245/65R18
A 245/65R18 tire is 30.54 inches tall and 9.6 inches wide, with a 6.27-inch sidewall, mounted on a 18-inch wheel.
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 in inches and millimeters
Every dimension of a 245/65R18, converted both ways. Calculated from the size code, accurate to about 1%.
| Measurement | Inches | Millimeters |
|---|---|---|
| Overall diameter (height) | 30.54″ | 776 mm |
| Tread width | 9.6″ | 245 mm |
| Sidewall height | 6.27″ | 159.3 mm |
| Wheel diameter | 18″ | 457 mm |
| Circumference | 95.94″ | 2437 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.
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% · This fits
245/65R18 → 265/70R16
265/70R16
Diameter −0.2% · This fits
245/65R18 → 235/60R18
235/60R18
Diameter +4.9% · Borderline. Check clearance first
245/65R18 → 255/55R18
255/55R18
Diameter +5.2% · Too big a jump
245/65R18 → 265/60R18
265/60R18
Diameter +0.1% · This fits
245/65R18 → 255/70R16
255/70R16
Diameter +1.6% · This fits
245/65R18 → 245/70R17
245/70R17
Diameter +0.1% · This fits
245/65R18 → 235/65R18
235/65R18
Diameter +1.7% · This fits
245/65R18 → 245/60R18
245/60R18
Diameter +3.3% · Borderline. Check clearance first
265/60R18 → 245/65R18
265/60R18
Diameter −0.1% · This fits
275/60R18 → 245/65R18
275/60R18
Diameter +1.5% · This fits
255/60R18 → 245/65R18
255/60R18
Diameter −1.6% · This fits
235/65R18 → 245/65R18
235/65R18
Diameter −1.7% · This fits
255/65R18 → 245/65R18
255/65R18
Diameter +1.7% · This fits
245/60R18 → 245/65R18
245/60R18
Diameter −3.2% · Borderline. Check clearance first
285/60R18 → 245/65R18
285/60R18
Diameter +3.0% · Borderline. Check clearance first
265/65R18 → 245/65R18
265/65R18
Diameter +3.4% · Borderline. Check clearance first
245/70R17 → 245/65R18
245/70R17
Diameter −0.1% · This fits
245/75R16 → 245/65R18
245/75R16
Diameter −0.2% · This fits
235/60R18 → 245/65R18
235/60R18
Diameter −4.7% · Borderline. Check clearance first
255/55R18 → 245/65R18
255/55R18
Diameter −4.9% · Borderline. Check clearance first
255/70R18 → 245/65R18
255/70R18
Diameter +5.0% · Borderline. Check clearance first
275/65R18 → 245/65R18
275/65R18
Diameter +5.0% · Too big a jump
245/65R18 → 255/60R18
255/60R18
Diameter +1.6% · This fits
245/65R18 → 255/65R18
255/65R18
Diameter −1.6% · This fits
245/65R18 → 255/70R18
255/70R18
Diameter −4.7% · Borderline. Check clearance first
245/65R18 → 265/65R18
265/65R18
Diameter −3.2% · Borderline. Check clearance first
245/65R18 → 275/60R18
275/60R18
Diameter −1.5% · This fits
245/65R18 → 275/65R18
275/65R18
Diameter −4.8% · Borderline. Check clearance first
245/65R18 → 285/60R18
285/60R18
Diameter −2.9% · This fits
245/65R18 → 265/55R19
265/55R19
Diameter +0.2% · This fits
245/65R18 → 275/55R19
275/55R19
Diameter −1.2% · This fits
245/65R18 → 265/50R20
265/50R20
Diameter +0.3% · This fits
245/65R18 → 235/45R18
235/45R18
Diameter +16.0% · Too big a jump
Common questions
- What is 245/65R18 in inches?
- A 245/65R18 tire is 30.54 inches tall and 9.6 inches wide, with a 6.27-inch sidewall, mounted on a 18-inch wheel. In metric that is 776 mm tall and 245 mm wide. The circumference is 95.94 inches.
- How tall is a 245/65R18 tire?
- 30.54 inches, or 776 mm. That is the overall diameter, wheel included. It turns about 660 times per mile, which is what your speedometer counts.
- What do the numbers in 245/65R18 mean?
- 245 is the tread width in millimeters, 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.