Socket wrote:
I've gotten my new power meter (PowerTap C1, not installed, waiting on tools) and the unit is supposed to transmit cadence, but I already have a speed/cadence sensor on the bike.
Is it fine to use both? Should I replace the S/C with a speed only one? Should I just ditch the S/C completely and skip distance tracking on the trainer?
I don't think a Garmin Device can take data from different devices sending the same information. You can try and let us know what happens but I thing the head unit will probably do the electronic version of puking.
Power Meter cadence readings are dead on. They won't work without it, since power is really just how hard you push on the pedals times how fast the pedals are moving. If they didn't measure one correctly the power reading would be garbage.
As for a speed reading, you don't really need it on a dumb trainer since you are really interested in time at power. If you are using a smart trainer and graphical based software then that is different. My only experience is a Magnus trainer using Rouvey, but Rouvey needs distance to show your progress on the screen. On a dumb trainer it does this with an algorithm based on power and weight. On the Magnus it reads the speed sensor built into the trainer. We tried the dumb trainer and a speed sensor and it ignored its output. Makes sense since the speed being reported is incorrect when the program goes up or down a hill. It can't change resistance.
"...the street finds its own uses for things"