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It will be IRC I wager, but sadly I don't believe they do any 650b road/gravel tubeless yet... s
FWIW I've hammered my Formula Pro X-Guard 28s across gravelly tracks on the Isle of Wight and on the London commute – they're still going strong after 2600km. A few very minor cuts, a little wear on the rear (none noticeable on the front) and no punctures*.
*now i've gone and jinxed it.
Just wait till you try some proper tyres then.