the GRP tyre is good on grass and as said it keeps the grip levels better than yellows as the tyre wears. There might be a new compound out shortly on a par with sch green for wet weather.
BB greens are ok on grass but not as quick as sch yellow in the dry. They do work fairly well in the wet grass though. Pinks you wouldn't really use much unless the track is very bare and dusty.
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