Check this out:

"While F1 teams are expected to line up by the droves to incorporate this new technology into their teams’ processes, their counterparts at NASCAR might have to wait a while. NASCAR tires have inner and outer carcasses, making the detection of the outer carcass temperature a more difficult proposition (according to BERU engineers)."

Mount the Sensor ON the car, not in the wheel.
MY HVAC guy has had one of these IR temp sensors years ago. Why is this just happening in racing ? Thought this was done ages ago.