Quote:
Originally Posted by Dieselino
This is the deal with spacers... everyone knows the pro's, wider track = better handling, better appearance/stance etc. As far as the con's, well first you have to be sure you are using a hubcentric spacer. Because if you dont you are relying on the lugs to keep the wheel centered which is never good because it is very difficult to have the wheel perfectly centered that way and can/will cause vibration. It also adds more stress on the lugs. But even if you go with a hubcentric spacer because you are increasing the scrub radius you increase the chance of vibration (google scrub radius for more info on that). Thats not to say you will get vibration but there is a chance. As you read in some threads, many have experienced wheel vibration after installing spacers, it might also be that there is a slight problem with the wheel already and the spacer applifies that.
The main concern with spacers however is the increased scrub radius puts more stress on your wheel bearrings, which may cause them to wear out quicker. But with the mild spacers like 10 and 12mm etc, its such a small difference most will never really be subject to any of the long term effects. Of course as someone else mentioned, another negative is you will increase road blast on the side of your car and to the cars you drive infront of simple because your wheels are sticking out further.
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after reading this, i dont think i would ever get spacers...i dont know how much more you can really make the M3 better in terms of handling...i think their engineers did a phenomenal job the way it is right now