I think it might be helpful to hear what some different tire and wheel combos are producing as our new NASA Tire Section Width.   If you share the details on your widths I will update this post to consolidate and create a database. I understand it won't be perfect and it will be on the honor system, so consider that before dropping a bunch of coin.   Measured NASA Section Width - Tire Size - Tire Brand - Tire Model - psi - Date Code/Age - Wheel Size - Wheel Brand - Wheel Model - M