That's where a 21 with a knob comes in,gets down into it and the knobs bind it together,or somat.The older profiles like the 3.50 19 on my XS1 work well too,that's a big tyre,but the profile and stiff sidewalls allow it to work.
With my cars all those years ago I used skinny cross ply tyres,they got down to the road base and the stiff sidewalls swept the stones away.A radial has round shoulders and soft sidewalls,this allows the stones underneath and the tyre rides on top.Same applies to bikes.
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