Switching from wheel-on to direct drive trainer

should I manually lower my ftp to account for the expected change to my measured power output

No. If you think your FTP will be off when you switch trainers, best to do an FTP test.


This is my first post on the forum.

My power meter pairs to the TR app when I ride. Do you have a PM? Do you pair it to the app? I would imagine that using your bike’s PM would mitigate any differences that are present between wheel on and direct drive.

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Thanks for the responses. I’m not sure I’ll be able to do a ramp test immediately; my new trainer (Zwift Hub) doesn’t come with a cassette. It has virtual shifting that I believe only works on Zwift, which means on TR I’m limited to erg mode until I get a cassette.

I don’t have a power meter at this point.

I couldnt say 100% but I suspect it will work with TR too with the ← and → keys or ERG whichever you prefer.

The ramp test is actually meant to be done in ERG mode, so it should work with the Zwift Hub One. The whole idea of the ramp test is that TR “precisely” ramps up the power in pre-defined steps, and you hang on as long as you can. When you can’t hang on any longer, you are done and TR then calculates a FTP based off of the highest 1 minute power you achieved.

If you wanted to do a 20 minute FTP test, then you would have issues.

  • Not at all. It absolutely can be done in any mode the user chooses.

  • They just need to work to match the power targets as the test progresses, by shifting and using cadence just like following any other workout.

Thanks to all, though I’m sorry to learn that I am able to do a ramp test after all :wink: