I think 16" are popular but you may need 17" to clear the front brakes and you can also change the offset. The main issue for tire fitment is the front spring perch as the clearance does not change between the hub and the bottom of the perch even with a lift (spring or strut block). So for example, and to be confirmed, you could get a 17", possible 16", rally type of wheel with reduced offset and that would allow more rubber to be fitted.