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Flat Run Tire Technology
Flat Run Tire Technology
How does Flat Run/Run Flat Tire Technology work?
Nokian FRT (Flat Run Technology) is a special construction for car tires, which allows driving on them even without pressure in the event of a flat tire. Some car manufacturers use these kinds of tires on their cars, but generally only to ensure safe driving to the dealership after accidental damage.
Nokian FRT tires have stronger construction than normal tires. The sidewalls have a special component to provide extra stiffness to the sidewalls when driving without pressure.
Nokian FRT tires 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 tire. At normal pressure, FRT tires operate like normal tires.
Driving on Nokian Flat Run/Run Flat tires
With Nokian’s FRT tires, you can drive approximately 30 miles (50 kilometres) with a flat, if the car is fully loaded. If the car is only carrying the driver, the transition drive can be up to 90 miles (150 kilometres).
Nokian Tyres recommends a maximum speed of 50 miles per hour (80 km/h). Under very slippery conditions, the speed should be kept at approximately 30 mph (50 km/h).
For safety reasons, run flat tires 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 tire pressure changes) and a driving stability management system (ESP).
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Repairing Flat Run/Run Flat tires manufactured by Nokian Tyres
Tires 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 tire has not been driven when clearly below the recommended pressure or when flat. You need to inspect the tire closely from the inside and out to observe any traces of driving below the recommended pressure.
Driving for even a short distance when the tire 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 tires be repaired at all; it is better to replace them.
This repair procedure covers tires up to speed category H. We do not recommend that tires in the higher speed categories (V / W / Y) be repaired at all.
