i recently had my tyres changed from pirellis to goodyear f1 eagles, and since then the car has been suffering really bad vibration through the steering wheel at about 80mph upwards and is worse on overrun, i have had all the wheels re-balanced but hasn't solved the problem, has anyone any ideas as to what this is, is it common

. Well my 18's have no more than 30 grams on either side of the wheel. When you check the bead mate make sure the gap between rim and tyre is same on outside aswell as inside. To be honest mate I'd say they haven't been balanced properly again. If you were closer mate I'd do it for you.