You can fit one two three or four seat stays.
Fitting one seat stay each side is a weight transfer device helping to lift and unweight the inside rear wheel whilst pushing down on the outside wheel and can be very significant at certain tracks in controlling grip levels.
Additional seat stays will have an affect on your handling and also need to be fitted before any assessment is made as to the chassis balance.
Once you fit more than one seat stay this will actually starts to also stiffen up the chassis across the rear end, working more like the rear removable torsion bar.
In general, as you add more additional stays the back of the kart will remain flatter through the corners.
Your stopwatch is the instrument that will tell you whether you are heading in the right direction.
Sometimes you can find that the rule book is totally wrong, which is why you should try totally different things on a test day and document your findings relative to weather etc.
You don't need them if you drive a soapbox with pram wheels on it, do you Dave? Just don't let the steering rope get too frayed.
HOWEVER, if you have a technical piece of kit made by TonyKart, then yes, they do have a very significant influence on the chassis handling.
Or PERHAPS I'm just psychobabbling like Dave. :)
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