Tracking down odd steering vibration
This has been going on for a while, but I slowly just gave up trying to pinpoint what exactly it is and thinking about it is just driving me nuts again. My car currently has just under 39k miles. Back when it had about 7k miles I had gotten a set of Rays CE28 CRII black edition wheels (18” 9.5J +38 offset) paired with a set of Yokohama Advan Sport A/S+ tires (265/35). Ever since I got those installed I noticed a very faint vibration on my steering wheel. I’ve tried a few things including running hub centric rings (still on), alignment and road force balancing. None of these really helped the issue or found the cause after all this time. I would switch it out with my stock wheels with the original PS4Ss for summer and I never noticed this vibration. At first I thought it was the wheel or tire that was out of round. When I got the tires, I had it stacked on top of each other for a 2-3 months until the wheels came in, so it led me to think maybe the tire is just deformed because of how I stored it, but the road balance never found anything on the wheels or tires. The strange thing is that it’s not a consistent vibration. I’d say 90-95% of the time I notice nothing, but when I’m on certain stretches of the highway, it vibrates. Another thing I realized recently is that it feels almost as if the vibration shifts from the front passenger side to the driver side. When the steering is not vibrating, i see minor vibrations on the passenger front seat. However, when the seat stops vibrating, the steering starts to do so. Also for context I live in St. Louis, MO, so the roads aren’t the smoothest. Additionally, I have installed a H&R springs, PRL rear motor mount and switched to an ITS damper module. All three of these were installed after the wheels and the issue was present before that.
At this point I’m thinking it’s one of these things:
Change in offset going from +60 to +38
Deformed tires
Bad tie rods
Sorry for the long read, but I would greatly appreciate any feedback on this issue. I really wanna get this fixed. Worst case I may just sell my wheels and get a different set with an offset closer to +60.