Examples and explanation of the main typologies of motorcycle tyre structures
Both known as conventional or cross-ply construction, this carcass is made of overlapping layers of fabric bands coated in rubber. The crossing angle of these layers, their number and the material they are made of may vary according to the different dynamic characteristics, speed and load specifications.
This type of structure consists of a conventional carcass surmounted by two or more crossed layers named bias-belt. The difference between carcass and belts is in the materials they are made of and their scope: the carcass has to mainly give the tyre its stiffness and load carrying capacity while the belt function, often made of an aramid fibre, is reduce the dynamic deformation caused by centrifugal forces.
Radial with bias belt
This type of structure consists of a radial carcass surmounted by a bias-belt.
The main difference from the bias-belted tyre is in the structure of the carcass that in this case is radial. This means that its cords are wrapped radially around the tyre, from one bead to the other. In this way low-section tyres can be realized, giving big advantages in terms of cornering stability, reduced weight and high-speed performance. It has extremely high rigidity allowing the possibility to tune the belt winding spacing to produce varying levels of stiffness from shoulder to crown.
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