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Unread 06-29-2011, 08:57 AM   #11
The Last Moja Morani
 
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Default Re: Tire Pressure vs Speed

that is one of the most common tires you see on a stock cart......as long as you don,t start clocking people and pulling them over like our barney fife did lolol have fun with it....did you kid enjoy it?..............................
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Unread 06-29-2011, 08:28 PM   #12
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Default Re: Tire Pressure vs Speed

Anyone really want the physics of it? Much goes into the speed changes as psi changes. There is footprint size, shear force and other area related changes that alter the drag. There is also an elasticity effect related to the sidewall (basically the torque difference from the center of the wheel to the circumfrence) as the wheel is turned. What happens, in a nutshell, is that these all get worse (slower, or more power to turn the wheels) at lower psi. As the psi increases less tire is on the road, less friction or drag and the sidewall stiffens. Then you reach a point where adding more air ceases to change these properties any more, the rubber has expanded an hardened as far as it can (the nex step is a burst) so that's why it levels off. Try pushing the cart at lower ans higher pressures. You'll see the difference.

Last edited by Grinch; 06-29-2011 at 08:29 PM.. Reason: added some
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