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A minor update as I only have weekends to work on my car. First thing done was actually swapped the wheel+tires. Now that flapping sound at around 40 MPH is mostly from the left side instead of right. I also checked the tires, with -2 degrees camber, the inner is worn down to almost minimum. Running the car at higher speed now came out less shock/vibration at the same high speed.
I tried to wiggle the wheel on the hub, it does not move at all. Nothing loose there.
However, as I rotated the brake rotor, there is a very faint click/tick sound. very hard to tell if it was from wheel bearing or just rotor rubbing against pads. (rotor not 100% clear of pads.)
I'll need rotor change soon (about minimum thickness now). I'll remove the caliper then and see if it was actually the bearing ticking.
The main suspect is the tire now. I will try to find/borrow a spear set just to check if different sets of tire solves it.
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