Do heavy wheels make the ride smoother?
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ABSOLUTELY NOT.
Imagine that you have a ping pong ball and a basketball connected to each other via a spring. If you push the ping pong ball by two inches, it's not going to affect the basketball very much. Now if you exchange that ping pong ball for a medicine ball, moving the medicine ball two inches is going to move the basketball a heap.
If that makes sense to you, exchange the basketball for your car body and the other balls are your wheels of varying weights.
I could rattle on and on about this, but for the sake of brevity, google 'unsprung vs sprung weight' and have a read.
Imagine that you have a ping pong ball and a basketball connected to each other via a spring. If you push the ping pong ball by two inches, it's not going to affect the basketball very much. Now if you exchange that ping pong ball for a medicine ball, moving the medicine ball two inches is going to move the basketball a heap.
If that makes sense to you, exchange the basketball for your car body and the other balls are your wheels of varying weights.
I could rattle on and on about this, but for the sake of brevity, google 'unsprung vs sprung weight' and have a read.