I need to get some lighter 17" wheels that I can wrap in semi slicks and may have some but I am not sure if they are wide enough. I was looking at 225/45/17 RE55S for the tires but bridgestone recommend 8" rims to put them on. In experienced peoples opinions are 215's going to offer enough traction for serious cornering?

The bora is a very heavy car and for the moment at least weight reduction will be limited to the rear seat backs, spare tire etc so traction is very important but also brings into mind load ratings for semi slicks. Most seem to be lower than street tires, if 92 is the stock rating do I need that from racing rubber?