An insertable skate outsole shim for increased attack angle is installable between the outsole heel of a skate and the rear post of a blade or wheel holder. The outsole shim raises the heel of the skater and postures the skater with weight forward decreasing dorsiflexion of the ankle and accommodating deeper knee bend. The outsole shim dampens vibrations and absorbs forces applied during skating. The outsole shim is producible at different sizes adapted for different skating performance. The outsole shim may be produced with an angled surface to correct for overpronation or oversupination.