Hi, I believe the tyres take some of the bumps out of the road and work in conjuction with the suspension. Putting low profile tyres on, for road use, will cause addition wear and damage to the car. The guys here are a lot more knowledgeable then I am, so they may have different advice. I've kept the original wheels on my 308, but I like it original. I've seen some very low profile tyres on 308's but, soz, can't tell you the size.