255/45R19
A 255/45R19 tire is 28.04 inches tall and 10.0 inches wide, with a 4.52-inch sidewall, mounted on a 19-inch wheel.
Overall diameter
28.04″
712 mm
Sidewall height
4.52″
114.8 mm
Tread width
255 mm
10.0″
Circumference
88.08″
7.3 ft
Revs per mile
719
447 per km
Wheel diameter
19″
aspect ratio 45%
Cross-section
- Overall diameter
- 28.04″
- Sidewall (each side)
- 4.52″
- Wheel
- 19″
255/45R19 in inches and millimeters
Every dimension of a 255/45R19, converted both ways. Calculated from the size code, accurate to about 1%.
| Measurement | Inches | Millimeters |
|---|---|---|
| Overall diameter (height) | 28.04″ | 712 mm |
| Tread width | 10.0″ | 255 mm |
| Sidewall height | 4.52″ | 114.8 mm |
| Wheel diameter | 19″ | 483 mm |
| Circumference | 88.08″ | 2237 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.
255/45R19 compared with other sizes
All 31 practical swaps involving 255/45R19 — diameter change, speedometer impact and a fit verdict for each.
255/45R19 → 245/40R19
245/40R19
Diameter +4.9% · Borderline. Check clearance first
255/45R19 → 245/45R19
245/45R19
Diameter +1.3% · This fits
255/45R19 → 255/40R19
255/40R19
Diameter +3.7% · Borderline. Check clearance first
255/45R19 → 275/40R19
275/40R19
Diameter +1.4% · This fits
255/45R19 → 265/50R19
265/50R19
Diameter −4.7% · Borderline. Check clearance first
255/45R19 → 295/35R20
295/35R20
Diameter −0.3% · This fits
255/45R19 → 215/65R17
215/65R17
Diameter +0.1% · This fits
255/45R19 → 225/60R17
225/60R17
Diameter +1.5% · This fits
255/45R19 → 235/60R17
235/60R17
Diameter −0.2% · This fits
255/45R19 → 235/55R18
235/55R18
Diameter −0.5% · This fits
255/45R19 → 235/45R19
235/45R19
Diameter +2.6% · This fits
255/45R19 → 235/50R19
235/50R19
Diameter −0.8% · This fits
255/45R19 → 235/55R19
235/55R19
Diameter −3.9% · Borderline. Check clearance first
255/45R19 → 245/55R19
245/55R19
Diameter −5.3% · Too big a jump
235/50R19 → 255/45R19
235/50R19
Diameter +0.8% · This fits
245/45R19 → 255/45R19
245/45R19
Diameter −1.3% · This fits
275/40R19 → 255/45R19
275/40R19
Diameter −1.3% · This fits
255/40R19 → 255/45R19
255/40R19
Diameter −3.6% · Borderline. Check clearance first
255/50R19 → 255/45R19
255/50R19
Diameter +3.6% · Borderline. Check clearance first
235/45R19 → 255/45R19
235/45R19
Diameter −2.5% · This fits
235/55R19 → 255/45R19
235/55R19
Diameter +4.1% · Borderline. Check clearance first
245/40R19 → 255/45R19
245/40R19
Diameter −4.7% · Borderline. Check clearance first
265/50R19 → 255/45R19
265/50R19
Diameter +5.0% · Borderline. Check clearance first
215/65R17 → 255/45R19
215/65R17
Diameter −0.1% · This fits
235/60R17 → 255/45R19
235/60R17
Diameter +0.2% · This fits
295/35R20 → 255/45R19
295/35R20
Diameter +0.3% · This fits
235/55R18 → 255/45R19
235/55R18
Diameter +0.5% · This fits
245/40R20 → 255/45R19
245/40R20
Diameter −1.1% · This fits
255/45R19 → 255/50R19
255/50R19
Diameter −3.5% · Borderline. Check clearance first
255/45R19 → 245/40R20
245/40R20
Diameter +1.2% · This fits
255/45R19 → 275/35R20
275/35R20
Diameter +1.7% · This fits
Common questions
- What is 255/45R19 in inches?
- A 255/45R19 tire is 28.04 inches tall and 10.0 inches wide, with a 4.52-inch sidewall, mounted on a 19-inch wheel. In metric that is 712 mm tall and 255 mm wide. The circumference is 88.08 inches.
- How tall is a 255/45R19 tire?
- 28.04 inches, or 712 mm. That is the overall diameter, wheel included. It turns about 719 times per mile, which is what your speedometer counts.
- What do the numbers in 255/45R19 mean?
- 255 is the tread width in millimeters, 45 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 × 45% = 114.8 mm tall.