2015 520d f11 msport
car has a vibration around 70mph. Was serviced and motd last week no issues and no advisories.
had the wheels balanced this morning, one weight was replaced with the same weight in the same place offside and near side wheel has a new small weight added but vibration is still there.
tyres are Pirelli winter run flat tyres with about 3mm left on them, they have been on the car since I got it.
any suggestions appreciated .