Tom A. Thanks for the great data. I've got a powertap so have not been able to correlate for myself. I was wondering what other users are seeing with their spin down calibrations. My values seem to vary a more than I expected. For example if I do 6 consecutive calibrations I get values ranging from around 142 to 166. Also the variation is random, not increasing or decreasing as the unit warms up. I assume that since the calibration is for a unit's individual resistance it isn't necessary to calibrate before every ride, correct? I have left my correction factor at 155 mid-range for the values it spits out.
As to tigerpaws question re: pros and cons. To me here are some cons, some mentioned in earlier posts in this thread.
1. Data loss. Not often but at least 5-6 times in the 6 months I've been using it ride data was lost. I was hoping the firmware update would correct this but lost ride data just last week. At end of ride data was there, USB drive connected, flashing FAIL message, data gone. I don 't know how many others have this problem but at least two others have reported data loss on this thread. I was streaming the data to a Garmin 310xt for back up but sometime the Garmin doesn't want to connect. As can be seen above linking a Garmin is just one more thing to deal with.
2. Displayed wattage bounces around much more than I'm used to seeing on my powertap. For the last 2 months I have been synching to TrainerRoad which helps me keep a steady effort. Say I'm trying to ride at 200 watts. I find it easy to keep the displayed power on TrainerRoad ( which is also calculating power by reading flywheel speed ) steady at 200 - 205. My data downloaded after the ride shows a good steady output. However the Power Pilot is bouncing around perhaps +/- 20 watts. Since there is no lap or interval average feature to me at least it's difficult to know how well I'm holding the target power.
3. Lack of user interface polish compared to other products. Example, if you go down into a sub menu often you cannot back up but need to wait for the unit to time out and go to sleep.
4. It's starting to look like the ability for users to create workouts isn't going to happen anytime soon.
As to tigerpaws question re: pros and cons. To me here are some cons, some mentioned in earlier posts in this thread.
1. Data loss. Not often but at least 5-6 times in the 6 months I've been using it ride data was lost. I was hoping the firmware update would correct this but lost ride data just last week. At end of ride data was there, USB drive connected, flashing FAIL message, data gone. I don 't know how many others have this problem but at least two others have reported data loss on this thread. I was streaming the data to a Garmin 310xt for back up but sometime the Garmin doesn't want to connect. As can be seen above linking a Garmin is just one more thing to deal with.
2. Displayed wattage bounces around much more than I'm used to seeing on my powertap. For the last 2 months I have been synching to TrainerRoad which helps me keep a steady effort. Say I'm trying to ride at 200 watts. I find it easy to keep the displayed power on TrainerRoad ( which is also calculating power by reading flywheel speed ) steady at 200 - 205. My data downloaded after the ride shows a good steady output. However the Power Pilot is bouncing around perhaps +/- 20 watts. Since there is no lap or interval average feature to me at least it's difficult to know how well I'm holding the target power.
3. Lack of user interface polish compared to other products. Example, if you go down into a sub menu often you cannot back up but need to wait for the unit to time out and go to sleep.
4. It's starting to look like the ability for users to create workouts isn't going to happen anytime soon.