What is the tire pressure for 255 55R20?
R20 is a metric tire that comes in a standard load (sl) range and an extra load (xl) range. Standard load (sl) size has a load index of 107 with a maximum load capacity of 2149 lbs at 36 psi, capable of supporting up to 2149 pounds when inflated to its maximum air pressure of 36 pounds per square inch. When it comes to tire sizing, the initial number is the tire width in millimeters. Therefore, a 255 tire is 255 millimeters wide, and a 265 tire is 265 millimeters wide. That’s a 10mm difference in width.
Which tire is wider, a 245 or 255?
This number refers to the section width of the tire, measured in millimeters from sidewall to sidewall; thus, a 255 tire is 10mm wider than a 245 tire. You want to keep the overall rolling diameter the same as stock.