The 401R chassis is the continuation, spanning two decades, of Tony Kart’s flagship chassis. There are no wholesale changes with respect to the past: the OTK Group engineers have concentrated their efforts on refining every detail. However, there are still plenty of innovations, starting with the new front number plate fairing and the “hi-grip” steering wheel.
The frame of the new Tony Kart Racer 401R is unchanged with respect to the S version. Therefore, it is a chassis with a traditional shape, consisting of 30 mm diameter tubes welded by robots. Welding, an important phase in the construction of a chassis, is one of the strengths of OTK’s production, the group that owns the Tony Kart, Kosmic Kart, FA Kart, Exprit Kart and Redspeed brands: the expertise gained and the use of the latest generation automated welding machinery makes it possible to produce frames that are perfectly identical to one another, eliminating the variable represented by human error.
Compared to the previously approved chassis, the 401R introduces new seat supports. This area now features a block (sporting the OTK logo in relief) welded to the chassis, to which the seat bracket is fixed. This solution avoids having to fold the support plates, which in the past were welded of the chassis, preventing possible failures over time. Furthermore, the anomalous stresses created when attaching the seat have been eliminated, keeping the chassis neutral.
The floor panel has also undergone some improvements, in particular the fixing supports, now with a smaller section compared to the Racer 401S: a solution that allows the chassis to heat up less during welding and yet again underlines the attention to detail in OTK’s production operation. The floor panel itself has been raised by 7 mm to prevent the fixing nuts from touching the tarmac and wearing down. At their lowest point, the floor panel fixing screws are now at the same height as the chassis tubes. However, the most noticeable change concerns the size of the floor panel, whose surface has been significantly increased, reaching the ends of the chassis tubes and completely closing the front end. The advantages are in terms of aerodynamics and the optimisation of air flow at high speeds.
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