If you want track wheels, the XXRs shouldnt be the ones. Get something lighter that bolts right up without all these modificiations (spacers, hub rings) plus these low offsets will likely rub
Just saw this.
First, the XXR's aren't much heavier than the OEM Y-Type wheels that came on the Cup cars...so the weight isn't really an issue. Secondly, they do not require spacers, nor do hub-rings make any difference because most after-market wheels require them (they are all made larger to accommodate many different hubs). Lastly, if a person is willing to run the proper sizes, tires, and camber, there will be no rubbing.
Front: 17 x 8.25 +25 with 215/40/17 @ -2.5° camber
Rear: 17 x 8.25 +25 with 235/40/17 @ -2.7° camber
All cars are a little different, but many guys have run this set-up without rubbing.
Also, if there was any rub it'd be in the front, so a 205/40 could be used without issue and correct it easily.
The -2.5° & -2.7° camber settings aren't required, more like -2.2° front and rear, but the 2.5/2.7 is a very good street set-up.