275/60R18
Overall diameter
30.99″
787 mm
Sidewall height
6.50″
165.0 mm
Tread width
275 mm
10.8″
Circumference
97.36″
8.1 ft
Revs per mile
651
404 per km
Wheel diameter
18″
aspect ratio 60%
Cross-section
- Overall diameter
- 30.99″
- Sidewall (each side)
- 6.50″
- Wheel
- 18″
275/60R18 compared with other sizes
All 34 practical swaps involving 275/60R18 — diameter change, speedometer impact and a fit verdict for each.
275/60R18 → 265/70R16
265/70R16
Diameter +1.3% · Good fit
275/60R18 → 265/60R18
265/60R18
Diameter +1.5% · Good fit
275/60R18 → 255/70R17
255/70R17
Diameter −0.2% · Good fit
275/60R18 → 275/65R17
275/65R17
Diameter −0.3% · Good fit
275/60R18 → 235/65R18
235/65R18
Diameter +3.2% · Marginal fit — proceed with care
275/60R18 → 245/60R18
245/60R18
Diameter +4.8% · Marginal fit — proceed with care
275/60R18 → 245/65R18
245/65R18
Diameter +1.5% · Good fit
275/60R18 → 255/60R18
255/60R18
Diameter +3.1% · Marginal fit — proceed with care
275/60R18 → 255/65R18
255/65R18
Diameter −0.2% · Good fit
275/60R18 → 255/70R18
255/70R18
Diameter −3.3% · Marginal fit — proceed with care
275/60R18 → 265/65R18
265/65R18
Diameter −1.8% · Good fit
275/60R18 → 265/70R18
265/70R18
Diameter −5.0% · Marginal fit — proceed with care
255/65R18 → 275/60R18
255/65R18
Diameter +0.2% · Good fit
245/65R18 → 275/60R18
245/65R18
Diameter −1.5% · Good fit
265/60R18 → 275/60R18
265/60R18
Diameter −1.5% · Good fit
285/60R18 → 275/60R18
285/60R18
Diameter +1.5% · Good fit
265/65R18 → 275/60R18
265/65R18
Diameter +1.8% · Good fit
275/65R18 → 275/60R18
275/65R18
Diameter +3.5% · Marginal fit — proceed with care
255/60R18 → 275/60R18
255/60R18
Diameter −3.0% · Marginal fit — proceed with care
235/65R18 → 275/60R18
235/65R18
Diameter −3.1% · Marginal fit — proceed with care
255/70R18 → 275/60R18
255/70R18
Diameter +3.4% · Marginal fit — proceed with care
275/65R17 → 275/60R18
275/65R17
Diameter +0.3% · Good fit
275/55R19 → 275/60R18
275/55R19
Diameter −0.3% · Good fit
305/60R18 → 275/60R18
305/60R18
Diameter +4.6% · Marginal fit — proceed with care
245/60R18 → 275/60R18
245/60R18
Diameter −4.6% · Marginal fit — proceed with care
285/65R18 → 275/60R18
285/65R18
Diameter +5.1% · Not recommended
275/60R18 → 275/65R18
275/65R18
Diameter −3.4% · Marginal fit — proceed with care
275/60R18 → 285/60R18
285/60R18
Diameter −1.5% · Good fit
275/60R18 → 285/65R18
285/65R18
Diameter −4.9% · Marginal fit — proceed with care
275/60R18 → 305/60R18
305/60R18
Diameter −4.4% · Marginal fit — proceed with care
275/60R18 → 255/60R19
255/60R19
Diameter −0.2% · Good fit
275/60R18 → 275/55R19
275/55R19
Diameter +0.3% · Good fit
275/60R18 → 255/55R20
255/55R20
Diameter −0.2% · Good fit
275/60R18 → 235/45R18
235/45R18
Diameter +17.7% · Not recommended
Common questions
- What is the overall diameter of a 275/60R18 tire?
- A 275/60R18 tire is about 30.99″ (787 mm) in overall diameter, with a sidewall height of 165.0 mm and a circumference of 97.36″.
- How many revolutions per mile does a 275/60R18 tire turn?
- A 275/60R18 turns roughly 651 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 275/60R18 mean?
- 275 is the tread width in millimetres, 60 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 × 60% = 165.0 mm tall.