What is the tire pressure for 225 45 R18?
R18 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 91 with a maximum load capacity of 1356 lbs at 36 psi, capable of supporting up to 1356 pounds when inflated to its maximum air pressure of 36 pounds per square inch. The average overall diameter of a 225/45r18 tire is 25. So that makes for roughly 802 revolutions per mile. The 215/55r17 will have an average diameter of 26. A slight difference that may only cause your speedometer to be off by 1-2 mph.
What does 225 45 R18 mean?
In this case, the tire is 225 millimeters wide. This number represents the aspect ratio of the tire, which is the height of the tire’s sidewall as a percentage of its width. In this case, the sidewall height is 45% of the tire’s width. R: This letter indicates the tire’s construction type. Aspect Ratio (55, 45) In our examples, 55 and 45 indicate that the tire’s sidewall height is 55% and 45% of the tire’s width, respectively. A lower aspect ratio typically indicates a shorter sidewall and a wider tread, which can contribute to improved handling and responsiveness.