Have you been on the manufacturers website, it might say on there?
Just out of interest, why do you want to know as well?
I've looked on Piper's website at the specification for the PA28 Warrior. It mentions 4 ply rating rubber for the nosewheel tyre: "Nose Wheel, 5.00 X 5 with Tube, 4 Ply Rating"
Is that such a thing/does that ring any bells?
I wanted to know because I'm a Physics A-level student and for my investigation I intend to look at the net force produced for a PA28 to reach its rotation speed. Before Christmas however, I need to do a pilot experiment. I'm doing coefficients of friction for different rubbers...hence the reason I need to know the rubber name!
Thanks