I had 15x8 Konig Flatout's that were 12.4lbs(iirc) each and Toyo R1Rs and Hankook RS3s that weighed around 22lbs so around 35lbs(believe the 35-36lbs is what I weighed) and the 14x7 RPF1s with 195 Azenis RT615K+ are 25lbs so 10lbs in my case.
I'd trade that 10lbs for the difference in grip any day of the week.