Eavesdropping. Similar situation. Got my 2017 Giramondo 650b for a song and it has tubeless ready wheels on it. Yaaay.
but the 650x2.1 slant sixes are a huge watt suck. They carry well but ya gotta muscle them up there. Not going less than 40 wide or more than 48. Staying 650 though. Knards you say?