Comment on temperature.
I have previously posted about the problem with IR temp sensors but will repeat.
1. Sensors average the surface temperature over a 1/2" to 1" diameter circle.
2. Actual surface temperatures can vary by 30° to 50° over distances as small as 0.03" when measured with real good IR data cameras.
3. Rubber is a good insulator so it doesn't allow heat to spread out uniformly in a tire.
4. Tire surface temps can be 40° to 70° cooler than internal temps at critical locations.
5. Surface temps can cool down more than 30° in as little as a couple of minutes so unless you can measure all your tires in under minute you are not getting the correct readings.
6. If you insist on using the IR sensors do you always measure after running at least 4 to 10 miles at the same speed befor stopping and getting temps at the same time from when you cut speed +/- a minute?
7. Do you always measure the same spot on the tire? not 1" awar but your target is the same dia and centered at the same spot with the instrument at the same angle every time?
The above comes from personal experience in lab and working as tire tech with Indy race teams where we used needle probes to get accurate temp readings at the cord/rubber interface. Three readings per tire all four tires in one minute was our goal and we would meet it most of the time.
Hand held IR are ok for metals or very uniform objects but I would not trust any reading +/- 30° of a tire tread surface. It's really just a gadget that is not much different than a toy unless you spent $200 to $500 for it and you have it calibrated at least once a year.
Tires do not fail from the average temperature of the tire but from the cumulative effects of high heat in locations as small as 0.05" for failure initiation. Temperature variation in a single tire can easily be 100° so you are folloing yourself to think you are addressing the root cause of the heat degridation of the tires.
