225/60R18
A 225/60R18 tire is 28.63 inches tall and 8.9 inches wide, with a 5.31-inch sidewall, mounted on a 18-inch wheel.
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 in inches and millimeters
Every dimension of a 225/60R18, converted both ways. Calculated from the size code, accurate to about 1%.
| Measurement | Inches | Millimeters |
|---|---|---|
| Overall diameter (height) | 28.63″ | 727 mm |
| Tread width | 8.9″ | 225 mm |
| Sidewall height | 5.31″ | 135.0 mm |
| Wheel diameter | 18″ | 457 mm |
| Circumference | 89.94″ | 2285 mm |
Nominal dimensions from the size code. A real tire varies by a few millimeters between manufacturers, and a loaded tire sits slightly shorter than its free diameter.
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% · Too big a jump
225/60R18 → 235/60R18
235/60R18
Diameter −1.6% · This fits
225/60R18 → 255/55R18
255/55R18
Diameter −1.4% · This fits
225/60R18 → 225/70R16
225/70R16
Diameter +0.8% · This fits
225/60R18 → 225/75R16
225/75R16
Diameter −2.2% · This fits
225/60R18 → 235/70R16
235/70R16
Diameter −1.1% · This fits
225/60R18 → 225/65R17
225/65R17
Diameter +0.4% · This fits
255/55R18 → 225/60R18
255/55R18
Diameter +1.4% · This fits
235/55R18 → 225/60R18
235/55R18
Diameter −1.6% · This fits
235/60R18 → 225/60R18
235/60R18
Diameter +1.7% · This fits
245/60R18 → 225/60R18
245/60R18
Diameter +3.3% · Borderline. Check clearance first
225/65R17 → 225/60R18
225/65R17
Diameter −0.4% · This fits
225/70R16 → 225/60R18
225/70R16
Diameter −0.8% · This fits
235/50R18 → 225/60R18
235/50R18
Diameter −4.8% · Borderline. Check clearance first
235/65R18 → 225/60R18
235/65R18
Diameter +4.9% · Borderline. Check clearance first
255/60R18 → 225/60R18
255/60R18
Diameter +5.0% · Borderline. Check clearance first
245/45R20 → 225/60R18
245/45R20
Diameter +0.2% · This fits
225/75R16 → 225/60R18
225/75R16
Diameter +2.3% · This fits
235/70R16 → 225/60R18
235/70R16
Diameter +1.1% · This fits
235/50R19 → 225/60R18
235/50R19
Diameter −1.3% · This fits
235/65R17 → 225/60R18
235/65R17
Diameter +1.4% · This fits
225/60R18 → 235/55R18
235/55R18
Diameter +1.6% · This fits
225/60R18 → 235/65R18
235/65R18
Diameter −4.7% · Borderline. Check clearance first
225/60R18 → 245/60R18
245/60R18
Diameter −3.2% · Borderline. Check clearance first
225/60R18 → 255/60R18
255/60R18
Diameter −4.7% · Borderline. Check clearance first
225/60R18 → 245/45R20
245/45R20
Diameter −0.2% · This fits
225/60R18 → 235/45R18
235/45R18
Diameter +8.7% · Too big a jump
Common questions
- What is 225/60R18 in inches?
- A 225/60R18 tire is 28.63 inches tall and 8.9 inches wide, with a 5.31-inch sidewall, mounted on a 18-inch wheel. In metric that is 727 mm tall and 225 mm wide. The circumference is 89.94 inches.
- How tall is a 225/60R18 tire?
- 28.63 inches, or 727 mm. That is the overall diameter, wheel included. It turns about 704 times per mile, which is what your speedometer counts.
- What do the numbers in 225/60R18 mean?
- 225 is the tread width in millimeters, 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.