I run whatever the packs will fit it lol. Pending on a few things I should be running mod buggy and 19t sedan next weekend in Enid. They are in the process of sealing the concrete with asphalt sealer and its looking promising. The onroad is 165 x 64 of useable space, and the offroad is pretty good size too. After we get used to the new surface, a few of us are really wanting to starting running mod sedan as well.