As standard my car has 185/55/R15's on and it is due for new tyres since they're almost on the limit, the problem is that they're expensive for what you get in this size and there isn't as much choice. I'm currently looking at some 195/50/R15's (Goodyear F1 for £35 a corner) but was wondering how much of a difference the 50 profile will make compared to the standard 55, I know the rim will take 195 so that's not a concern. I did search before I posted but I couldn't see anything that would tell me the speed difference between profiles, shouldn't be an issue hopefully.