Hi @ , welcome to Forums! I’m Francisco from Zwift Support.
Thanks for bringing up this topic with us!
Based on this Wahoo post: Wheel circumference is set for a Speed or Speed/Cadence Sensor in the Wahoo or ELEMNT App. The wheel circumference will be set for all Workout Profiles associated with the sensor.
For the most accurate data from a speed sensor like the Wahoo RPM Speed or Blue SC, measure and input your wheel circumference in the Wahoo Fitness App. An accurate speed sensor can also improve the speed/ distance data accuracy of GPS Bike Computers like the ELEMNT, ELEMNT ROAM, and ELEMNT BOLT, especially in tree cover or near buildings.