Zwift only controls incline on one treadmill, the $5K Wahoo Kickr Run, (and I don’t believe that control is in the release version of Zwift yet).
The third-party app, QZ Fitness, is your only option for incline control. Zwift may have plans to expand incline control to other smart treadmills but I suspect not until Wahoo have sold a few units!
Sole S77 quality control straight out of the box… The nut that isn’t in the right place is welded on the back of the bracket… The QC passed sticker is 6 inches away LoL
I didn’t read the entire post, so apologies if this has already been mentioned. However, there’s a simple and affordable solution to achieve a negative incline on any treadmill without spending $5k on a new one.
Using a digital level (which you can get for just a few bucks on Amazon), you can measure and raise the back end of your treadmill, for example, by 3%. This adjustment will make your treadmill start at a baseline of -3% incline. From there, when you set the treadmill to +3%, it will actually be level. You can then work out the rest of the incline adjustments accordingly.
I used my iPhone for a while to bike fit and calibrate my treadmills, but it wasn’t ideal. The side buttons interfere with the measurements, and the margin of error is significantly higher compared to using a dedicated tool. That said, if not suffering from OCD, most treadmills can be offset by raising the back end about 1.8 inches for a -3%. A simple 2x4 (1.5 inches thick) should do the trick
And…if you use QZ you can actually have auto incline with this. I’ve done it. My treadmill deck is elevated 3% at the back. The app is set so 0% in game is 3% on my treadmill so therefore level. So -1% in Zwift is 2% on my treadmill but because my deck is at 3% this gives me -1% and so on.
Works like a dream. Sounds complicated but is actually really simple to do. You could in reality go further dependant on your treadmill. Mine is 16% gradient and in reality I don’t run many courses with a gradient over 10%. So I could lift my deck to 6% and have a gradient range from -6 to 10%