it all depends on what tire you have, cause different tires, even if they're the same size, can weigh differently.

and which LS rims are you talking about?? there were a couple...but they should all be somewhere around 15-16lbs each...not too light. find a pic of the wheel you're looking at and maybe someone will be able to tell ya

my old wheels, '96 SE wheels with 195/60r15 Pirelli P4000s weighed in at 35 or 36 each, so your wheels should be within a pound or two of that.