245/60R18
Common fitments: Grand Cherokee, Explorer
Overall diameter
29.57″
751 mm
Sidewall height
5.79″
147.0 mm
Tread width
245 mm
9.6″
Circumference
92.91″
7.7 ft
Revs per mile
682
424 per km
Wheel diameter
18″
aspect ratio 60%
Cross-section
- Overall diameter
- 29.57″
- Sidewall (each side)
- 5.79″
- Wheel
- 18″
245/60R18 compared with other sizes
All 34 practical swaps involving 245/60R18 — diameter change, speedometer impact and a fit verdict for each.
245/60R18 → 235/60R18
235/60R18
Diameter +1.6% · Good fit
245/60R18 → 255/55R18
255/55R18
Diameter +1.8% · Good fit
245/60R18 → 265/60R18
265/60R18
Diameter −3.1% · Marginal fit — proceed with care
245/60R18 → 265/50R19
265/50R19
Diameter +0.5% · Good fit
245/60R18 → 275/45R20
275/45R20
Diameter −0.6% · Good fit
245/60R18 → 225/75R16
225/75R16
Diameter +1.0% · Good fit
245/60R18 → 245/70R16
245/70R16
Diameter +0.2% · Good fit
245/60R18 → 255/70R16
255/70R16
Diameter −1.6% · Good fit
245/60R18 → 245/65R17
245/65R17
Diameter +0.1% · Good fit
245/60R18 → 225/60R18
225/60R18
Diameter +3.3% · Marginal fit — proceed with care
245/60R18 → 235/55R18
235/55R18
Diameter +5.0% · Marginal fit — proceed with care
245/60R18 → 235/65R18
235/65R18
Diameter −1.5% · Good fit
235/65R18 → 245/60R18
235/65R18
Diameter +1.5% · Good fit
255/60R18 → 245/60R18
255/60R18
Diameter +1.6% · Good fit
235/60R18 → 245/60R18
235/60R18
Diameter −1.6% · Good fit
255/55R18 → 245/60R18
255/55R18
Diameter −1.8% · Good fit
245/65R18 → 245/60R18
245/65R18
Diameter +3.3% · Marginal fit — proceed with care
265/60R18 → 245/60R18
265/60R18
Diameter +3.2% · Marginal fit — proceed with care
225/60R18 → 245/60R18
225/60R18
Diameter −3.2% · Marginal fit — proceed with care
245/55R19 → 245/60R18
245/55R19
Diameter +0.1% · Good fit
245/65R17 → 245/60R18
245/65R17
Diameter −0.1% · Good fit
245/70R16 → 245/60R18
245/70R16
Diameter −0.2% · Good fit
245/50R20 → 245/60R18
245/50R20
Diameter +0.2% · Good fit
235/55R18 → 245/60R18
235/55R18
Diameter −4.7% · Marginal fit — proceed with care
275/60R18 → 245/60R18
275/60R18
Diameter +4.8% · Marginal fit — proceed with care
255/65R18 → 245/60R18
255/65R18
Diameter +5.0% · Marginal fit — proceed with care
245/60R18 → 245/65R18
245/65R18
Diameter −3.2% · Marginal fit — proceed with care
245/60R18 → 255/60R18
255/60R18
Diameter −1.6% · Good fit
245/60R18 → 255/65R18
255/65R18
Diameter −4.8% · Marginal fit — proceed with care
245/60R18 → 275/60R18
275/60R18
Diameter −4.6% · Marginal fit — proceed with care
245/60R18 → 245/55R19
245/55R19
Diameter −0.1% · Good fit
245/60R18 → 245/50R20
245/50R20
Diameter −0.2% · Good fit
245/60R18 → 265/45R20
265/45R20
Diameter +0.6% · Good fit
245/60R18 → 235/45R18
235/45R18
Diameter +12.3% · Not recommended
Common questions
- What is the overall diameter of a 245/60R18 tire?
- A 245/60R18 tire is about 29.57″ (751 mm) in overall diameter, with a sidewall height of 147.0 mm and a circumference of 92.91″.
- How many revolutions per mile does a 245/60R18 tire turn?
- A 245/60R18 turns roughly 682 revolutions per mile (424 per kilometre). This is the number that determines speedometer and odometer accuracy when you change tire size.
- What do the numbers in 245/60R18 mean?
- 245 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 245 × 60% = 147.0 mm tall.