I have some cx tires that are knobbly (Schwalbe X-one Performance). I want to ride them on mixed surfaces (crushed gravel and paved), I don’t need the aggressive tread, but they’re new and figured I could ride them for a while. I don’t really care if the knobs wear down (a lot). I have new tires waiting for this bike (file tread) and will swap when the knobby tires are spent.

Question - as the knobs wear down, am I increasing risk of flat?