All scales read a little differently....
A couple of weeks ago I weighd my '05 BBS wheel and then a Rota Boost, both 17X8's...one forged, one cast. This was at my friends mail shop.
His scale stated 18 bbs, 18.7 Rota...
I mounted the Rotas up. The BBS were Gold and I wanted to have a different look, thus went with Boost in Steel Gray.
Fast forward.....My girlfriend likes the Gold so she ordered me a set of the Boosts in Gold...I guess she thinks I need multiple sets off wheels like she does shoes..
Anyway I went to a UPS shop around the corner and here you go...
Boosts 20.6....BBS 19.5....
Those scales are "very" accurate according to the manager there. However my buddy's shop did show only a 7 ounce difference...
At any rate it would appear that the worse case is the Rota weighs 17 ounces more than the BBS, accordning to the UPS scale.
This isn't a "quality" comparision...just the weights as asked by a lot of folks..
Phattey...