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@gbj_tester
That's more difficult to calculate, and in general I disapprove of running artificially low tyre pressure on the rollers - running the casings hot and adding extra cyclic flexion seems like a recipe for short tyre life. Also, using rolling resistance as the main load means P=kv² rather than the P=kv³ you get from adding aerodynamic drag, so any error in calculation of power results in a larger error in estimation of speed.
My eventual aims are
1: lower rolling resistance by using larger rollers
2: add aerodynamic drag using a fluid dynamic brake
3: add inertia by a combination of the above
all of this being directed towards an eventual aim of matching the speed/power and Δspeed/power curves on the rollers more closely to real cycling.