The current method is probably cheapest for the majority, as racers can use their tires elsewhere, and generally the tires that work are readily available to everyone.
Regarding foams, I'm pretty sure it would soon become expensive. You would soon find that as they wear they become better, so you'll start truing new tires down to the optimum diameter, which will then wear down past the optimum and you'll need a new set next week.
You've got the possibility of chunking tires and ruining a set in a matter of minutes, never mind meetings. And the addative thing can't be controlled by Ifmar at a worlds meeting, so how do you expect a club run by very few volunteers with no real scrutineering to manage it? And someone will try it because we're all competitive at heart, and it will provide an advantage.
Finally they make a shed load of mess from what I've seen!
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Yokomo - LMR
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