275/65R18
Common fitments: F-150, Silverado, Ram 1500
Overall diameter
32.07″
815 mm
Sidewall height
7.04″
178.8 mm
Tread width
275 mm
10.8″
Circumference
100.77″
8.4 ft
Revs per mile
629
391 per km
Wheel diameter
18″
aspect ratio 65%
Cross-section
- Overall diameter
- 32.07″
- Sidewall (each side)
- 7.04″
- Wheel
- 18″
275/65R18 compared with other sizes
All 35 practical swaps involving 275/65R18 — diameter change, speedometer impact and a fit verdict for each.
275/65R18 → 275/55R20
275/55R20
Diameter +0.5% · Good fit
275/65R18 → 265/75R16
265/75R16
Diameter +1.3% · Good fit
275/65R18 → 285/75R16
285/75R16
Diameter −2.3% · Good fit
275/65R18 → 235/80R17
235/80R17
Diameter +0.9% · Good fit
275/65R18 → 255/75R17
255/75R17
Diameter +0.0% · Good fit
275/65R18 → 275/70R17
275/70R17
Diameter −0.3% · Good fit
275/65R18 → 305/65R17
305/65R17
Diameter −1.6% · Good fit
275/65R18 → 305/70R17
305/70R17
Diameter −5.1% · Not recommended
275/65R18 → 245/65R18
245/65R18
Diameter +5.0% · Not recommended
275/65R18 → 255/65R18
255/65R18
Diameter +3.3% · Marginal fit — proceed with care
275/65R18 → 255/70R18
255/70R18
Diameter +0.1% · Good fit
275/65R18 → 265/65R18
265/65R18
Diameter +1.6% · Good fit
275/65R18 → 265/70R18
265/70R18
Diameter −1.6% · Good fit
275/65R18 → 275/60R18
275/60R18
Diameter +3.5% · Marginal fit — proceed with care
255/70R18 → 275/65R18
255/70R18
Diameter −0.1% · Good fit
305/60R18 → 275/65R18
305/60R18
Diameter +1.0% · Good fit
265/65R18 → 275/65R18
265/65R18
Diameter −1.6% · Good fit
285/65R18 → 275/65R18
285/65R18
Diameter +1.6% · Good fit
265/70R18 → 275/65R18
265/70R18
Diameter +1.7% · Good fit
285/60R18 → 275/65R18
285/60R18
Diameter −1.9% · Good fit
275/60R18 → 275/65R18
275/60R18
Diameter −3.4% · Marginal fit — proceed with care
275/70R18 → 275/65R18
275/70R18
Diameter +3.4% · Marginal fit — proceed with care
255/65R18 → 275/65R18
255/65R18
Diameter −3.2% · Marginal fit — proceed with care
275/70R17 → 275/65R18
275/70R17
Diameter +0.3% · Good fit
275/55R20 → 275/65R18
275/55R20
Diameter −0.5% · Good fit
245/65R18 → 275/65R18
245/65R18
Diameter −4.8% · Marginal fit — proceed with care
265/60R18 → 275/65R18
265/60R18
Diameter −4.8% · Marginal fit — proceed with care
255/75R17 → 275/65R18
255/75R17
Diameter −0.0% · Good fit
275/65R18 → 275/70R18
275/70R18
Diameter −3.3% · Marginal fit — proceed with care
275/65R18 → 285/60R18
285/60R18
Diameter +1.9% · Good fit
275/65R18 → 285/65R18
285/65R18
Diameter −1.6% · Good fit
275/65R18 → 285/70R18
285/70R18
Diameter −4.8% · Marginal fit — proceed with care
275/65R18 → 305/60R18
305/60R18
Diameter −1.0% · Good fit
275/65R18 → 305/50R20
305/50R20
Diameter +0.2% · Good fit
275/65R18 → 235/45R18
235/45R18
Diameter +21.8% · Not recommended
Common questions
- What is the overall diameter of a 275/65R18 tire?
- A 275/65R18 tire is about 32.07″ (815 mm) in overall diameter, with a sidewall height of 178.8 mm and a circumference of 100.77″.
- How many revolutions per mile does a 275/65R18 tire turn?
- A 275/65R18 turns roughly 629 revolutions per mile (391 per kilometre). This is the number that determines speedometer and odometer accuracy when you change tire size.
- What do the numbers in 275/65R18 mean?
- 275 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 275 × 65% = 178.8 mm tall.