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The axles

The axel must be a single piece made of any magnetic material, it cannot have any type of join or hinge or addition of any material which would modify or alter the concept of single piece. It can have a maximum diameter of 50mm, the mounting of a hardening bush of non magnetic material measuring a maximum of 12mm is allowed on the side of the ring gear. Also allowed is a perforated bush measuring between 30/60mm mounted inside the axel near the rear hubs, it can be made of magnetic or non magnetic material with the exception of carbon.
The rigidity of the rear axel is very important as a function in its own right but should also be considered in relation to the frame as this determines its rigidity. Most frames have three bearings, two of which are placed on the side of the ring gear to make the right side more rigid. In order to soften the frame and make it more free at the rear, one can free the internal bearing.
Tests carried out on the track and continuous research to improve our products has brought us to develop new rear axels.

Type A = Soft axel. Optimum performance, one must note however, that being soft makes it susceptible to bending in case of accident.
Particularly suited to conditions of much rubber on track.

Standard type B = Medium axel. This is the standard axel normally mounted on all frames.
Particularly suited to conditions of little rubber on track.

Type C = Rigid axel. More rigid than the standard type but very flexible and elastic.
Particularly adapted to high temperature conditions and much rubber on track.

Type D = Extra rigid axel. Harder and more rigid than type C, advisable when more adherence is needed at rear of kart.