Don't forget Bubble balancers only provide a "static balance" (standing still, adds weight on one side of rim only)
A shop should have a dynamic balancing machine (spins wheel and tire up to highway speeds and suggests weights on inside and outside of rim)
The few times that shops have tried to get away with a static balance on my tires I have always noticed vibration at highway speeds. I think the "static balance" is an option they can click to save time on their machine but I always end up coming back and having it re-done in "dynamic mode" on at least one wheel (which I usually determine but rotation to the back axle).
Also, I always ask for stick-on weights instead of clip-on weights. It is possible to clip weights to the AVUS alloys because of the rim/lip design and these wheels usually came with clip-ons from the factory but those are special plastic coated clip-ons that protect the finish. The standard steel and lead clip-ons that shops use, they wreak havoc on our beautiful AVUS wheels.
