[chung_chang]

I'm no expert but I've searched a bit on the internet. From what I've read, here are couple of points:

1. metal weighs more than rubber so more metal and less rubber usually means more total weight. I'm sure there're exceptions to this as forged wheels are very light. Certain offroad tires like all-terrain and mud-terrain with multiple steel plies may weigh more than other tires of the same size.

2. weight on tires and wheels are different from weight on other parts of the vehicle. When tires and wheels spin, weight multiplies (rotating mass). I'm not certain by what factor but I've read anywhere from 2x to a whopping 8x! So worse case, extra 10 lbs of weight on each wheel/tire becomes 320 lbs of extra static weight for the brakes to handle (10 x 4 x 8 = 320).

Again, these are from my own research on the internet and I have no prior personal experience so I could be way off.