245/55R19 Tire Size
245/55R19 diameter, sidewall, revolutions per mile, and plus-sizing options.
The 245/55R19 tire size breaks down as: 245 mm section width, 55% aspect ratio, and a 19-inch rim. Below are its real, calculated dimensions.
245/55R19 Calculated Dimensions
| Metric | Value |
|---|---|
| Overall diameter | 29.6 in (752 mm) |
| Sidewall height | 5.3 in (135 mm) |
| Circumference | 93.0 in (2363 mm) |
| Revolutions per mile | 681 |
Typical Fitment
245/55R19 is most often found on midsize SUVs. Always confirm against the door-jamb placard or owner manual before fitting.
Plus-Sizing Alternatives
These sizes keep the overall diameter close to 245/55R19, so speedometer and gearing stay near stock:
| Size | Diameter | Diameter change |
|---|---|---|
| 255/55R19 | 30.04 in | +1.5% |
| 255/50R20 | 30.04 in | +1.4% |
| 265/40R21 | 29.35 in | -0.9% |
Speedometer Note
If you fit a 255/55R19 instead of 245/55R19, the diameter changes by +1.5%. 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 245/55R19 against any other size and see the exact diameter and speedometer difference.
Frequently Asked Questions
What does 245/55R19 mean?
245/55R19 means a 245 mm wide tire with a 55% sidewall aspect ratio mounted on a 19-inch rim. The aspect ratio is the sidewall height as a percentage of the width.
Can I plus-size from 245/55R19?
Yes, as long as the replacement keeps the overall diameter close to stock so the speedometer stays accurate. Common plus-size moves from 245/55R19 are 255/55R19, 255/50R20, 265/40R21.
Will 245/55R19 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.