I would agree it’s certainly more difficult on a curved self powered manual treadmill, think the effort to run up a hill vs running on the flat, if you want to run the same pace, you need more effort, if you want to run the same effort you have a slower pace, 25%-35% differences is about right.
I know some people have had issues with the NPE runn, lack of cadence and pace is out, update the firmware when you get the runn as that resolves a potential issues, the others I believe are treadmill speed vs run speed being out, tricky as either or both be wrong. I know their were some issues with labels you place on the belt that fall off and others had text on their belt which were being read that caused issues.
When I was messaging Tim from NPE about the run, these were his responses.
“ Yes, the Runn should mount fine and work fine with a curved, self powered treadmill. One of our developers actually tested with a Technogym curved treadmill recently and it worked fine.
For cadence, we have an onboard circuit that is looking at motion data. The motion data is run through an algorithm which provides cadence.
The maximum speed is limited by the values that will fitness in the speed data sent over Bluetooth. This limit is 655.31 KM/H or roughly 407mph.”
“I would suggest wherever it is most out of the way for you. Since you don’t really have an incline, the angle it’s mounted on isn’t super important.”
The footpod (formerly milestone) I believe has the same issues as all footpods, from the calibration pace it’s accuracy decrease, stryd is the best in the game and they have issues, you maybe find the footpod issues tracks differently in your faster interval and easy recovery paces, calibrate it for the steady place you will run to get the best results.
Also check out DC rainmaker review on the NPE Runn if you have not already done so and read the comments, would give you a good overview of any potential challenges