that car need 1/8 foam tires like "ofna foam tire" ........ the weigh of that foams is only 90gr each tyre+wheel .....
I used many times that foams in "experiments" and if you use a hard compound have a very long life ......
http://www.youtube.com/watch?v=uqPWNlZ5cgQ
SWORKZ BE-1, LEOPARD, HOBBYWING, GENS ACE, SANWA VX, FUTABA 3PL, MBX5R/T, RB5SPSL, FG MONSTER, TC5R, 808E, HYPER8, TF5, ZX5, NANO-TECH, HYPERION, 620DMG, ECO6-10, TEAM-IHOBBIES