255/45R19
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 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% · Marginal fit — proceed with care
255/45R19 → 245/45R19
245/45R19
Diameter +1.3% · Good fit
255/45R19 → 255/40R19
255/40R19
Diameter +3.7% · Marginal fit — proceed with care
255/45R19 → 275/40R19
275/40R19
Diameter +1.4% · Good fit
255/45R19 → 265/50R19
265/50R19
Diameter −4.7% · Marginal fit — proceed with care
255/45R19 → 295/35R20
295/35R20
Diameter −0.3% · Good fit
255/45R19 → 215/65R17
215/65R17
Diameter +0.1% · Good fit
255/45R19 → 225/60R17
225/60R17
Diameter +1.5% · Good fit
255/45R19 → 235/60R17
235/60R17
Diameter −0.2% · Good fit
255/45R19 → 235/55R18
235/55R18
Diameter −0.5% · Good fit
255/45R19 → 235/45R19
235/45R19
Diameter +2.6% · Good fit
255/45R19 → 235/50R19
235/50R19
Diameter −0.8% · Good fit
255/45R19 → 235/55R19
235/55R19
Diameter −3.9% · Marginal fit — proceed with care
255/45R19 → 245/55R19
245/55R19
Diameter −5.3% · Not recommended
235/50R19 → 255/45R19
235/50R19
Diameter +0.8% · Good fit
245/45R19 → 255/45R19
245/45R19
Diameter −1.3% · Good fit
275/40R19 → 255/45R19
275/40R19
Diameter −1.3% · Good fit
255/40R19 → 255/45R19
255/40R19
Diameter −3.6% · Marginal fit — proceed with care
255/50R19 → 255/45R19
255/50R19
Diameter +3.6% · Marginal fit — proceed with care
235/45R19 → 255/45R19
235/45R19
Diameter −2.5% · Good fit
235/55R19 → 255/45R19
235/55R19
Diameter +4.1% · Marginal fit — proceed with care
245/40R19 → 255/45R19
245/40R19
Diameter −4.7% · Marginal fit — proceed with care
265/50R19 → 255/45R19
265/50R19
Diameter +5.0% · Marginal fit — proceed with care
215/65R17 → 255/45R19
215/65R17
Diameter −0.1% · Good fit
235/60R17 → 255/45R19
235/60R17
Diameter +0.2% · Good fit
295/35R20 → 255/45R19
295/35R20
Diameter +0.3% · Good fit
235/55R18 → 255/45R19
235/55R18
Diameter +0.5% · Good fit
245/40R20 → 255/45R19
245/40R20
Diameter −1.1% · Good fit
255/45R19 → 255/50R19
255/50R19
Diameter −3.5% · Marginal fit — proceed with care
255/45R19 → 245/40R20
245/40R20
Diameter +1.2% · Good fit
255/45R19 → 275/35R20
275/35R20
Diameter +1.7% · Good fit
Common questions
- What is the overall diameter of a 255/45R19 tire?
- A 255/45R19 tire is about 28.04″ (712 mm) in overall diameter, with a sidewall height of 114.8 mm and a circumference of 88.08″.
- How many revolutions per mile does a 255/45R19 tire turn?
- A 255/45R19 turns roughly 719 revolutions per mile (447 per kilometre). This is the number that determines speedometer and odometer accuracy when you change tire size.
- What do the numbers in 255/45R19 mean?
- 255 is the tread width in millimetres, 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.