How knobby? Schwalbe Marathon iterations might work for you, or their Delta on the cheap end of things, but it doesn't have the most aggressive tread.
So....managed to get some Schwalbe CX on it, 30c! A little heavy but cheap at 15 a pop and seems grand for the job in hand!
There you go, definitely more aggressive than I was thinking.
@Jungledrummer13 started
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How knobby? Schwalbe Marathon iterations might work for you, or their Delta on the cheap end of things, but it doesn't have the most aggressive tread.