Travis thanks for the answer. I did check the sidewalls and unfortunately the writing is worn away front and back. The rear tire says something about taking the pressure over 36psi to set the bead. I did not see any working pressure listed. I set them to 30psi. Not sure if that is good or bad. I set the front to 32psi cause I think I could see 32 on the warn off writing. It could have been the year is was made, smile. Whatever shipped on a T5C from the factory is still on there. The machine is prob 20+ years old. Does that help to get a guess?