It's no surprise really. Touring cars, 12th scale, micro's all use foams on carpet to great effect. I made up some foams for my CAT SX from 1/8th scale donuts by Enetti and they are bloody superb on carpet! Wear rates are very low and the cost of the wheels are cheaper than a set of Schumy's mounted. The foams I use is close to the same size as rubber tyres so no need for changed gearing either. All in all I don't know why they are not commercially available as I think they are great for indoor racing.
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