There are a lot of patents, some first registered in the 60s, concerning retreading using a ring system. Most of the patents belong to Marangoni, the majority shareholder of Ellerbrock. But the new tyre manufacturers were also thinking about the idea of a ring. There were also developments by Goodyear very similar to the Marangoni system, so that it came to a legal settlement. But this was long ago and ancient history – now Goodyear offers its own ring called “Uni-Circle”. Until now only one plant has existed in Europe where these rings are produced: in the Marangoni factory in Frosinone (Italy) so you don’t need to be a detective to understand that the Goodyear source of Uni-Circle is the Marangoni plant. Now Ellerbrock has also begun production of the tread in form of a ring, also called Ringtread system. Ellerbrock will be responsible for the markets of Germany, Austria, Switzerland and Denmark. Other countries may be added later, because Ellerbrock will produce the modern tread patterns popular in central Europe. Capacity of the new facility will be 300 rings per day. One benefit of the rings in comparison with traditional flat tread patterns for retreading is the higher flexibility in production: charges of twenty rings are no problems in the new plant. But there are also benefits for the retreaders: they can save material, time, and because the process is totally automated, mistakes in production caused by human error – which might lead to splice separations – are nearly impossible. And the ring looks exactly like a new tyre. The target of Ellerbrock with the Ringtread system is not to change from traditional truck tyre retreading but to find new customers.