255/40R19 Tire Size
Dimensions of a 255/40R19 tire in inches and millimeters, with equivalent and plus sizes.
255/40R19 dimensions
A 255/40R19 tire is 255 mm wide with a sidewall that is 40% of the width (102 mm), mounted on a 19-inch rim. Its overall diameter is about 27.03 inches (687 mm), so it is roughly a 27.0-inch tall tire.
| Overall diameter | 27.03 in | 687 mm |
|---|---|---|
| Section width | 10.04 in | 255 mm |
| Sidewall height | 4.02 in | 102.0 mm |
| Rim diameter | 19 in | 483 mm |
| Circumference | 84.9 in | 2157 mm |
| Revolutions | 746 per mile | 464 per km |
Equivalent sizes on a 19-inch rim
These sizes stay within ±3% of the 255/40R19 diameter on the same rim — the range most tire shops use. Not every size is made in every tire model, and only sizes approved for your vehicle (with the right load and speed rating) should be fitted.
| Size | Diameter | mm | Difference |
|---|---|---|---|
| 235/45R19 | 27.33 in | 694 mm | +1.1% |
| 245/40R19 | 26.72 in | 679 mm | -1.2% |
| 265/40R19 | 27.35 in | 695 mm | +1.2% |
| 275/35R19 | 26.58 in | 675 mm | -1.7% |
| 235/40R19 | 26.40 in | 671 mm | -2.3% |
| 275/40R19 | 27.66 in | 703 mm | +2.3% |
| 245/45R19 | 27.68 in | 703 mm | +2.4% |
| 265/35R19 | 26.30 in | 668 mm | -2.7% |
Plus and minus sizes
Changing the rim size? These options on 18-, 20- and 21-inch rims keep the overall diameter within ±3%.
| Size | Diameter | mm | Difference |
|---|---|---|---|
| 255/35R20 | 27.03 in | 686 mm | -0.0% |
| 255/45R18 | 27.04 in | 687 mm | +0.0% |
| 255/30R21 | 27.02 in | 686 mm | -0.0% |
| 285/40R18 | 26.98 in | 685 mm | -0.2% |
| 265/30R21 | 27.26 in | 692 mm | +0.8% |
| 245/30R21 | 26.79 in | 680 mm | -0.9% |
| 265/35R20 | 27.30 in | 694 mm | +1.0% |
| 245/35R20 | 26.75 in | 680 mm | -1.0% |
| 285/30R20 | 26.73 in | 679 mm | -1.1% |
| 245/45R18 | 26.68 in | 678 mm | -1.3% |
Compare 255/40R19 with another size →
Frequently asked questions
How tall is a 255/40R19 tire?
About 27.03 inches (687 mm) in overall diameter.
How wide is a 255/40R19 tire?
The section width is 255 mm, about 10.0 inches.
What size can replace 255/40R19?
On the same rim, 235/45R19 is the closest size (+1.1% diameter). Use only sizes approved for your vehicle.
How many revolutions per mile does a 255/40R19 tire make?
About 746 revolutions per mile (464 per km).
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