It could be a combo of the new tyres and road surface. I drove a piece of road regularly which had long indentations worn in it, from having queuing trucks stood on it. On the previous tyres, I'd notice the steering tramline and grab as it encountered these surface dips.
Then I got a deal on some new Pirelli P6000s and first time on this road, I too had to pull over and check there wasn't a bulge or a flat. Something about the tread pattern gave a real "brarrp" and vibration that wasn't present with the previous tyres. But only on tramlne-y surfaces like this.
I've avoided Pirelli since (and they were oem on that car, a 9-5 Aero)
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