225/60R18
Overall diameter
28.63″
727 mm
Sidewall height
5.31″
135.0 mm
Tread width
225 mm
8.9″
Circumference
89.94″
7.5 ft
Revs per mile
704
438 per km
Wheel diameter
18″
aspect ratio 60%
Cross-section
- Overall diameter
- 28.63″
- Sidewall (each side)
- 5.31″
- Wheel
- 18″
225/60R18 compared with other sizes
All 27 practical swaps involving 225/60R18 — diameter change, speedometer impact and a fit verdict for each.
225/60R18 → 235/50R18
235/50R18
Diameter +5.1% · Not recommended
225/60R18 → 235/60R18
235/60R18
Diameter −1.6% · Good fit
225/60R18 → 255/55R18
255/55R18
Diameter −1.4% · Good fit
225/60R18 → 225/70R16
225/70R16
Diameter +0.8% · Good fit
225/60R18 → 225/75R16
225/75R16
Diameter −2.2% · Good fit
225/60R18 → 235/70R16
235/70R16
Diameter −1.1% · Good fit
225/60R18 → 225/65R17
225/65R17
Diameter +0.4% · Good fit
255/55R18 → 225/60R18
255/55R18
Diameter +1.4% · Good fit
235/55R18 → 225/60R18
235/55R18
Diameter −1.6% · Good fit
235/60R18 → 225/60R18
235/60R18
Diameter +1.7% · Good fit
245/60R18 → 225/60R18
245/60R18
Diameter +3.3% · Marginal fit — proceed with care
225/65R17 → 225/60R18
225/65R17
Diameter −0.4% · Good fit
225/70R16 → 225/60R18
225/70R16
Diameter −0.8% · Good fit
235/50R18 → 225/60R18
235/50R18
Diameter −4.8% · Marginal fit — proceed with care
235/65R18 → 225/60R18
235/65R18
Diameter +4.9% · Marginal fit — proceed with care
255/60R18 → 225/60R18
255/60R18
Diameter +5.0% · Marginal fit — proceed with care
245/45R20 → 225/60R18
245/45R20
Diameter +0.2% · Good fit
225/75R16 → 225/60R18
225/75R16
Diameter +2.3% · Good fit
235/70R16 → 225/60R18
235/70R16
Diameter +1.1% · Good fit
235/50R19 → 225/60R18
235/50R19
Diameter −1.3% · Good fit
235/65R17 → 225/60R18
235/65R17
Diameter +1.4% · Good fit
225/60R18 → 235/55R18
235/55R18
Diameter +1.6% · Good fit
225/60R18 → 235/65R18
235/65R18
Diameter −4.7% · Marginal fit — proceed with care
225/60R18 → 245/60R18
245/60R18
Diameter −3.2% · Marginal fit — proceed with care
225/60R18 → 255/60R18
255/60R18
Diameter −4.7% · Marginal fit — proceed with care
225/60R18 → 245/45R20
245/45R20
Diameter −0.2% · Good fit
225/60R18 → 235/45R18
235/45R18
Diameter +8.7% · Not recommended
Common questions
- What is the overall diameter of a 225/60R18 tire?
- A 225/60R18 tire is about 28.63″ (727 mm) in overall diameter, with a sidewall height of 135.0 mm and a circumference of 89.94″.
- How many revolutions per mile does a 225/60R18 tire turn?
- A 225/60R18 turns roughly 704 revolutions per mile (438 per kilometre). This is the number that determines speedometer and odometer accuracy when you change tire size.
- What do the numbers in 225/60R18 mean?
- 225 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 225 × 60% = 135.0 mm tall.