Porsche racing engineers calculated that rotating mass is only worth 1.4 pounds for every pound of mass removed. The figure of 3, 4 or even 6 pounds per actual pound removed is an old wives tale. Still, magnesium and titanium are very good friends, along with wood, plastic, cardboard, carbon fiber and aluminum.

Had a good friend years ago that said "throw it up in the air..... if it comes back down, it's still too heavy."