odd tyre size
Hope I'm posting this in the right forum. Recently acquired a Dawes Kingpin (non folding) in decent condition for its age. She has tyres marked 37-440 (iso sizing ?) and 500X37A (continental size ?) I can get tyres this size but they are bog standard ones with no kevlar protection. Would it be worth changing the wheels to a 37-451 - she has a very good SA AW 3 gear hub fitted which I would hate to lose. I'm a "chunky" middle aged lady who hasn't ridden a bike since I was a kid and who's looking to use the bike for town/towpath/cycle route use so performance in terms of speed is not important but avoiding flats is! Any suggestions for a novice ? (Apart from avoiding glass, thorns etc!) Thanks
PS I'm in the UK and at the moment she has French wheels and Dutch tyres!