"Unsprung Weight is a bad thing.
The more the brakes, wheels and tires weigh, the harder it is for the shocks
to control and dampen that weight.
Ride and handling suffer."

What I just quoted above took me 15/20 seconds, rather than top post the entire thread, as almost always seems to be done here? I'll have to get better at doing it consistently. Sometimes, simple adult behaviors come hard for this van-nut.

One of the reasons I bought some pretty expensive rims to replace some very heavy, relatively inexpensive rims, was not their static weight, rather their rotational weight. It's one of the reasons that some Formula 1 race cars are built with the brake rotors/discs inboard, rather than out inside the wheel/tire. I have BFG's now and those tend to be beefy and heavy and that weight/mass gets noticeably "heavier" when it's moving, rotational weight. Spacers have this same dynamic weight increase and performance and wear suffer.

bob
'87 Syncro Westy w/CV900's