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if he's doing a rollers hour record why use discs? wouldn't be better to use some lighter wheels?
As @umop3pisdn says, spoke drag is nearly all of the aerodynamic drag on rollers, hence the 48 spoke wheels on my RollerFort, which really do provide a lot of extra resistance compared with 36 spokes. I've used the front Hed 3 on the rollers too, and that's ridiculously easy to spin compared with even the 36 spoke wheels.
Lighter wheel on the rollers would be pointless, even if they weighed nothing you'd still only cut rolling resistance by a couple of percent. Heavy wheels are much nicer, as riding on the rollers has very little inertia and every little helps to smooth out any choppiness in your pedalling. Smoother pedalling isn't really an end in itself, but in my experience more inertia does make roller riding more comfortable.
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gbj_tester
if he's doing a rollers hour record why use discs? wouldn't be better to use some lighter wheels? not that it matters with that gearing but it seems counterintuitive :)