I have a 2004 Infiniti G35 coupe with a manual transmission. Lately, I feel like my road noise might be louder than it should be, but I'm no mechanic and I don't have enough experience to really know for sure. It's not accompanied by any other symptoms, sounds, wobbles or vibrations, just the extra bit of what just sounds like low-pitched road noise. The volume increases with speed, the pitch does not.
I only start hearing it around 70km/h (40mph) and higher. I don't think the noise characteristics were any different during quick lane changes, but I'm going to double-check tomorrow.
Unfortunately, I don't have access to a good enough microphone to get a good recording the road noise (my phone mic just makes an incomprehensible mess), but I took a video of jiggle and rotation tests on jacks.
Also worth noting: I have aftermarket wheels. Nothing extreme, but the factory wheels are 18x8+30. The aftermarket wheels are 18x8.5+25. Could that difference be causing extra wear on the bearings?
I muted the video during the jiggle tests (to spare you from all my yammering), but it was absolutely dead silent; no knocking or squeaking, just nothing at all.
Do I need new bearings?