255/65R18
Common fitments: Pilot, Highlander, Atlas
Overall diameter
31.05″
789 mm
Sidewall height
6.53″
165.8 mm
Tread width
255 mm
10.0″
Circumference
97.55″
8.1 ft
Revs per mile
650
404 per km
Wheel diameter
18″
aspect ratio 65%
Cross-section
- Overall diameter
- 31.05″
- Sidewall (each side)
- 6.53″
- Wheel
- 18″
255/65R18 compared with other sizes
All 37 practical swaps involving 255/65R18 — diameter change, speedometer impact and a fit verdict for each.
255/65R18 → 265/70R16
265/70R16
Diameter +1.5% · Good fit
255/65R18 → 265/60R18
265/60R18
Diameter +1.7% · Good fit
255/65R18 → 235/80R17
235/80R17
Diameter −2.4% · Good fit
255/65R18 → 245/75R17
245/75R17
Diameter −1.3% · Good fit
255/65R18 → 255/70R17
255/70R17
Diameter −0.0% · Good fit
255/65R18 → 275/65R17
275/65R17
Diameter −0.1% · Good fit
255/65R18 → 235/65R18
235/65R18
Diameter +3.4% · Marginal fit — proceed with care
255/65R18 → 245/60R18
245/60R18
Diameter +5.0% · Marginal fit — proceed with care
255/65R18 → 245/65R18
245/65R18
Diameter +1.7% · Good fit
255/65R18 → 255/60R18
255/60R18
Diameter +3.3% · Marginal fit — proceed with care
275/60R18 → 255/65R18
275/60R18
Diameter −0.2% · Good fit
285/60R18 → 255/65R18
285/60R18
Diameter +1.3% · Good fit
265/65R18 → 255/65R18
265/65R18
Diameter +1.6% · Good fit
245/65R18 → 255/65R18
245/65R18
Diameter −1.6% · Good fit
265/60R18 → 255/65R18
265/60R18
Diameter −1.7% · Good fit
255/70R18 → 255/65R18
255/70R18
Diameter +3.2% · Marginal fit — proceed with care
255/60R18 → 255/65R18
255/60R18
Diameter −3.2% · Marginal fit — proceed with care
275/65R18 → 255/65R18
275/65R18
Diameter +3.3% · Marginal fit — proceed with care
235/65R18 → 255/65R18
235/65R18
Diameter −3.3% · Marginal fit — proceed with care
255/70R17 → 255/65R18
255/70R17
Diameter +0.0% · Good fit
255/60R19 → 255/65R18
255/60R19
Diameter −0.0% · Good fit
255/55R20 → 255/65R18
255/55R20
Diameter −0.0% · Good fit
245/60R18 → 255/65R18
245/60R18
Diameter −4.8% · Marginal fit — proceed with care
285/65R18 → 255/65R18
285/65R18
Diameter +4.9% · Marginal fit — proceed with care
255/65R18 → 255/70R18
255/70R18
Diameter −3.1% · Marginal fit — proceed with care
255/65R18 → 265/65R18
265/65R18
Diameter −1.6% · Good fit
255/65R18 → 265/70R18
265/70R18
Diameter −4.8% · Marginal fit — proceed with care
255/65R18 → 275/60R18
275/60R18
Diameter +0.2% · Good fit
255/65R18 → 275/65R18
275/65R18
Diameter −3.2% · Marginal fit — proceed with care
255/65R18 → 285/60R18
285/60R18
Diameter −1.3% · Good fit
255/65R18 → 285/65R18
285/65R18
Diameter −4.7% · Marginal fit — proceed with care
255/65R18 → 255/60R19
255/60R19
Diameter +0.0% · Good fit
255/65R18 → 275/55R19
275/55R19
Diameter +0.5% · Good fit
255/65R18 → 255/55R20
255/55R20
Diameter +0.0% · Good fit
255/65R18 → 265/55R20
265/55R20
Diameter −1.4% · Good fit
255/65R18 → 285/50R20
285/50R20
Diameter −0.5% · Good fit
255/65R18 → 235/45R18
235/45R18
Diameter +17.9% · Not recommended
Common questions
- What is the overall diameter of a 255/65R18 tire?
- A 255/65R18 tire is about 31.05″ (789 mm) in overall diameter, with a sidewall height of 165.8 mm and a circumference of 97.55″.
- How many revolutions per mile does a 255/65R18 tire turn?
- A 255/65R18 turns roughly 650 revolutions per mile (404 per kilometre). This is the number that determines speedometer and odometer accuracy when you change tire size.
- What do the numbers in 255/65R18 mean?
- 255 is the tread width in millimetres, 65 is the aspect ratio — the sidewall height as a percentage of the tread width — and 18 is the wheel diameter in inches. So the sidewall is 255 × 65% = 165.8 mm tall.