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Balloons can work well if you use them correctly. Rubber bands can also work. We used some kind of liquid (i forgot the name) and rubbed it across our wheels every other week. You can probably find something like that. Sandpaper maybe?

thanks for all the help everyone. states tomorrow cant wait. we have also improved are car with the invention of new batteries it goes about 3-3.5 seconds on 10 meters and still under 10 cm off.

Can somebody give me a score that will probably get a medal at states. Right now we are at around 5 seconds for ten meters and about 12 centimeters or less off. 6 meters is about 2.5 seconds and 8 or less cm off