I was reading through the thread and there seems to be some confusion on whether or not the Deore XT M8000 and M8100 series are compatible with the Duo-Shi spindles.
I have a pair of the XT M8020 and XT M8100 pedals and just purchased a set of used Duo-Shi spindles. Both pedal bodies thread onto the Favero spindles and can be tightened. Like @chupster98 noticed, there is a bit of a gap between the pedal body and the flat for the wrench. I’m not sure if I should be concerned about this yet. I’ll keep and eye on this to see if there are any issues with the pedal body loosening or water/dirt ingress.
The “Q factor” of the XT M8100 pedal body + Duo-Shi setup seems to be the expected +10mm increase to 65mm.
Here is a comparison of the XT and Duo-Shi spindles
And for fun, I tried out an old set of Saint MX80 flat pedals. The pedal bodies thread on but there is some interference between the pedal body and the spindle but it seems like this could be fixed by trimming a few mm from the pedal body. I bought my Duo-Shi spindles for $350 so this would certainly could be a cheaper option than the SRM flats.
