Try getting your wheels balanced. I remember when some weights fell off one of my wheels and I noticed shaking. i could see where the weight fell off and got them all balanced again and no problems. Another thing could be a bent wheel. Go to a tire shop and get them checked out. GL

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" Despite its supercar attributes, the M5 still doubles as a soberly practical, spacious saloon - only with the ability to scare four passengers in comfort all the way to the local coronary unit". Top Gear