The stock forged Rays wheels on the Track model weigh approx. 18.1 lbs. in front, and 18.6 lbs. rear.
The Nimso forged 5-spoke 18" wheels (8.5" wide in front, and 9.5" in the rear) weigh approx. 16 lbs. a piece. I don't have the exact figure, but I imagine the rear wheels must be a little heavier since they are an inch wider.
I swap out my street and track wheels/tires frequently, and you really can tell the difference. Reducing unpsrung weight is always a good thing.
By comparison, I picked up the full size spare in my '04 Audi S4, and got a hernia. That sucker must weigh 50 lbs. LOL