H&R has three different models of 8mm spacers.
1 - One model does not have a lip
2 - Hubcentric Version 1 is both hubcentric and wheel centric. 135mm od. (OEM VW/Audi wheels Only)
3 - Hubcentric Version 2 is like version 1 except it has a 150mm od for a larger rotor surface.
My guess is you have #1, as it has no lip and is for aftermarket wheels. If the hubcentric ring for your BBS wheels does not sit on the actual OEM hub, this is likely the source of your vibration. (I'll add, if you recently had new tires mounted, it could very well be as simple as a poor balancing job.)
Even more info: I have 8mm Version 1 above. In my hand I test fitted a hubcentric ring on it. It would not fully seat on the spacer as the spacer has a angle entending from the base to the lip. However, my 15mm H&R spacers do not have as sharp of an angle from base to lip, so the hub ring would sit perfectly flat. In the pic below you can see the angle on the lip. It's funny because you'd assume the angle is the same, but it's not.
So here is what I determined: I couldn't run 8mm Version 1 with aftermarket wheels as I didn't like that the ring wouldn't fully seat. I couldn't run 8mm the non-hubcentric (#1) as they didn't have a lip and the ring wouldn't quite reach the oem hub with the spacer on. I know guys who mod the hubcentric rings to sit flat, didn't want to deal with it though. 18x8.5 CH's...et35? you really need spacers?
If this makes me a 'spacer nut' i'd appreciate a rep for being one.
H&R 8mm Version 1
H&R 15mm
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