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      06-14-2012, 10:36 PM   #12
Desmoduece
ESA Vorderbau X3
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Drives: BMW Z4
Join Date: Apr 2012
Location: Spartanburg, SC

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Let's see why you haven't seen the weights before. HMM, I have a perfect answer for you. Tire specifications. An OEM tire is a more true, round, and closely balanced tire than a tire supplier will receive. The tire we get have a sticker or paint spot to indicate where the lowest point on the tire is and from the wheel manufacturer, the wheel has a sticker or stamp to indicate the highest point of the wheel. We have a machine that matches those marks to get the best combination. It is then load simulated and the radial force variance checked (vibration). Then it is balanced, if the weight to be applied is too great the assembly gets rejected. So the tires you get on the car when you buy it new are the best tires that car will ever have on it period. The balance machines used at tire shops are not as sophisticated and calibrated twice a day as the ones used at BMW and they don't have the points to match up the parts and 99.9% of the tire shops will not have a lathe and dial indicator to put the wheels in to find the high point. So we at BMW put the smallest weight we can or we reject the tire which a tire shop will not do.
My 2 cents ching ching!
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