We have previously covered clever sensors embedded in performance tyres capable of sending information about such parameters as pressure, temperature and even grip levels to the vehicle’s electronic safety systems in order to alter traction control, ABS and engine torque for optimum performance. This technology is still under development and therefore too expensive for mass production, but a similarly functional tyre chip can now be found in the new Michelin X Multi HD D truck tyre. This radio-frequency identification chip weighs just 0,2 g and is built into the tyre casing, where it cannot be removed or damaged. The chip is read by a scanning tool and carries a unique serial number linked to the history of the tyre, from cradle to grave. Measured tyre depths and the like can be linked to the serial number for traceability. If this information is combined with a tyre-pressure sensor, tyre life can be linked to pressure which is critical to minimising cost for fleet owners.