255/40R19
A 255/40R19 tire is 27.03 inches tall and 10.0 inches wide, with a 4.02-inch sidewall, mounted on a 19-inch wheel.
Common fitments: Model Y, Highlander, CX-9
Overall diameter
27.03″
687 mm
Sidewall height
4.02″
102.0 mm
Tread width
255 mm
10.0″
Circumference
84.92″
7.1 ft
Revs per mile
746
464 per km
Wheel diameter
19″
aspect ratio 40%
Cross-section
- Overall diameter
- 27.03″
- Sidewall (each side)
- 4.02″
- Wheel
- 19″
255/40R19 in inches and millimeters
Every dimension of a 255/40R19, converted both ways. Calculated from the size code, accurate to about 1%.
| Measurement | Inches | Millimeters |
|---|---|---|
| Overall diameter (height) | 27.03″ | 687 mm |
| Tread width | 10.0″ | 255 mm |
| Sidewall height | 4.02″ | 102.0 mm |
| Wheel diameter | 19″ | 483 mm |
| Circumference | 84.92″ | 2157 mm |
Nominal dimensions from the size code. A real tire varies by a few millimeters between manufacturers, and a loaded tire sits slightly shorter than its free diameter.
255/40R19 compared with other sizes
All 31 practical swaps involving 255/40R19 — diameter change, speedometer impact and a fit verdict for each.
255/40R19 → 235/55R17
235/55R17
Diameter −0.5% · This fits
255/40R19 → 235/50R18
235/50R18
Diameter −0.8% · This fits
255/40R19 → 235/40R19
235/40R19
Diameter +2.4% · This fits
255/40R19 → 245/35R19
245/35R19
Diameter +5.0% · Borderline. Check clearance first
255/40R19 → 245/40R19
245/40R19
Diameter +1.2% · This fits
255/40R19 → 245/45R19
245/45R19
Diameter −2.3% · This fits
255/40R19 → 255/35R19
255/35R19
Diameter +3.9% · Borderline. Check clearance first
235/45R19 → 255/40R19
235/45R19
Diameter +1.1% · This fits
245/40R19 → 255/40R19
245/40R19
Diameter −1.2% · This fits
235/40R19 → 255/40R19
235/40R19
Diameter −2.3% · This fits
275/40R19 → 255/40R19
275/40R19
Diameter +2.3% · This fits
245/45R19 → 255/40R19
245/45R19
Diameter +2.4% · This fits
255/35R19 → 255/40R19
255/35R19
Diameter −3.7% · Borderline. Check clearance first
255/45R19 → 255/40R19
255/45R19
Diameter +3.7% · Borderline. Check clearance first
255/35R20 → 255/40R19
255/35R20
Diameter −0.0% · This fits
255/45R18 → 255/40R19
255/45R18
Diameter +0.0% · This fits
235/50R19 → 255/40R19
235/50R19
Diameter +4.5% · Borderline. Check clearance first
245/35R19 → 255/40R19
245/35R19
Diameter −4.7% · Borderline. Check clearance first
215/60R17 → 255/40R19
215/60R17
Diameter +0.5% · This fits
235/55R17 → 255/40R19
235/55R17
Diameter +0.5% · This fits
235/50R18 → 255/40R19
235/50R18
Diameter +0.8% · This fits
255/40R19 → 275/40R19
275/40R19
Diameter −2.3% · This fits
255/40R19 → 245/35R20
245/35R20
Diameter +1.0% · This fits
255/40R19 → 255/35R20
255/35R20
Diameter +0.0% · This fits
255/40R19 → 295/35R20
295/35R20
Diameter −3.9% · Borderline. Check clearance first
255/40R19 → 215/60R17
215/60R17
Diameter −0.5% · This fits
255/40R19 → 255/45R18
255/45R18
Diameter −0.0% · This fits
255/40R19 → 235/45R19
235/45R19
Diameter −1.1% · This fits
255/40R19 → 235/50R19
235/50R19
Diameter −4.3% · Borderline. Check clearance first
255/40R19 → 255/45R19
255/45R19
Diameter −3.6% · Borderline. Check clearance first
255/40R19 → 265/35R20
265/35R20
Diameter −1.0% · This fits
Common questions
- What is 255/40R19 in inches?
- A 255/40R19 tire is 27.03 inches tall and 10.0 inches wide, with a 4.02-inch sidewall, mounted on a 19-inch wheel. In metric that is 687 mm tall and 255 mm wide. The circumference is 84.92 inches.
- How tall is a 255/40R19 tire?
- 27.03 inches, or 687 mm. That is the overall diameter, wheel included. It turns about 746 times per mile, which is what your speedometer counts.
- What do the numbers in 255/40R19 mean?
- 255 is the tread width in millimeters, 40 is the aspect ratio — the sidewall height as a percentage of the tread width — and 19 is the wheel diameter in inches. So the sidewall is 255 × 40% = 102.0 mm tall.