[Ant]

The 245/60/15 tires that are available, apart from Hoosiers are either S or T rated, that is 112, or 118 mph, not to flash, for cars that are capable of generally around 165mph.

I have gone for 235/60/15 Bridgestones H rated, and Toyo 295/50/15 with the same rating, I dont give a stuff about mixing different brands, but my local tire dealer has a Toyo 225/60/15 coming today for me to look at. The 235/60/15 is about the right size for a 7.5" rim.

Regarding tires wheels poking out of fenders or mudguards, forget going smaller in tires, as the car will look stupid if you go overboard to cure that problem, and if you get more offset to the inside of your rim that looks stupid as well. The bottom line is either shorten your suspension arms, but thats only if they are amply long enough, or do what I am doing moving pickup points and shortening my rack steering. This job is a major and requires a lot of research, making a model or using a computer program to adjust the best pivot points, and steering rack position.

My $1 worth