Originally Posted by
burnthesheep
You'd have to have a God awful CdA and CRR combo to only go 22mph on 240w on a flat road. Like, you'd need to be up on a mountain bike or Dutch with Gatorskins or knobbies.
So, the physics is off on your estimate. You're putting out less than you think at 22mph, and can thus go longer.
In either case without a good meter, it's still guess work. The hill is closer to reality, the steeper it is. But you'd still need to lookup the CRR of your tires. Flat? Nah. It won't work out without one.
I am not sure about that on a normal road bike on normal roads with typical parameters....on a TT bike, I can do that in around 185-190 watts.
It would take around 260 watts for a 190 lb rider, 20 lb bike tp go 22mph, Crr 0.005, CdA 0.360 m^2 with Rho 1.22
kg/m3