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Originally Posted by dtype38
In the case of a kart, there are no springs and the tyres compress and chassis flex due to cornering loads. You might be interested that I watched a programme about kart racing once where one of the top drivers was complaining that he'd chosen too stiff a chassis for the bumpy track he was racing at. He said he couldn't tune it in fully using the tyre pressures and track width and was losing time because he was bouncing too much over the bumps. From that I would guess that for karts tyre pressure and track width are used to adjust the effective "springing" for rough and smooth tracks, but that this only works within the limits of the chassis you have. :-)
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With karting the chassis is tuned to go around the corners as quickly as possible usually. I've not, at any circuit ever, had to alter my track/tyre presures to cope with bumps. With a kart the rule is generally front wheels out, more front end grip. However this is due to the lifting the rear's and cannot be applied to vehicles with diffs.