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      04-11-2013, 07:37 PM   #6
BillionPa
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Drives: 335i
Join Date: Feb 2013
Location: USA


Posts: 288
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The wheels were road force balanced at the dealer (aftermarket wheels) and then installed with new ECS hub rings

a hub ring is for when the wheel bore is larger than the wheel hub diameter, in order for it to be centered. the problem with the ECS rings is that they were beveled on the side facing the hub, and there was about .5mm of plastic where there should have been none, so the wheel did not touch the rotor, allowing it to shift position when driving

this caused shaking behaviour from 30 to 80mph, that went and came as it pleased, and then caused the rotors to warp to hell in about 4 months