For interest sake, I weighed the Monaco Mirabeau wheel which I have mounted on the S80 at the moment. The car felt faster compared to the Canopus wheel, but I was wrong.
The Monaco wheel is a tad heavier, weighing about 20.88 kg.
Found a nice set on eBay Kleinanzeigen for my Volvo S80 2.4T Wasa Limited edition. They are black 19″ inch Monaco Mirabeau wheels, which fit the black Volvo great. Very happy with them 🙂