Check it:
http://ecomodder.com/forum/showthrea...yle-29223.html
There are other solutions too that may smooth your wheels without looking too dodgy. There's "poor man's fiberglass," T-shirt material stretched tight and then painted to make it hold its shape (multiple coats may be necessary), which brings the added bonus that you can choose the color. I think you could get similar results using Tyvek.
Redneck pointed out that his plastic smoothies eventually broke down under constant sunlight, you might fare better by choosing some tougher plastic than garbage bags. Maybe lawn-and-garden bags?