What does 225/75R16 mean?
225 |
The tire width is 225mm. |
75 |
The aspect ratio of the tire is 75. Aspect ratio is the relative height of tire sidewall. The number refers to the percentage of sidewall height in relation to tire width. |
R |
The letter in the middle refers to tire construction. Practically all tires sold for cars are radials.
Sometimes you also see tires with RF or ZR. RF indicates the tire is run flat, whereas ZR means the tire has speed rating higher than V. These tires are also radials, as the R indicates. |
16 |
Rim diameter for the tire. |
225/75R16 121R tire size
The width of 225/75R16 121R tire is stated in millimeters and sidewall height in percentages. In this table you’ll find out the 225/75R16 121R tire size in inches as well as few additional metrics:
|
In inches | In millimeters |
Section Width |
8.9″ | 225mm |
Sidewall height |
6.6″ | 169mm |
Diameter / Height |
29.3″ | 744mm |
Circumference |
92.0″ | 2337mm |
Rim Diameter |
16″ | |
Revolutions |
689 per mile | 428 per kilometer |
Rim Size for 225/75R16 121R Tires
Recommended rim sizes for 225/75R16 121R tire:
Diameter | Width Range |
16″ | 6-7″ |
What does C121 mean?
The load index 121 means that the tire has been designed to support 3197 lbs or 1450 kg.
The speed index R means that the tire has been designed to be used in speed up to 106 mph or 170 kph.
This size tire is usually used on light trucks and SUVs.