As a matter of fact I do
. Just weighed mine when doing the winter to summer swap. I do have the optional diamond cut 18" wheels though...
One wheel, with 225/40 tyre (Continental AllSeasonContact), including 5 bolts was 23.1kgs (50.9lbs).
My summer setup (BBS XR 18" with 225/40 Conti PremiumContact 6) including its own bolts is a bit lighter, at 21.5kgs (47.4lbs).
Upon browsing TyreReviews' website, I do suggest to opt for the newest PremiumContact 7 by Continental if you're looking for a light tyre that'll also last you a while. They are approx. 0,5kg lighter than their best contender in the most recent test.