PT Upload help

That sounds like a software driver issue.

Which USD driver did you installed on your computer? The one supplied with Powertap's CD ?

I figured it out. I rebooted with the PT plugged in and it downloaded fine.

Another question...I am picking up a cadence reading on the PT file despite not having the cadence sensor installed? What up wid dat?

BillM said:

I figured it out. I rebooted with the PT plugged in and it downloaded fine.

Another question...I am picking up a cadence reading on the PT file despite not having the cadence sensor installed? What up wid dat?

PT has option to supply cadence readings from either a cadence sensor or a virtual cadence calculated from the torque readings in the hub (it senses the torque pulses being applied to the drive train via the pedals and since 2 pulses = one revolution, the time between 2 pulses gives you cadence).

You can select the CPU to use one or the other or a 3rd choice whereby it defaults to cadence sensor, then Hub virtual reading if no cadence sensor data comes through. Many find the virtual cadence to be pretty useless and turn it off. For others it works OK. Virtual cadence doesn't work once you go beyond about 140 rpm as the torque sample frequency rate (60Hz) isn't high enough to effectively distinguish the 2 torque pulses per pedal revolution at such high cadences.

Thanks Alex. I am nowhere near 140 so I will put the cadence sensor on today. Thanks again.