The guys at work today were looking at my new P5 and were impressed with the "low profile" tires it had. They said that when they need to be replaced I had to replace them with the same type of tire. Low profile...I know nothing about tires. Is this true? And are low profile tires more expensive and give a less comfortable ride than normal tires? Would I need to change the rims to get normal tires on there? I didn't even notice what kind of tires were on the car. Low profile? God I'm naive when it comes to these things.