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bujalarab
Feel like it depends on your tolerance for mud a bit and the actual shape of the tyre on the rim. There are pics on the internet of people wedging 1.9 and I'm sure I saw some 2.1s in somehow.
I also intend to try this this winter. But I have a sense that maybe the actual answer if you want a CDF with 650b tyres is a Fugio.
https://www.bikeradar.com/features/genesis-croix-de-fer-853-br-builds/ this is a modern CDF frame clearing 47s, just about.