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The seat

A fundamental part of the chassis, often underestimated, is the seat and its supports which are important in reaching the required rigidity of the chassis.
The positioning of the seat is very important in that the driver has a total mass which amounts to about 40%, according to his weight and racing category.
Moving the seat influences the position of the frame’s barycentre and weight distribution.
The driver should become one with his seat and for this reason several sizes are made.
The driver’s arms should be free so that during a complete rotation in either direction, the elbows are extended, if not completely.
His legs must be positioned at a correct angle to avoid contracting the ankles into an unnatural position whilst releasing the pedals.
The materials, of varying rigidity and the shims, of varying height, used in the fabrication of the seats, enable adjustments to the torsion-rigidity of the frame.
The seats can be made of carbon or resin, the former being three times as rigid as the latter.
The more rigid the seat and its supports, the faster and more effectively it will work. It is important that the transfer of weight doesn’t happen too late or the kart will be exiting the bend.
Sometimes foam padding is used for the driver’s comfort without exaggerating however, in the quantity used.
Innovations aside, one can tell a go-kart is working well from the vibrations that it transmits to the body.

The weight distribution of the seat is important for the balance of the frame.

Example: 10 kg.

5-7 kg. On left side of seat
3 kg. On right side of seat (engine side)

If more weight needs to be added, it is advisable to place it under the seat at the front;
To gain greater traction it is advisable to place it on the back rest rather than in front of the seat.

Other very important elements are the extra fixing brackets between seat and chassis; these produce a greater force on the wheel, when fixed on axel cases, thus increasing lateral grip.