Share

Articles

10/05/2021
Guide to damage analysis

Professional School Federpneus

 

Sometimes, serving the customer means, for the tire dealer, also being able to recognize and explain the reasons why a tire has been damaged keeping in mind the boundary between a repairable tire and an end-of-life tire

Federpneus

Sometimes, serving the customer means, for the tire dealer, also being able to recognize and explain the reasons why a tire has been damaged keeping in mind the boundary between a repairable tire and an end-of-life tire. In collaboration with the Federpneus Technical Commission, we analyse and comment on a series of cases that customers have presented at different point of sale.

 

 

Damage from driving with under-inflated tires

These two pictures show the damage caused on the bead by running with insufficient pressure: the strong deformation of the sidewall has led the wheel disc to cause the detachment of the bead, damaging the tire.
Also by observing the sidewall, it is possible to recognize the damage produced by running with insufficient pressure.
In this image, we can see two different signs of use with insufficient pressure inside the tire: the dust accumulated and the blue colour of the rubber. Both phenomena are due to the high temperatures that develop as a result of excessive deformation inside the tire.

 

 

 

Short radius steering damage under full load conditions

These two pictures show a damaged shoulder typically found on semi-trailers manoeuvring under full load with a small turning radius. In these conditions, in fact, the tire undergoes a strong torsion along the vertical axis due to the load, which in time leads to the detachment of the tread near the shoulder. To avoid this type of damage, which is clearly impossible to repair, it is a good idea to try to manoeuvre as widely as possible.

 

 

 

Sidewall damage

Tire sidewall damage (in this case caused by an impact with a forklift) is never repairable, so when a tire has this type of damage it is always considered beyond repair.

 

 

 

Punctures

In case of punctures, the first thing to check, in order to evaluate whether the tire can be repaired, is the position of the hole in relation to the centre of the tread. In these two cases, the object penetrated the belt system beyond the limits indicated in the repair table, that is, near the shoulder.

Therefore, the tire should be declared beyond repair.

ÈIt is likewise important to check from the inside the position of the damage. In these two cases, it is clear from the internal inspection that the object perforated the tire outside the belt system, therefore, also in this case the tire cannot be repaired.

With a detailed inspection of the damage it is possible to open the belt system from the outside using a cutter to assess the damage caused.

 - Archive

back to list