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I think that the problem is that wind at highway speeds is as strong or stronger than the force it would take for the bristles to bend for the tire. This means that anything that isn't supposed to rub really hard on the tire will start to bend at 70+MPH. I think staying with the broom bristles is the best bet, I mean that they might be the most immune to bending at speed, since the air can go around them. A solid piece of material will have a relatively large area, so once it starts to flap or bend in the wind it's toast.
This idea is OK for buses and city trucks that don't exceed 45MPH.
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is where you're going, not how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread
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