One of your responsibilities as a race engineer is to set tyre pressures for your race car. At first glance, this may seem straightforward, but as I found out, it’s a rabbit hole which is worth exploring. This article will cover everything one should know about tyre pressures including, the motivation behind setting tyre pressures, how to find the optimal pressure for your tyre, the pressure-temperature relationship of a tyre, calculating cold pressures to reach your desired target, and managing the uncertainties surrounding tyre pressures.