Can anyone explain these tire size markings? Wondering what the 51P and 62P signify. Also why is the front tire format different from the rear's width/profile/diameter. Front 3.00-21 51P Rear 120/80-18 62P
Maybe this page will help from Bridgestone. Number of plys, speed rating, and the number you mention, load index, etc. https://www.bridgestone.com/products/motorcycle_tires/products/option/index.html