Thanks Ian ( and others )
The wheels are fitted with 235/70 R17 tyres
Found them advertised on ebay fairly near to me but I don't think I'll bother with them now
a) - they are too skinny and I'll stick with my 255's till something else comes up
b) - don't really feel comfortable fitting spacers to the hubs to make them fit (just me, I'm sure they would be fine ) and don't want to fork out for another set of nuts either
Think I'll just save up my pennies and get a set of 18" hurricanes - I really like them on a Rangie