Max. power on Tacx bluematic with garmin speed and cadence sensor

Hello all,

I’m having a few issues with my setup as I can’t get my max power above 383 watts.

Before you tell me to pedal harder, I recently changed my chainring to a 58t to try and deal with this. My reasoning was that I was doing most of my riding in the lowest gear on the old 50-11t set up because the resistance on the bluematic is only set to 3 (as per the setup guide when I add the trainer to zwift). If I add more resistance to the trainer it’ll mess up my stats on zwift, so I figured the best solution would be to increase the ring size so that spin the wheel faster and so generate more power.

On the original set-up, I was hitting 383 watts at around 115 rpm cadence.

The new setup allows me to hit 383 watts at 100rpm, but if I increase my cadence up to 120 the power figure actually drops by 3-4 watts.

Is this just a limitation of riding on a dumb trainer with a speed sensor? is the sensor struggling to pick up the speed because the back wheel is spinning at 65-70kph at this point?

You are probably at the upper limit of the trainer power curve.

Did you solve the issue?
Same happening to me with Tacx Matic and Garmin speed & Cadence sensors