DamienLBC

I'm new to Mercedes and I'm looking into getting new wheels and i see there are 2 different fitment bore sizes for OEM and aftermarket...some wheels are 66.6 and some are 66.56.

So, I have searched and I'm still not getting any answers as to which size is going to work. Any help is appreciated!

Rahulio1975280C

66.6 and 66.56 should both be OK as they are extremely close.
I just did some quick Google searching and many products are advertising 66.6 and 66.56 interchangeably.

DamienLBC

Thanks for that info! .4 of a mm seems like splitting a hair...but I was looking at spacers too and some were like you said...both sizes. H&R spacers have different product numbers for the front and rear so I was confused that maybe the fronts are a different bore then the rear...
The PO of my car put after market wheels on due to the originals being completely shot. I was thinking could the new wheels be 66.6 as im getting a slight vibration around 70 mph.
So...im looking into new wheels as these were badly curbed possibly causing the slight vibration too...who knows may a road force is needed on the new wheels too. Thanks!

Rahulio1975280C

Once thing that could be causing vibrations are low quality plastic hub-centric rings. This obviously does not apply if your aftermarket wheels have the right bore size from the start, but if your aftermarket wheels are using a hubcentric adapter to take it from say 73.1mm to 66.6mm (or 66.56mm), and if that ring has since warped or was never made well from it's manufacturer, it can cause vibrations. That's not to say that you can't get great quality plastic adapters, but I recently ordered some Forgestar F14s that are bored to 73.1 and need an adapter to get to 66.6 (or 66.56) and if the rings that come from Forgestar are not decent quality, I would rather buy a nicer set then deal with vibration issues from the start.

Road force balancing is always superior, but I am a little confused as I thought most dedicated tire shops use them.

http://www.gsp9700.com/search/findgsp9700.cfm

Assuming the machine described in the above link is a true road force balancing machine, even Discount Tire locations have them. ???

I use a local Discount Tire for all my needs as they are literally less than a 1/4 mile away from where I live, but I always feel awkward taking even my 10 year old AMG there as the parking lot is usually full of some pretty standard vehicles. This car has made me snobby.