If you have wire wheels (as opposed to alloys) make sure that you get someone to fit / balance the new tyres who has extensive experience of wire wheels.
Paul is dead right, especially if you are suffering from St Malvern's dance. Usually carefully balancing the wheels will sort this out.
If you are within range of Sutton Coldfield, then go to Paul Harris Tyres, he's very knowledgeable about wire wheels and their correct fitting.
