I caught this over at og-made.com. Its a comparison of wheel weights versus wheel rigidity.
What they did is take a set of standard Enkei GTC-01 wheels (18x9 +22 at 23.76lbs) and compared it with a special lightened version (made specially by Enkei for the test) with the same specs but 19.8 lbs.
The cliff notes: The standard available wheel is faster around the test track by .5 a second. It even shows that even though the lighter wheel gives better acceleration, it doesn't necessarily translate into a higher top speed.
Regular High Rigidity GTC-01
Best Lap: 1 min. 4.646 seconds
Top Speed: 147.16 km/h @ 17.83 seconds
Specially Lightened GTC-01
Best Lap: 1 min. 5.045 seconds
Top Speed: 141.46 km/h @ 17.74 seconds
Full article available here:
http://www.seccs.org/members/nkoan/O...e-English1.pdf
There is probably a lot of room to break down this test (first and foremost being that Enkei made a lightweight version of their wheel to show that their production model is better) but its an interesting read to say the least.