Indoor testing of tires Nokian Tyres’ indoor testing makes sure that its new rubber mixtures, tread patterns and tire constructions are of high quality and are friendly to the environment. Moreover, with the indoor testing, we make sure that the tires conform to norms and requirements worldwide. Materials testing machines are used to test the structural toughness and high-speed durability of tires. Repetitive tests are used for monitoring the flawlessness of tires and for making sure products are of high quality and technically reliable. Obtaining certifications from the authorities and E-certificates requires separate tests which prove that products fulfil the requirements placed on them.