If you run on a loose outdoors track dusty , loamy try the AKA city blocks medium compound red foam inside , for me they work awesome , i also mix use medium in rear and hard in the front seems to work for me , or vise versa , of course this is my opinion , when the track is water look out tons of grip , you can try different set ups , i will try the aka gridirons , and prolines hole shots in the future , but i`m happy the way my truggy handles right now