I've been using a Kurt Kinetic Road Machine indoors this winter. Kurt has graphs and charts that you can use to calculate power from speed. I remember reading in these forums some time ago that if you calibrate the KK so that it takes 13.5 seconds to coast to a stop from 20 mph that the power numbers from Kurt w/b pretty accurate. This morning a friend of mine came over with his Power Tap. We put it on my bike. I set my bike up on the trainer, warmed up for ~15 minutes and adjusted the roller pressure so I got my 13.5 rolldown etc. Then I did a 20 minute interval and compared the numbers. The KK says I did 285 watts and the PT says I did 249W.
Anybody out there have experience w/this? Anybody using a KK w/a power meter? I don't understand why there is such a disparity between what Kurt claims to be accurate power estimates, and what the PT says.
thanks
Anybody out there have experience w/this? Anybody using a KK w/a power meter? I don't understand why there is such a disparity between what Kurt claims to be accurate power estimates, and what the PT says.
thanks