Ever wonder how the StagesBike gets power data from the power meters on the cranks? First, let's identify where all the computers are on the StagesBike:

StagesBike with arrows pointing to the two power meters on the crankarms

SB20 view from above with the upper PCB labeled

  • Right: This is the right power meter.
  • Left: This is the left power meter.
  • SB20: This is where the StagesBike internal computer is, inside the phone holder. It connects to all your apps, allows you to control the flywheel, and connects to the power meters.


Here is how it works:

  • The right power meter measures the power from your right leg and sends that information to the left power meter. The right power meter reports right power, so it will always look like half power when you pair to it. Because of this, you should not pair your head unit or any applications to the right power meter.

  • The left power meter measures the power from your left leg, combines it with the right side's power, and sends that as the total power over ANT+ and Bluetooth. Any device can pair directly to the left power meter to get LR power, which is what the StagesBike does (via ANT+).

  • The StagesBike pairs to the left meter and passes its data through to connected applications like TrainerRoad and Zwift.

  • The "power meter" in the flywheel is an algorithm used for control only. The power meters are the primary source of information, as they measure power directly, and the StagesBike adjusts its algorithm according to the error between the flywheel and the power meter's real values.

  • There is no need to zero reset the StagesBike itself. When you zero reset in the Stages Cycling app, the app resets only the power meters, not the bike. 

  • With power meter firmware ver. 1.6.8, we introduced an automatic zero reset, so you don't have to do it. However, in some cases, it is still best to zero reset your power meters before every ride.