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Pirelli P Zero
Pirelli Noise Cancelling System Image
MILAN, Italy (July 17, 2013) — Pirelli Tyre S.p.A. has developed tyres for Audi Group that are designed to reduce noise for occupants of the car using a layer of polyurethane sponge adhered to the inner liner of the tyre.

Pirelli claims the innovation—being pitched as "Pirelli Noise Cancelling System"—can reduce the noise heard by those inside the car by 2 to 3 decibels, or roughly half.

With this development, Pirelli is addressing noise caused by the vibration produced when air inside the tyre is compressed as the tyre is squashed against the road. This noise is transmitted from the tyre to the wheel hub and eventually reaches the inside of the car's cabin via the steering and suspension components.

The polyurethane foam sponge is designed to absorb these vibrations, the tyre maker said, and thus reduce the amount of noise passed through to the cabin.

Audi is offering tyres built with the noise-cancelling system as optional OE fitments on its RS6 and RS7, running on 285/30ZR21- and 275/30ZR21-sized tyres, respectively. Pirelli did not identify which tyre models are being supplied but said they are identified with letters "PNCS" on the sidewalls.

Pirelli did not say how much weight the sponge adds to the tyres but did say adding the noise-reducing sponge does not affect other performance characteristics of the tyre. Pirelli did not say whether the development affects noise as observed by those outside a vehicle, nor did it comment on what the added cost is.

The company said introducing this technology answers growing demand in the automotive world for reduced noise levels both on the inside and outside of the car as well as address the latest European regulations to reduce noise pollution.