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Trainer accuracy after calibration

Posted: Mon Sep 14, 2020 12:59 pm
by henryjchurchill

I recently tightened the belt drive on my Direto trainer. The calibration value was 6527 and the value under the trainer was 6532. After a few turns I managed to increase the tension to 6532 during calibration on the Elite app. I have since found however that my power output is markedly lower when using Zwift. I seems to have dropped around 30-40 watts. Could this be due to the tightening? Unforunately I don't have a second power meter to verify the accuracy so I'm unsure as to whether the trainer was accurate before or after the adjustment.

I also find that my power in Zwift fluctuates quite a lot (+-20 watts) even though my perceived effort is the same. Could this be due to tightening or perhaps the connection with Zwift software?

Re: Trainer accuracy after calibration

Posted: Thu Sep 17, 2020 12:10 pm
by Elite Admin S

Fluctuations of around 20W is normal, it's due to the difference between one pedal stroke and another.
Even pro riders have at least 10-15W oscillations.

About power, it is more probable that the values you have now are the correct ones.
If the offset value matches the original, power will be very accurate.