What does the R in the 295 75R22 5 on the tire represent?
In this case, the sidewall height is 75% of 295 mm. R: This letter indicates the tire’s construction type. R’ stands for radial, which is the most common type for commercial truck tires. This is the diameter of the wheel rim in inches that the tire is designed to fit. Tire Width In the examples above (P225/60R16 95S and LT235/75R15 96H), the section widths are 225mm and 235mm, respectively. So, in general, the larger the number the wider the tire.The first number in these sizes is the tire’s overall diameter, or how big around it is when inflated (but not under load). In this case it’s 35 inches. The second number in the size, this represents the section width, or how wide the tire is from sidewall to sidewall.