I recently had a customer come back with the complaint that around 110km/hr the vehicle is very shaky after installing winter tires.
I retorqued all four tires and none of the lugs moved. Air pressure was fine and I examined the tires for balancing weights or marks where a balancing weight may have fallen off. All of them had weights and I couldn't find any places where a weight may have come off.
Customer states they had just bought the tires (used), already mounted on rims.
I know it's customary in the shop I work in (and others) to give the tire a good kick or a whack with another tire if it's seized on.
Is it possible hitting the tire with a reasonable amount of force could throw out alignment? I would assume it would only do so in an already weakened vehicle. If not - are there any other potential sources of the shake? I told the customer to go get the tires checked for balance, as that was the only possible culprit I could think of.