Tubeless tire are heavier because of a stiffer sidewall and a sealing layer, My Epic was converted to UST, after it was all done I bet there isn't ten grams difference per wheel. Running standard tires, (Which are lighter) tubeless with a little extra sealant to seal the tire and make it airtight can save some weight over a standard tube or UST setup, but I wouldn't reccomend it for heavy riders, For me the big gains in going tubeless is that I never flat anymore, and I have less rolling resistance, even at lower pressure for some reason.