New wheels/tires= Vibration/shaking??

[Lil bastard]

One thing, if any weights were added, with a rim that wide on such a big wheel, you can get into trouble putting all the weight in a single spot. If X amount of weight is called for, it's best to halve it and place one weight on the rimside toward the center of the car and the other toward the outer rim. A Tech may read it needs 6 grams and place a single 6 gram weight in a single spot. This can actually cause an imbalance. The Tech is ignorant of this and is just going by what the readout told him - he added the correct weight, so all must be good. It's a common mistake, especially it it was done at a commercial Tire shop instead of a Race shop. On these cars, personally, I would never take it to a Tire shop. The suspension and handling is just too sensitive and will really magnify an imbalance. The same is true of an alignment. I mean look at the guys working at Firestone and Goodyear, how much confidence can they possibly inspire? They spend 99% of their time mounting tires on Buick SUVs and Chrysler Minivans.

Also, just a note, inverting directional tires will not cause an issue at all with Tire balance. What makes the tires 'directional' is that their tread pattern is designed to channel water away from the car, throwing it to the outside. If you reverse them, you're now directing the water under the opposite tire which can cause big time hydroplaning and loss of control. This is why you want to mount them in the proper direction, nothing more.