PDA is the remarkable indoor clay track in Bicester, Oxfordshire, this is possibly one of the few UK venues where you will use proline holeshots, you may find proline step pins used on some tracks but mostly as PTRU said its shui mini pins indoors on carpet/polished wood and mini spikes (yellow mostly in the dry, greens if damp) outside on grass or astroturf, sometimes pins are cut off tires to suit conditions/tracks and cut down on grip. There may be some magic used with soft/firm inserts. Ask around at trackside to see what the regular drivers use.
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