325/60R20 Tire Size
325/60R20 diameter, sidewall, revolutions per mile, and plus-sizing options.
The 325/60R20 tire size breaks down as: 325 mm section width, 60% aspect ratio, and a 20-inch rim. Below are its real, calculated dimensions.
325/60R20 Calculated Dimensions
| Metric | Value |
|---|---|
| Overall diameter | 35.4 in (898 mm) |
| Sidewall height | 7.7 in (195 mm) |
| Circumference | 111.1 in (2821 mm) |
| Revolutions per mile | 570 |
Typical Fitment
325/60R20 is most often found on heavy-duty pickups. Always confirm against the door-jamb placard or owner manual before fitting.
Plus-Sizing Alternatives
These sizes keep the overall diameter close to 325/60R20, so speedometer and gearing stay near stock:
| Size | Diameter | Diameter change |
|---|---|---|
| 335/60R20 | 35.83 in | +1.3% |
| 335/55R21 | 35.51 in | +0.4% |
| 345/50R22 | 35.58 in | +0.6% |
Speedometer Note
If you fit a 335/60R20 instead of 325/60R20, the diameter changes by +1.3%. A taller tire makes your speedometer read low — at a true 60 mph it would show roughly 59 mph. A shorter tire has the opposite effect, so the gauge reads high.
Use the tire calculator to compare 325/60R20 against any other size and see the exact diameter and speedometer difference.
Frequently Asked Questions
What does 325/60R20 mean?
325/60R20 means a 325 mm wide tire with a 60% sidewall aspect ratio mounted on a 20-inch rim. The aspect ratio is the sidewall height as a percentage of the width.
Can I plus-size from 325/60R20?
Yes, as long as the replacement keeps the overall diameter close to stock so the speedometer stays accurate. Common plus-size moves from 325/60R20 are 335/60R20, 335/55R21, 345/50R22.
Will 325/60R20 affect my speedometer?
Only if it differs in diameter from your original size. A taller tire reads low; a shorter tire reads high. Compare the two sizes with the calculator to find the percentage.