personally i'd think the 19" rim + tires are within 5lb heavier than 18s. some said they are lighter, but i doubt if the 19s are forged?

 

None of the LS460 wheels are forged, I can measure the actual weight difference between 19" and 18" OEM wheels (have them both in stock here). I've personally mounted 19" LS460, as well as LS600hl wheels on SWB models. Bolts right on no problem. What you're dealing with, is typical dealer crap

- at