Quote Originally Posted by brodee
No clue, I'll try to weigh one the next time I have them off. I know they are heavy. Didn't really notice much difference in performance or handling, but I don't pus this car that hard either.

On my e30 I switched from 16" t-star replicas that were HEAVY to my 15" Kosei K1's for track and can feel a huge difference in acceleration and response, but it is a lighter car and has the m20 in it.
The standardfactory basketweaves will be lighter than almost any aftermarket wheels unless you're spending big dollars to buy ultra light weight forged rims. So in reality most who fit aftermarket wheels are actually downgrading the performance of their E34's. Apart from the benefit of reduced sidewall roll of lower profile tyres on larger diameter rims, acceleration, braking and handling in general (especially over uneven surfaces) will be worsened by fitting wheels that weight more the the standard wheels. And most do weigh more... in many cases a LOT more!

So for most of us it's a classic case of fashion over function which I find somewhat ironic as we all marvel at the technical excellence of the E34 and then do our best to stuff it by worsening the original engineering!