If you're using the Wahoo cadence sensor, or the pair of Wahoo speed + cadence sensors, you may run into an issue where the record screen shows "0" RPMs instead of correctly tracking cadence.
Note that the Strava app will default to speed calculated by GPS and does not use speed sensor data (although it's possible to connect the speed sensor).
Please make sure you have connected your Wahoo cadence sensor under the "Speed & Cadence" option under the Strava app devices settings, as illustrated in our article on iPhone and External Biometric Sensors or Displays. If connecting under the "Cadence"-only setting the app may not read the cadence data.
A tip from our Community discussions:
1 - Remove ALL sensors, including heart rate
2 - Start by adding the cadence sensor under the speed & cadence switch
3 - Then Add back heart rate sensor, power, etc.
Post your comment below if you're still having trouble connecting and reading your Wahoo cadence data, or if you have other tips to pass along to the community.