I have mix of tyres on my 1997 F 205 15 rear 185.15 front. I have found the 205 availability lacking in choice. My local tyre shop can't get Toyos in 205, saying 205 55 15 is not a popular size. It appears there is plenty of choice in 195 (inc. Toyos), which begs the question of what about 195 on each corner. Would this adversely affect the cars handling/safety?