285/60R18
Overall diameter
31.46″
799 mm
Sidewall height
6.73″
171.0 mm
Tread width
285 mm
11.2″
Circumference
98.85″
8.2 ft
Revs per mile
641
398 per km
Wheel diameter
18″
aspect ratio 60%
Cross-section
- Overall diameter
- 31.46″
- Sidewall (each side)
- 6.73″
- Wheel
- 18″
285/60R18 compared with other sizes
All 34 practical swaps involving 285/60R18 — diameter change, speedometer impact and a fit verdict for each.
285/60R18 → 265/70R17
265/70R17
Diameter −0.4% · Good fit
285/60R18 → 265/60R18
265/60R18
Diameter +3.1% · Marginal fit — proceed with care
285/60R18 → 265/75R16
265/75R16
Diameter −0.6% · Good fit
285/60R18 → 285/75R16
285/75R16
Diameter −4.2% · Marginal fit — proceed with care
285/60R18 → 245/75R17
245/75R17
Diameter −0.0% · Good fit
285/60R18 → 245/65R18
245/65R18
Diameter +3.0% · Marginal fit — proceed with care
285/60R18 → 255/60R18
255/60R18
Diameter +4.7% · Marginal fit — proceed with care
285/60R18 → 255/65R18
255/65R18
Diameter +1.3% · Good fit
285/60R18 → 255/70R18
255/70R18
Diameter −1.8% · Good fit
285/60R18 → 265/65R18
265/65R18
Diameter −0.3% · Good fit
285/60R18 → 265/70R18
265/70R18
Diameter −3.5% · Marginal fit — proceed with care
285/60R18 → 275/60R18
275/60R18
Diameter +1.5% · Good fit
285/60R18 → 275/65R18
275/65R18
Diameter −1.9% · Good fit
285/60R18 → 275/70R18
275/70R18
Diameter −5.1% · Not recommended
265/65R18 → 285/60R18
265/65R18
Diameter +0.3% · Good fit
255/65R18 → 285/60R18
255/65R18
Diameter −1.3% · Good fit
275/60R18 → 285/60R18
275/60R18
Diameter −1.5% · Good fit
255/70R18 → 285/60R18
255/70R18
Diameter +1.9% · Good fit
275/65R18 → 285/60R18
275/65R18
Diameter +1.9% · Good fit
285/65R18 → 285/60R18
285/65R18
Diameter +3.6% · Marginal fit — proceed with care
245/65R18 → 285/60R18
245/65R18
Diameter −2.9% · Good fit
265/60R18 → 285/60R18
265/60R18
Diameter −3.0% · Marginal fit — proceed with care
305/60R18 → 285/60R18
305/60R18
Diameter +3.0% · Marginal fit — proceed with care
265/70R18 → 285/60R18
265/70R18
Diameter +3.6% · Marginal fit — proceed with care
255/60R18 → 285/60R18
255/60R18
Diameter −4.5% · Marginal fit — proceed with care
285/50R20 → 285/60R18
285/50R20
Diameter −0.8% · Good fit
245/75R17 → 285/60R18
245/75R17
Diameter +0.0% · Good fit
265/55R20 → 285/60R18
265/55R20
Diameter +0.0% · Good fit
285/60R18 → 285/65R18
285/65R18
Diameter −3.4% · Marginal fit — proceed with care
285/60R18 → 305/60R18
305/60R18
Diameter −2.9% · Good fit
285/60R18 → 255/60R19
255/60R19
Diameter +1.3% · Good fit
285/60R18 → 265/55R20
265/55R20
Diameter −0.0% · Good fit
285/60R18 → 285/50R20
285/50R20
Diameter +0.8% · Good fit
285/60R18 → 235/45R18
235/45R18
Diameter +19.5% · Not recommended
Common questions
- What is the overall diameter of a 285/60R18 tire?
- A 285/60R18 tire is about 31.46″ (799 mm) in overall diameter, with a sidewall height of 171.0 mm and a circumference of 98.85″.
- How many revolutions per mile does a 285/60R18 tire turn?
- A 285/60R18 turns roughly 641 revolutions per mile (398 per kilometre). This is the number that determines speedometer and odometer accuracy when you change tire size.
- What do the numbers in 285/60R18 mean?
- 285 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 285 × 60% = 171.0 mm tall.