255/40R19
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 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% · Good fit
255/40R19 → 235/50R18
235/50R18
Diameter −0.8% · Good fit
255/40R19 → 235/40R19
235/40R19
Diameter +2.4% · Good fit
255/40R19 → 245/35R19
245/35R19
Diameter +5.0% · Marginal fit — proceed with care
255/40R19 → 245/40R19
245/40R19
Diameter +1.2% · Good fit
255/40R19 → 245/45R19
245/45R19
Diameter −2.3% · Good fit
255/40R19 → 255/35R19
255/35R19
Diameter +3.9% · Marginal fit — proceed with care
235/45R19 → 255/40R19
235/45R19
Diameter +1.1% · Good fit
245/40R19 → 255/40R19
245/40R19
Diameter −1.2% · Good fit
235/40R19 → 255/40R19
235/40R19
Diameter −2.3% · Good fit
275/40R19 → 255/40R19
275/40R19
Diameter +2.3% · Good fit
245/45R19 → 255/40R19
245/45R19
Diameter +2.4% · Good fit
255/35R19 → 255/40R19
255/35R19
Diameter −3.7% · Marginal fit — proceed with care
255/45R19 → 255/40R19
255/45R19
Diameter +3.7% · Marginal fit — proceed with care
255/35R20 → 255/40R19
255/35R20
Diameter −0.0% · Good fit
255/45R18 → 255/40R19
255/45R18
Diameter +0.0% · Good fit
235/50R19 → 255/40R19
235/50R19
Diameter +4.5% · Marginal fit — proceed with care
245/35R19 → 255/40R19
245/35R19
Diameter −4.7% · Marginal fit — proceed with care
215/60R17 → 255/40R19
215/60R17
Diameter +0.5% · Good fit
235/55R17 → 255/40R19
235/55R17
Diameter +0.5% · Good fit
235/50R18 → 255/40R19
235/50R18
Diameter +0.8% · Good fit
255/40R19 → 275/40R19
275/40R19
Diameter −2.3% · Good fit
255/40R19 → 245/35R20
245/35R20
Diameter +1.0% · Good fit
255/40R19 → 255/35R20
255/35R20
Diameter +0.0% · Good fit
255/40R19 → 295/35R20
295/35R20
Diameter −3.9% · Marginal fit — proceed with care
255/40R19 → 215/60R17
215/60R17
Diameter −0.5% · Good fit
255/40R19 → 255/45R18
255/45R18
Diameter −0.0% · Good fit
255/40R19 → 235/45R19
235/45R19
Diameter −1.1% · Good fit
255/40R19 → 235/50R19
235/50R19
Diameter −4.3% · Marginal fit — proceed with care
255/40R19 → 255/45R19
255/45R19
Diameter −3.6% · Marginal fit — proceed with care
255/40R19 → 265/35R20
265/35R20
Diameter −1.0% · Good fit
Common questions
- What is the overall diameter of a 255/40R19 tire?
- A 255/40R19 tire is about 27.03″ (687 mm) in overall diameter, with a sidewall height of 102.0 mm and a circumference of 84.92″.
- How many revolutions per mile does a 255/40R19 tire turn?
- A 255/40R19 turns roughly 746 revolutions per mile (464 per kilometre). This is the number that determines speedometer and odometer accuracy when you change tire size.
- What do the numbers in 255/40R19 mean?
- 255 is the tread width in millimetres, 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.