I don't know but driving and taking note of how the car drives and how the tires wear is the best. It's a new car platform from the game so I don't think there is a definitive answer.
In my experience the tires are more sensitive than on the GT3s, which probably makes sense since the tires are smaller than on a GT3 car. When the tyre degradation really hits it is quite noticeable. However as long as you don't drift and slide too much the wear shouldn't be an issue for a CP race. Just do some testing to find the optimal pressures and you will be fine. There is probably a higher risk of being mauled from behind by a GT3 than losing out because of the tyre wear