Hi there, ran ST on grass at WCRCC, Cornwall, and found a good balance with Schumacher Blue Stagger Ribs, front, with the outside row cut/Dremeled off smooth, this takes away the aggressiveness of the tyre/compound and Proline Pyramids Z3 or Z4 on the rear, the harder compound on fresh grass.
If you can't get the Prolines, and there appears to be an issue with supply in the UK at present, would then suggest Schumacher Blue Mini Spikes on the rear, always a good tyre on damp grass tracks anywhere!
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