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Hey everyone, I'm sorry for the lazy post. I took photos and will add them but wanted to see if I can describe what's happening well enough to get a potential solution.
I bought 18" TSW Sebring wheels for my 2011 E550 4Matic They're a "match" with all website's 'fitment tools'
I spent more time putting the rears on and noticed the hub centering ring is maybe 1+mm smaller in diameter than the female part of the wheel it interfaces with.
On the front axle I have cheap 15mm spacers I'll replace with good ones soon but I'd call the tolerance between the male hub ring and the wheel as under a mm. I could be wrong but the fit in the front felt more precise.
I'll take measurements with a caliper this week but wanted to ask first. I noticed what I'd call subtle vibration that I didn't before at speeds above 90. That can't be right for a vehicle of this caliber and I don't remember feeling it on the factory wheels.
For clarity, the front has spacers and the rear does not. I did this because the cheap coilovers the previous owner put in were cutting into the front tires inside sidewall but not the back.
If your car side wheel hub (centering ring) is clean and no damage, it would be a 66mm OD. This value will not change, as it is made and installed on millions of Mercedes.
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REAR, brake rotor removed.
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If your wheel is made for a few cars model, it will have a bigger center bore then 66mm OD and a suitable center ring of ID 66mm will be provided, machined well, nice fit to accuracy of 0.3mm there about.
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So, you may have got the wrong centering ring supplied by wheel seller.
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