Quote:
Originally Posted by allcaps55
About 3 weeks ago had them road force balanced. They mentioned that my rims had a couple bends but they "got the hop out" as they described for the most part. The shimmy is pretty much immediately triggered at 80mph
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I had this same exact thing happen to me. Stock M sport 18" front wheels both had a slight bend to them that allowed them to be balanced the traditional way just fine. The vibration would only start to occur at higher speeds and would progressively get worse the faster I would go. After road force testing them, I was able to see exactly where the slight bend was and compensated with wheel weights to remedy it while I waited for my new wheels to come in. Once I put my new wheels on the problem went away.
Long story short, non-M E9x 18" wheels are pretty soft and have minimal tire sidewall protection from the factory. I see cars come in to our dealership all the time with bent wheels like this.
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2011 335i N55/6MT/M-Sport
MHD Stage 2+, VRSF Downpipe, VRSF 7" FMIC, BMS Intake, BMS Chargepipe, Performance Exhaust Mod, F10 550i Clutch, BMS CDV, BMW Performance SSK, M3 Control Arms, ST Coilovers, Apex ARC-8 wheels, Michelin PS4S