Chris is right.
There are so many variables that it is difficult to know which ones are being affected at any particular time.
For example:
Track surface, track temperature and track design all affect tyre temperature.
Driving style (just look at the infra red heat effects on an F1 tyre) affects tyre temperature.
The kart design, age and fatigue and the way the rubber is presented to the track all affect tyre temperature.
In an F1 tyre the difference between good performance and poor performance in a tyre is as little as 1 psi (0.07 of a bar) yet the pressures on two cars of the same make may differ by more than that with both drivers getting the best measured performance that they can.
So how can one say that one particular make of rim will make everyone perform better?
Of course, if CelebrityDriver wins races on it, it must be right, won't it? Yet we all know various drivers could win regardless of what machinery they drove, so does it prove component X to be superior?
The only way to know is to get out on a track and measure it against your current setup, and be aware that whatever makes it faster could change with a different track, different weather or different tyre pressure or a change in the driving style.
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