zPower

If you're using a wheel-on trainer that doesn't transmit data—often called a “classic trainer”—you'll need to add a power meter or a speed sensor to generate virtual watts in Zwift. Once you've paired your power meter or speed sensor, Zwift takes the data from that device, and your effort in Zwift is generated by zPower, our estimated power curve.

zPower is a calculated estimate of your power output and doesn’t represent absolute power values. Due to several variables, the data you see in Zwift will likely vary from the power you’re actually generating. While picking up a power meter will help give you a more accurate experience, a Direct Drive trainer will provide you with the best Zwift experience.

zPower is not available in Zwift-organized events.

Finding zPower Events

Follow these steps to find events if you're using zPower:

1. Go to zwift.com/events.

2. Select FILTER EVENTS.

3. Select the following filter options:

   • ONLY SHOW: All

   • SPORTS: Cycling

   • EVENT TYPES: Race

4. Select APPLY FILTERS.

5. Look for events that don't include the  icon.

Setting Up With zPower

To ensure the best results when using zPower, keep the following in mind:

Selecting the wrong trainer in-game, having underinflated tires, or a loose trainer, will likely result in inaccuracies or trigger our Tire Slippage warning.

Trainer

• For each trainer that supports zPower, we've calculated a specific estimated power curve for that device. Make sure you select the correct trainer in Zwift.

  Trainer names in Zwift are based on physical appearance, not model names.

• Make sure your trainer is tightened correctly. If you have questions about the correct tension for your trainer, check with your hardware manufacturer.

• If your trainer has a manual resistance dial or knob, set it to match the value displayed in Zwift when you select the device in the pairing screen.

• For Mag trainers with a resistance setting cord, leave the cord flat on the ground.

  If your resistance setting cord isn’t flat, it can affect your trainer’s resistance.

Tires

• Make sure the tires on your bike are inflated to the correct PSI.

  Under-inflated tires may cause inaccurate readings.

• If possible, select the exact tire size in Zwift.

• Select the closest possible option if your tire size isn't listed in Zwift.

Speed Sensor

Check our our article for help etting up your speed sensor.

• Check your tire magnet is close to your speed sensor.

  If your tire magnet is too far away from your speed sensor, the sensor may not be able to track when the magnet passes, causing inaccurate readings.

• Ensure your speed sensor has enough power. If necessary, replace the batteries.

Cadence Sensor

• For a better experience, use a cadence sensor with your set-up.

Ride On.

-The Team at Zwift

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