NISMO 19" 
20.39lb front,  
20.61lb rear.  
  
Stock 17"  
23.26lb front,  
24.14lb rear 
  
Stock 18" 6-spoke 
26.56lbs front, 
26.56lbs rear. 
  
Stock 18" 5-spoke 
24.4lbs front, 
25.8lbs rear. 
  
Rays 18" Forged 
18.19lbs front, 
18.62lbs rear. 
  
18" Nismos are about the same as the Rays in weight too. 
  
  
out of interest do you know how much the GT4 alloys weigh ?