I read an article on one of road race magazine a while back where they tested a wheel that was lightened as much as possible vs. a normal wheel the particular wheel company sold on the market. The result was that even though the wheel was lighter on all four corners, the lap time was slower due to the additional deflection. The normal wheel was heavier but was also stiffer and was able to handle the loads better which led to a faster laptime. All the hard core road race S2000 drivers on the other forum I go on all use the widest wheel possible that can fit on all corners. Even though it is heavier, they are able to produce faster laps as well.