Aye, I went a bit OTT with the budget for this build, but in my defence I have been very good recently I've been saving hard and I don't have any vices other than my bikes (even the PC hasn't been upgraded meaningfully for a few years now). To be honest I think I'd have been absolutely delighted with GRX mechanical or 105 hydro but ended up splurging on Di2. Hard to justify the premium for Di2, so I've just mentally blanked out the extra cost! I did look at G-Ones (although I can't quite remember which variant) as a tyre option but read some conflicting reports about wear rates - I do take this stuff with a pinch of salt, of course! They do look very nice in terms of rolling and grip, though. I'll see how the Gravelkings fare and take it from there. Another option I considered was 32mm GP 4 Seasons as I run 28s on my hybrid commuter and they've been superb, but having clearance for bigger rubber on this new frame, I thought I'd go a bit bigger My main rationale for sticking with tubes was that I know what I'm doing with them, and short of catastrophic tyre damage I know I that I can get home with a change of inner tube. Tubeless seems like one of these ideas that might end up being better in theory than in practice, or alternatively might be a dream when it works but a 'mare when it doesn't.