i have seen rubber stick as good as foam... and when it does it does not last very long... point being if you want to race at the top .. have the tire that will compete.. the rubber tire will go away faster than it will wear our, so if you are racing a rubber only class the guy who can replace his tires most often wins.. unless he sucks of course... and the guy who buys tires once a month will not have a prayer after a couple of races..... but on foam the tire works until the foam is gone... and at the small size if you rotate you donot need a truer to be competitive.....