I know they do it in cadet karts because the shorter wheelbase karts will tend to be faster on super tight tracks, and longer wheelbase is more stable on fast sweeping stuff. Maybe the same reason in senior karts. Its also entirely possible that it does nothing noticeable at all and its just a ploy to sell more karts…aka Marketing. :)
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Don't bother PMing me, it doesn't work. Email is best: tim@kartlift.com.