Another option out there and the lightest one as well would be Neil and Parks. They are used on a lot of Comp Cars out there because they are so light. They are not always the easiest to get ahold of but IMO worth the effort.

FWIW more back spacing can make mounting them a bit difficult depending on whos wheels they are. As point out some back section have no teper to them which will make it harder to get the tire on.

http://neilparks.com/contact/index.htm

http://etdragracing.com/race/2015/iii_2-jegspacific/BJ_JustinLamb_AlanEllis-Comp.jpg