According to tirerack, for the Bridgestone RE050A, a 245/40/19 weighs 29lbs and the 275/35/19 weighs 30lbs.
So the front wheel weighs, 23.2lbs and the rears weighs 26.8lbs.
Perhaps the scales are off, but Nissan did advertise these wheels as 20% lighter. Not sure which wheels they were comparing to, but that doesn't look to hold true from this info.
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