245/65R18
Overall diameter
30.54″
776 mm
Sidewall height
6.27″
159.3 mm
Tread width
245 mm
9.6″
Circumference
95.94″
8.0 ft
Revs per mile
660
410 per km
Wheel diameter
18″
aspect ratio 65%
Cross-section
- Overall diameter
- 30.54″
- Sidewall (each side)
- 6.27″
- Wheel
- 18″
245/65R18 compared with other sizes
All 34 practical swaps involving 245/65R18 — diameter change, speedometer impact and a fit verdict for each.
245/65R18 → 245/75R16
245/75R16
Diameter +0.2% · Good fit
245/65R18 → 265/70R16
265/70R16
Diameter −0.2% · Good fit
245/65R18 → 235/60R18
235/60R18
Diameter +4.9% · Marginal fit — proceed with care
245/65R18 → 255/55R18
255/55R18
Diameter +5.2% · Not recommended
245/65R18 → 265/60R18
265/60R18
Diameter +0.1% · Good fit
245/65R18 → 255/70R16
255/70R16
Diameter +1.6% · Good fit
245/65R18 → 245/70R17
245/70R17
Diameter +0.1% · Good fit
245/65R18 → 235/65R18
235/65R18
Diameter +1.7% · Good fit
245/65R18 → 245/60R18
245/60R18
Diameter +3.3% · Marginal fit — proceed with care
265/60R18 → 245/65R18
265/60R18
Diameter −0.1% · Good fit
275/60R18 → 245/65R18
275/60R18
Diameter +1.5% · Good fit
255/60R18 → 245/65R18
255/60R18
Diameter −1.6% · Good fit
235/65R18 → 245/65R18
235/65R18
Diameter −1.7% · Good fit
255/65R18 → 245/65R18
255/65R18
Diameter +1.7% · Good fit
245/60R18 → 245/65R18
245/60R18
Diameter −3.2% · Marginal fit — proceed with care
285/60R18 → 245/65R18
285/60R18
Diameter +3.0% · Marginal fit — proceed with care
265/65R18 → 245/65R18
265/65R18
Diameter +3.4% · Marginal fit — proceed with care
245/70R17 → 245/65R18
245/70R17
Diameter −0.1% · Good fit
245/75R16 → 245/65R18
245/75R16
Diameter −0.2% · Good fit
235/60R18 → 245/65R18
235/60R18
Diameter −4.7% · Marginal fit — proceed with care
255/55R18 → 245/65R18
255/55R18
Diameter −4.9% · Marginal fit — proceed with care
255/70R18 → 245/65R18
255/70R18
Diameter +5.0% · Marginal fit — proceed with care
275/65R18 → 245/65R18
275/65R18
Diameter +5.0% · Not recommended
245/65R18 → 255/60R18
255/60R18
Diameter +1.6% · Good fit
245/65R18 → 255/65R18
255/65R18
Diameter −1.6% · Good fit
245/65R18 → 255/70R18
255/70R18
Diameter −4.7% · Marginal fit — proceed with care
245/65R18 → 265/65R18
265/65R18
Diameter −3.2% · Marginal fit — proceed with care
245/65R18 → 275/60R18
275/60R18
Diameter −1.5% · Good fit
245/65R18 → 275/65R18
275/65R18
Diameter −4.8% · Marginal fit — proceed with care
245/65R18 → 285/60R18
285/60R18
Diameter −2.9% · Good fit
245/65R18 → 265/55R19
265/55R19
Diameter +0.2% · Good fit
245/65R18 → 275/55R19
275/55R19
Diameter −1.2% · Good fit
245/65R18 → 265/50R20
265/50R20
Diameter +0.3% · Good fit
245/65R18 → 235/45R18
235/45R18
Diameter +16.0% · Not recommended
Common questions
- What is the overall diameter of a 245/65R18 tire?
- A 245/65R18 tire is about 30.54″ (776 mm) in overall diameter, with a sidewall height of 159.3 mm and a circumference of 95.94″.
- How many revolutions per mile does a 245/65R18 tire turn?
- A 245/65R18 turns roughly 660 revolutions per mile (410 per kilometre). This is the number that determines speedometer and odometer accuracy when you change tire size.
- What do the numbers in 245/65R18 mean?
- 245 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 245 × 65% = 159.3 mm tall.