Thanks for the comments guys - it is appreciated. From your comments and what I have found on the net, it looks like I can go to something like 30 inch overall diameter and about 9 inch (225mm) width without to many concerns about rubbing. Will keep an eye out for some bridgestone duelers, Yoko ...

Newbie question here. I have a 1991 Suzuki Escudo 3 door, 1.6L. I am interested in getting some increased ground clearance, and have been told increasing tyre size is one of the best "bang for buck" methods that you can do to achieve this. My question is what is the maximum rim size and or tyre size ...