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Thanks for providing these data! So the 18" wheels (rims + tires) are 1.9 and 1.6 lbs lighter (front/rear), for a total of 7 lbs. less unsprung weight. That is bordering on significant.
We have reliable weights on the rims from BMW:
18" 513M
front = 8.92kg (19.6lbs)
rear = 9.44kg (20.8lbs)
19" 437M
front = 10.4kg (22.9lbs)
rear = 10.6kg (23.4lbs)
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