Flat Run/Run Flat technology
Flat Run tyre technology
How does Flat Run/Run Flat tyre technology work?
Nokian FRT (Flat Run Technology) is a special tyre construction for car tyres. It allows for driving a tyre with FRT even without tyre pressure. Some car manufacturers only use these kinds of tyres on their cars to ensure safe driving to the dealership after accidental damage.
Nokian FRT tyres have stronger construction than normal tyres. The sidewalls have a special component to provide extra stiffness to the sidewalls when driving on a flat tyre.
Nokian FRT tyres have an exceptionally strong structure. They have a special component on their side that increases the rigidity of the sidewall when driving on a flat tyre. At normal pressure, FRT tyres operate like normal tyres.
Driving on Nokian Flat Run/Run Flat tyres
You can drive approximately 50 kilometres on a flat tyre, if the car is fully loaded. If the car is only carrying the driver, the transition drive can be up to 150 kilometres.
Nokian Tyres recommends a maximum speed of 80 kilometres per hour. Under very slippery conditions, the speed should be kept at approximately 50 km/h.
For safety reasons, run flat tyres can only be mounted on cars equipped with air pressure monitoring that is integrated into the IT system, or some other system that warns of changes in tyre pressure changes, and a driving stability management system (ESP).
Repairing Flat Run/Run Flat tyres manufactured by Nokian Tyres
Tyres with this structure can be repaired in the tread area (such as in the case of nail punctures etc.) using adequate tubeless repair, if you are absolutely sure that the tyre has not been driven when clearly below the recommended pressure or when flat. You need to inspect the tyre closely from the inside and out to observe any traces of driving below the recommended pressure.
Driving for even a short distance when the tyre is flat may cause a rupture between the sidewall component and frame that cannot be visually observed.
With regard to the safety aspects, we do not recommend that suspect tyres be repaired at all; it is better to replace them.
This repair procedure covers tyres up to speed category H. We do not recommend that tyres in the higher speed categories (V / W / Y) be repaired at all.