Hi All, I have just had my tyres put on new neg offset -30 steelies and at about 70-80kph it shakes and turns into a pretty violent shudder. I then have to back off off until it stops. Suggestions? I have been reading the forum on this topic and it seems pretty common on the GU Patrols. Can it be rectified or should I just go back to my original Patrol alloy mags with 0 offset as it never happened when these were on, even at 110kph? Thanks in advance!