My duaghter has a nissan micra 1998 and complained about vibration at 60 mph and would I go out with her. We went on the motorway and at 60 there was some vibration on the steering wheel but not as bad as I thought it would be. I would normally have thought that it would be that the wheels needed balancing but these were done when she got new tyres. ( could they go out of balance?). The thing that got me was, that as we slowed down you could feel virbation through the floor rather than on the steering wheel which made me think that it isn't a wheel balancing problem but something else.Does anyone have any ideas as to what it could be. Thanks