I'm switching over tires today from the RC4WD Goodyear Duratrac tires to the Axial Trepadors along with the Injora foams. Had to do a little trimming again to get them to fit.
Note: At roughly the 13 minute mark I inserted a second blue foam into what would be the rear tire on the back. I went back after the video and corrected the mistake to put the red foam in the back tire.