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Si 69® improved rolling resistance by about 25 %, and fuel consumption fell by about 5 %. In all key characteristics, this new generation of tires has a significantly better level of performance.
A successor, the mercaptosilane Si 363®, is already introduced to the market. Compared to the established silica-silane systems with Si 69®, the rolling resistance of the rubber compound with Si 363® is reduced by over 10 %. Thirteen percent lower values have already been measured on an actual tire. When compared to tires without silica/silane, rolling resistance drops by about 38%. Fuel consumption falls by 3 to 8%, depending on the basis of comparison.
A valuable advantage, especially if one considers that the new EU regulations starting in 2012 will limit and label the rolling resistance of all existing tires.