I've only every had Koxx Greens! they were good on a light grind. wud be better on a harsher grind. Recommended Use Brown: Medium grind, dry or wet weather, with or without tar. Great wear life. Red/Yellow: Medium or light grind, dry weather, with or without tar. Blue/Green: Medium or light grind, wet weather, without tar Go for the medium grind. If its too harsh, use browns for a week or so. to deaden the gringd off and wack the yellows back in.