Hi,
If you want to calculate the torque or power on wheel, you have to use something like this:
Addition of Forces=m*a
where forces involved are: Wheel force due engine & cinematic +Rolling force + Aerodinamic force + Force if you are sloping
Fwheel+Crmg+1/2rhoCxAv^2+mgsin(alpha)=m*a
Usually, you use it in a straight and you could cancel mgsin (alpha).
As Power=F*v where v is speed, you could know Power on wheel.
The problem of a bike, that Cx depends a lot of driver and his position...
Not easy to use this method in your application....
Cheers!! 
Igor R.