Most people have 195/50 15 on the cars and they seem to be the tyre size of choice, I have massive ass 4wd tyres atm on my 15 205/50s at the front and 205/60s at the back, was going to change them to 195/50 but now moving down to 14inch wheels.
What type of suspension do u have as well? this would also factor into why it is rubbing