Is Functional Threshold Power on a bike trainer (eg. Wahoo KICKR) different than when cycling on the road?

FTP (Functional Threshold Power) can differ between your indoor trainer (like a Wahoo KICKR) and outdoor riding. Here’s why:

1. Environment Matters
   Indoors, there’s no wind, road vibration, or terrain changes. This can make holding power feel harder or easier, depending on the rider.

2. Cooling and Airflow
   Overheating indoors is common without proper fans. That can reduce your ability to sustain power compared to cooler, wind-assisted outdoor conditions.

3. Measurement Differences
   Your KICKR measures power at the trainer, while your bike’s power meter (if you use one) might measure at the pedals or crank. These can vary slightly due to drivetrain loss.

4. Position and Movement
   Riding indoors often limits natural bike movement. That can affect muscle recruitment and perceived effort, especially over longer durations.

5. Mental Factors
   Some athletes find it mentally harder to push indoors due to lack of external stimuli. Others perform better without outdoor variables like traffic or terrain.

Bottom line:
It’s common for indoor FTP to be slightly lower (or occasionally higher) than outdoor FTP. Consider testing separately for each environment if you train in both regularly.