185/65R15
Common fitments: Rio, Accent, Mirage
Overall diameter
24.47″
622 mm
Sidewall height
4.73″
120.3 mm
Tread width
185 mm
7.3″
Circumference
76.87″
6.4 ft
Revs per mile
824
512 per km
Wheel diameter
15″
aspect ratio 65%
Cross-section
- Overall diameter
- 24.47″
- Sidewall (each side)
- 4.73″
- Wheel
- 15″
185/65R15 compared with other sizes
All 25 practical swaps involving 185/65R15 — diameter change, speedometer impact and a fit verdict for each.
185/65R15 → 175/65R15
175/65R15
Diameter +2.1% · Good fit
185/65R15 → 185/60R15
185/60R15
Diameter +3.1% · Marginal fit — proceed with care
195/60R15 → 185/65R15
195/60R15
Diameter −1.0% · Good fit
185/60R15 → 185/65R15
185/60R15
Diameter −3.0% · Good fit
175/65R15 → 185/65R15
175/65R15
Diameter −2.1% · Good fit
195/65R15 → 185/65R15
195/65R15
Diameter +2.1% · Good fit
205/65R15 → 185/65R15
205/65R15
Diameter +4.2% · Marginal fit — proceed with care
195/55R16 → 185/65R15
195/55R16
Diameter −0.1% · Good fit
215/45R17 → 185/65R15
215/45R17
Diameter +0.6% · Good fit
185/55R16 → 185/65R15
185/55R16
Diameter −1.9% · Good fit
205/55R16 → 185/65R15
205/55R16
Diameter +1.7% · Good fit
225/45R17 → 185/65R15
225/45R17
Diameter +2.1% · Good fit
205/50R17 → 185/65R15
205/50R17
Diameter +2.5% · Good fit
195/50R16 → 185/65R15
195/50R16
Diameter −3.2% · Marginal fit — proceed with care
215/55R16 → 185/65R15
215/55R16
Diameter +3.4% · Marginal fit — proceed with care
215/50R17 → 185/65R15
215/50R17
Diameter +4.1% · Marginal fit — proceed with care
185/65R15 → 195/60R15
195/60R15
Diameter +1.1% · Good fit
185/65R15 → 195/65R15
195/65R15
Diameter −2.0% · Good fit
185/65R15 → 205/65R15
205/65R15
Diameter −4.0% · Marginal fit — proceed with care
185/65R15 → 185/55R16
185/55R16
Diameter +1.9% · Good fit
185/65R15 → 195/50R16
195/50R16
Diameter +3.3% · Marginal fit — proceed with care
185/65R15 → 195/55R16
195/55R16
Diameter +0.1% · Good fit
185/65R15 → 205/55R16
205/55R16
Diameter −1.6% · Good fit
185/65R15 → 215/45R17
215/45R17
Diameter −0.6% · Good fit
185/65R15 → 225/45R17
225/45R17
Diameter −2.0% · Good fit
Common questions
- What is the overall diameter of a 185/65R15 tire?
- A 185/65R15 tire is about 24.47″ (622 mm) in overall diameter, with a sidewall height of 120.3 mm and a circumference of 76.87″.
- How many revolutions per mile does a 185/65R15 tire turn?
- A 185/65R15 turns roughly 824 revolutions per mile (512 per kilometre). This is the number that determines speedometer and odometer accuracy when you change tire size.
- What do the numbers in 185/65R15 mean?
- 185 is the tread width in millimetres, 65 is the aspect ratio — the sidewall height as a percentage of the tread width — and 15 is the wheel diameter in inches. So the sidewall is 185 × 65% = 120.3 mm tall.