The return of the axle diameter 40

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A technical choice that goes back to the past, but why?
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[dropcap]C[/dropcap]IK-FIA European KZ Champs, one of the top karting competitions, where the best drivers go down the track to contest the European title and the factories bring the most advanced material.

Certainly evolved, then why did we find a 40 mm diameter axle on the chassis of one of the contenders for the final victory (a measure used in the past, as explained in the dossier dedicated to the axles)?

Let’s recap: we are at Sarno, on the occasion of the first round valid for the European Championship of the KZ category, and under the Croc Promotion tent, after a careful check, we realize that Ben Hanley’s kart mounts an axle of 40 mm diameter or not the classic 50 mm.

The reason?
Improve the grip.
But not only: the 40 mm axle, in fact, releases the chassis set-up and therefore increases the smoothness during the exit.

All this must be supported by a complete setup of the chassis that supports this choice.

Decreasing diameter, in fact, can also lead to negative consequences, for example, lower braking stability (a thorough technical discussion on TKART Magazine).