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A timing belt in power transmission and conveying systems cooperates with several elements consisting of timing pulleys, tensioners or guiding rails. Expectations concering coeficient of friction according to application. They depend strongly on characteristics of the process as well as the type of friction. In recent constructions, producers of timing belts are very much concerned about achieving as much slippery surface as possible. The work describes the problem of friction on different surfaces as well as its influence on gear lifetime. Research results confirm that on many surfaces bigger coefficient of friction is expected.