Your rear tires may be out of balance ever so slightly, Im not sure if it is possible to have perfectly balanced tires. On my Integra, I got a set of 4 new tires and had the tires balanced before I took a trip down to Fort Lauderdale, well the car drove smooth as silk up until around 85mph where the steering wheel started shaking alittle bit. Anyways, why are you driving 190km/h in the first place?

------------------
Adam,
1986 300E