Official Forum

Hi,

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?

Hi

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.

Regards