Never mind you answered the question with the gear scenario. The more surface area you have the more room you have to mesh with the tiny little bumps in the ground. Heheh btw I found this little tidbit about rubber tires which is interesting.
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Tires are actually their grippiest when there is about 5% slippage involved.
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If either a public officer or any one else saw a person attempting to cross a bridge which had been ascertained to be unsafe, and there were no time to warn him of his danger, they might seize him and turn him back without any real infringement of his liberty; for liberty consists in doing what one desires, and he does not desire to fall into the river. -Mill
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