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Automobile tyres are inflated to about 3...

Automobile tyres are inflated to about 30 `("pound")/("inch"^2)((lb)/("in"^2))` whereas bicycle tyres are inflated to 90 to `115(lb)/(I n^2), at leastthree times as much pressure ! Why?

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Bicycle tyres have a much smaller contact area with ground so they need a high pressure to balance the weight of the bicycle and the rider.
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