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So basically, the car wouldn't feel a difference if the weight of the wheels + rims are the same as the stock setup. It's like a 100KG cotton and 100KG steel story .. same thing .. but one looks heavier!
And about 20s rubbing, I believe its just how u set it up and the choice of springs!
well actually, the car wouldnt feel any different if you had 20s that were decently LIGHTER than the stock wheels, basically u want the weight across the 20" wheel to be distributed similarly to the 16" wheel.
unfortunately thats damn near impossible unless u have a VERY light tire to go along with your forged 20" rim.
do you plan on lowering your car? how low? do you want a conservative wheel fitment or aggressive? 18's can and do look very good if you're really low and you have an aggressive offset. 20's look good, but not as aggressive imo becuase you can't really get very low. i like 19's as a good compromise, you can still get low and you can have the look of a big wheel.