As with all other tires, the air pressure in the inner twin tire has a direct influence on fuel consumption and tire wear: a reduced pressure of 0.2 bar leads to 1 percent more fuel consumption and reduces the service life of the tire by 10%.

At 0.4 bar under-inflation, fuel consumption increases by 2 percent and tire life is reduced by 30 percent.

0.6 bar under-inflation increases fuel consumption by as much as 4 percent, while the lifespan is reduced by 45 percent. This means that a truck that requires an average of 35 liters of diesel per 100 km and is operated with a tire pressure that is 0.5 bar below the recommended pressure, will consume 875 liters of fuel unnecessarily over a 100,000 km period. 

 With air-flexx®, workshop times can be reduced.  

A deviation of just 0.6 bar from the ideal air pressure can reduce a tire's lifespan by around 45 percent, meaning that in this case, the commercial vehicle will have to visit the garage almost twice as often just for tire changes than would actually be necessary.

If a low tire pressure causes an accident, the vehicle will be out of service for a longer period of time, resulting in additional repair costs.

With air-flexx®, fleets can save a lot of money.  

Every year, costs amounting to many millions of euros are incurred due to insufficient tire pressure.

Checking the air pressure of the inner tires is particularly unpopular with dual tires: it is time-consuming, dirty and tedious. That is why people often refrain from checking these tires. If the valve extensions are defective, checking is often not possible at all.

air-flexx® valve extensions pay for themselves after just a few thousand kilometers:

They make checking and adjusting the air pressure considerably easier.

Check air pressure – with the hubcap on  

Vehicles with dual tires

Checking the air pressure in the inner dual tires regularly is often not possible because plastic or hose valve extensions are either broken off or missing. The consequences are a greater risk of accidents and higher tire wear.

Disadvantages of plastic valve extensions

Plastic valve extensions are rigid and therefore break easily when foreign objects get between the twin tires or when the valve extension is not guided precisely through a rim hole when mounting the outer twin wheel. They quickly become brittle and fragile due to thermal influences. If the valve extension is broken, the pressure of the inner twin tire can no longer be checked!ahrzeuge mit Zwillingsbereifung

Disadvantages of rubber tube valve extensions

Rubber tube valve extensions can only be used with rim holders. If the valve extension comes loose from the rim holder, it will rub through the rim hole and the air pressure will completely escape from the tire. A flat tire in a few seconds and a puncture are inevitable.

The statistics prove it: flat tires on commercial vehicles repeatedly lead to serious accidents!

Collisions with broken-down vehicles or those that have spun out of control often have fatal consequences. By avoiding punctures, the number of these accidents can be significantly reduced.

Only around 15% of all flat tires are caused by sudden, serious tire damage resulting from external influences. The remaining 85% are preceded by a gradual loss of pressure, which, however, is usually not noticed by the driver, especially in the case of commercial vehicles, unless they regularly check the air pressure in all tires. Due to the increased flexing work, the “flaccid” tire heats up excessively and can reach temperatures of up to 130°C in the carcass area (the tire's substructure), which in the worst case can cause the tire to burst. Another cause of flat tires: damaged rubber tube valve extensions can cause a sudden pressure loss in the inner dual tire.