I like things I can understand. Some people think a kart chassis is simple but have little or no idea about how the thing works. At the other extreme we are led to believe that repositioning a tube by a few mm. or fitting an axle of marginally different 'hardness' will give the magic performance. As you say most of the components are standard or copied sowe are left with the frame. Now I would like to think that other than achieving a reasonable degree of structural integrity,the only significant variable is the torsional stiffness of the frame measured between front and rear 'axles'. How this
stiffness is achieved is irrelevant but once fixed by experience or observation, all that is needed is to match the other variables, caster, front offset , rear track, seat height etc to the chassis stiffness to get the required result. But.... you,and others in a completely different league to me assure me that there is much more to it than I suggest. I am not in a position to argue.I will carry on believing that a 50 mm axle is just that, hard soft. or medium, makes no difference a bit of wheel movement won't cure, and seeing no one seems to have the slightest idea how much ,or how, the thing deflects..... So to the original poster...vote out!
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