Hi has anyone had this problem, i have purchased my first ever Renault for my partner yesterday which is a Clio 1.5 dci 2002 plate, my problem is when i drive at reasonable speed say 30 or 40 mph on a flat road it feels really bumpy almost like you are driving over ripples on the road, the tyres are 185/55/15 and seem brand new and don't look over inflated, would you get this effect if your tyres ar different pattern?