**4. Discussion**

The test sessions successfully returned the expected theoretical results obtained by studying the "flexible ring tire model". Starting from the laboratory, the tests focused on the relationship between the output from the sensors and features of interest. Most of the job focused on the flex-sensor, and as a consequence, it has been possible to anticipate what could be discovered in road tests, whereas the PVDF-sensor played the role of controlling the truthfulness of the flex-sensor readings. So, on one hand the prototype has been tested and controlled on its use, on the other hand it has gradually been miniaturized in order to not interfere significantly with the tire motion. The system energy requirement was lowered, by working on the firmware, by 33.4%. Furthermore, improvements were obtained by finding the best compromise between economy, energy consumption and performance of the wireless communication system.
