Thanks for this post Emilio! Loads of interesting information I was truly looking for. And you just gave me a good reason to buy the wireless unit...

I have been kindly forced by my wife to get rid of "at least one bike", as my business mission in the States is coming to an end after three years ... and I was short of argument for bringing back another 2 bikes (a gravel-backpacking Diamondback Hanjoo 5c and an aero-race Rondo HVRT CF0), having 2 more waiting for me in Europe... FINE!

So I decide to get a bike I could use for both road and gravel just by swapping wheels and tire (yes I get rid of two bikes but buy a new one...the power of negotiation). The Domane 2020 looked like the best choice and your post confirm that 100%, so I am delight by my purchase (DOMANE SL7).

Before I sold my gravel, I actually try to fit my 650x47b wheelset on the Domane and believe it or not ... it fits!!! HED rim 25mm wide + WTB Byway RoadPlus 47mm
But you definitely don't have much tire clearance (about 3mm each side at the front, 4 at the rear). What scares me the most is that 4mm that separate the tire from the front di2 derailleur... So for sure, a 47mm tire is out of the range for this bike, but a 42 to a 44 might fit just with enough clearance to enjoy a dry and rough gravel ride.
What do you guys think? Do you see any reason to prefer a 650x44b over a 700x40c or vice-versa?

I can't post photos being my first post on this forum!