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[fleetfoot]

After owning my e92 328i for 10 years I recently got some new wheels, tires, and springs, and I've noticed a little bit of superficial rubbing on the front tire shoulders. It's so superficial that I can rub it off with my thumb, and it completely disappears when I wash the wheels.

Here's my current suspension setup.
1) switched from M-sport springs to Eibach pro kit (already had b8 dampers)
2) installed a square set of Apex EC-7 18x9" ET31 wheels
3) mounted 255/35ZR-18 Continental ExtremeContact DWS06+ tires
4) -1.5 camber up front with m3 control arms

Question for the group:

1) Is this level of rubbing going to wear through the tires or whatever they're hitting?
2) What might they be hitting? I can't find anything in the wheel well that appear worn yet, and I never hear any rubbing even with hard driving.
3) Does -1.5 seem like enough camber for this setup or do most people run more?

[fleetfoot]

Actually I just figured out the root cause! I did a test in my driveway by putting on some tire shine. The sidewall started getting scuffed by the driveway concrete once I hit full steering lock. So the tire sidewall is just rolling over too much. I was at 32psi (BMW recommended) but I’m going to go up to 35psi to see if that will stiffen the sidewall up enough on these all seasons. Regardless, I don’t think this will cause problems long term since I’m rarely full lock.