E46Fanatics - View Single Post - Adverse effects of upsizing rims and tires 2000 323i E46.
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Old 10-05-2013, 10:40 PM   #10
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Join Date: Sep 2013
Location: Mesa Arizona
Posts: 38
My Ride: 2000 323i
Originally Posted by TitaniumCranium View Post
The weight difference may literally be the equivalent of a bowling ball on each corner but where the weight is makes a world of difference. This is unsprung weight and the effect is dramatic on how the car rides, handles, and accelerates.

The heavier the unsprung weight the slower a wheel assembly is to rebound from a sudden change in surface. It's slower to respond to acceleration from the drive train also. These aren't simply mathematical differences, they're noticeable. Do a little research on the effects of added unsprung weight.

17" BMW sport wheels come in at around 18# per wheel, some of the lightest BMW wheels out there. If you're driving a 325 I would pay attention to wheel weight if you're trying to get some sportiness out of the car. If all you're after is what you think looks cool then it doesn't really matter. Up to you.
Very True. I will look into unsprung weight for sure. Thanks for the reply! Everyone on this topic has been awesome! Its a big deal issue. I love the way the BMW handles right now and drives overall. Wouldn't trade it for anything but another BMW. Def want to make sure I don't destroy it by adding extras to it.
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