers' sites. Question is: will 23C be ok as replacements? - my alloy rims are 700x17 (and I think they are 'hooked').