Its worth noting that track wheels are symmetrically dished and therefore are much stiffer (laterally) than road wheels. You could get away with a much lighter wheel on the track and still have a stiff wheel.

And to those who say weight is not important....it may not be the most important, but lighter is still lighter. A light, stiff, and aero track wheel is certainly possible and, in theory, should be cheaper and easier to build than a comparable road wheel.

As I mentioned in another thread, most stock track wheels are way overpriced, probably because of low demand. I could build a light, stiff, semi-aero clincher, track wheelset for less than $400 with the following parts.

1. Niobium 30 rims ($130) (465 grams each)
2. any weight-weenie front road hub (~$70) (<100 grams)
4. any basic rear track hub (~$45 for Formula) (don't know the mass, but Nashbar/Dimension hub is 250 grams and other budget hubs should be similar)
3. sapin x-ray spokes (28 rear, 24 front) with alloy front and rear non-drive nipples, brass driveside rear nipples (~$104) (not sure of the weight, but these spokes are very light)

radially lace the front and 2x in rear

Without front skewer and rear track nuts, this wheelset should weigh less than 1500 grams.