My burning question of the day, at least in my mind, is whether my R7000 11-speed cassette will fit on the hub that my Sora 9-speed cassette occupies.
I find answers both ways, and I know that the best way to know is to take off the Sora cassette and try the other, and I'm working towards that.
Plan is to change the Sirrus to my 105 drive train that I took off the Domane.