To Keep Maximum speed with Maxxis pinks on 90 % of the tracks that make decent grip you can only run them 2 to 3 races, flip them on the rim and repeat keep them for lower grip tracks buy new set, once the shoulder wears ( rounds off they loose speed ) so yes you would just be wasting your time and prep. There are a few tracks around you can get by with a more cured Re-rolled BUT even then the shoulder of the tire cannot be to worn away.