Hi Scotty.  My car (2015 corolla) seemed to have a lot of vibrations.  I took it to a mechanic that I trust, and they couldn't figure it out but said the tyres looked a little scalloped so that replacing them would probably sort the issue.  I then took it to a tyre store who said the tyres were "very scalloped".   They told me to run my fingers along the tyre in one direction, and then in the other direction, and I would notice "more resistance" running in one direction, hence they were "scalloped" and causing vibrations.  To me, I thought it seemed normal that tyres would wear in that way since the wheels mainly travel in one direction? Anyway, on the mechanic's advice I bought a full set of pirellis and had an alignment done, but notice very little difference.  Was I ripped off?  The old tyres had plenty of tread left. 

To make matters weirder, after about 1200 km on the tyres, I went to get my registration sorted.  I noticed on their spreadsheet that the tyres on the right side were both 7 mm of tread, while the tyres on the left were 3 and 4mm of tread.  This could be the mechanics being wrong, since I really don't trust the outfit that did the registration (they up sold me a bunch of stuff, and said the car had a belt when I know it has a chain).  Otherwise, maybe I have a suspension issue?  It hasn't been picked up by two separate mechanics if so, so it seems unlikely.  That said, I do notice the car vibrates a bit even at low speeds on smooth surfaces, and I really feel potholes and imperfections in the road.

Sorry for the essay!!