about foams I do not know anything about molded foams for 1/10 but if I have to run proline tires I never run there foam it falls apart in a couple of runs just buy trinity bomb1 or stock losi foam it holds up alot longer and if there is any other tire that you can find that will work there try it I have never had a proline tire that will last very long panther or losi tires seem to hold up alot better