I've run an old (supercharged) mini on Yoko A032R's in the rain - beat the pants off any other tyre that had ever been on it in wet conditions. Unbeleivable for a 165 wide tyre!
If it is grip you are after, you may need to compromise your wheels to suit the tyres that are available. Bigger wheels ain't always better in any case. You'll generally find the R-rated hoops aren't available in really low profile fitments.
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