235/45R18
Most common 18″ sizeA 235/45R18 tire is 26.33 inches tall and 9.3 inches wide, with a 4.16-inch sidewall, mounted on a 18-inch wheel.
Common fitments: Camry, Accord, Model 3
Overall diameter
26.33″
669 mm
Sidewall height
4.16″
105.8 mm
Tread width
235 mm
9.3″
Circumference
82.71″
6.9 ft
Revs per mile
766
476 per km
Wheel diameter
18″
aspect ratio 45%
Cross-section
- Overall diameter
- 26.33″
- Sidewall (each side)
- 4.16″
- Wheel
- 18″
235/45R18 in inches and millimeters
Every dimension of a 235/45R18, converted both ways. Calculated from the size code, accurate to about 1%.
| Measurement | Inches | Millimeters |
|---|---|---|
| Overall diameter (height) | 26.33″ | 669 mm |
| Tread width | 9.3″ | 235 mm |
| Sidewall height | 4.16″ | 105.8 mm |
| Wheel diameter | 18″ | 457 mm |
| Circumference | 82.71″ | 2101 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.
235/45R18 compared with other sizes
All 54 practical swaps involving 235/45R18 — diameter change, speedometer impact and a fit verdict for each.
235/45R18 → 215/60R16
215/60R16
Diameter +0.6% · Fitment not determined
235/45R18 → 225/60R16
225/60R16
Diameter −1.1% · Fitment not determined
235/45R18 → 215/55R17
215/55R17
Diameter +0.1% · Fitment not determined
235/45R18 → 225/40R18
225/40R18
Diameter +4.9% · Fitment not determined
235/45R18 → 225/45R18
225/45R18
Diameter +1.4% · Fitment not determined
235/45R18 → 235/40R18
235/40R18
Diameter +3.6% · Fitment not determined
255/40R18 → 235/45R18
255/40R18
Diameter −1.1% · Fitment not determined
225/45R18 → 235/45R18
225/45R18
Diameter −1.3% · Fitment not determined
245/45R18 → 235/45R18
245/45R18
Diameter +1.3% · Fitment not determined
235/40R18 → 235/45R18
235/40R18
Diameter −3.5% · Fitment not determined
235/50R18 → 235/45R18
235/50R18
Diameter +3.5% · Fitment not determined
245/40R18 → 235/45R18
245/40R18
Diameter −2.3% · Fitment not determined
255/45R18 → 235/45R18
255/45R18
Diameter +2.7% · Fitment not determined
235/40R19 → 235/45R18
235/40R19
Diameter +0.3% · Fitment not determined
225/40R18 → 235/45R18
225/40R18
Diameter −4.7% · Fitment not determined
215/55R17 → 235/45R18
215/55R17
Diameter −0.1% · Fitment not determined
205/65R16 → 235/45R18
205/65R16
Diameter +0.6% · Fitment not determined
215/60R16 → 235/45R18
215/60R16
Diameter −0.6% · Fitment not determined
255/35R19 → 235/45R18
255/35R19
Diameter −1.1% · Fitment not determined
225/60R16 → 235/45R18
225/60R16
Diameter +1.2% · Fitment not determined
235/45R18 → 235/50R18
235/50R18
Diameter −3.4% · Fitment not determined
235/45R18 → 245/40R18
245/40R18
Diameter +2.4% · Fitment not determined
235/45R18 → 245/45R18
245/45R18
Diameter −1.3% · Fitment not determined
235/45R18 → 235/40R19
235/40R19
Diameter −0.3% · Fitment not determined
235/45R18 → 245/35R19
245/35R19
Diameter +2.2% · Fitment not determined
235/45R18 → 245/40R19
245/40R19
Diameter −1.5% · Fitment not determined
235/45R18 → 255/35R19
255/35R19
Diameter +1.1% · Fitment not determined
235/45R18 → 245/35R20
245/35R20
Diameter −1.6% · Fitment not determined
235/45R18 → 205/65R16
205/65R16
Diameter −0.6% · Fitment not determined
235/45R18 → 255/40R18
255/40R18
Diameter +1.1% · Fitment not determined
235/45R18 → 255/45R18
255/45R18
Diameter −2.6% · Fitment not determined
235/60R18 → 235/45R18
235/60R18
Diameter +10.5% · Fitment not determined
255/55R18 → 235/45R18
255/55R18
Diameter +10.3% · Fitment not determined
265/60R18 → 235/45R18
265/60R18
Diameter +15.9% · Fitment not determined
225/60R18 → 235/45R18
225/60R18
Diameter +8.7% · Fitment not determined
235/55R18 → 235/45R18
235/55R18
Diameter +7.0% · Fitment not determined
235/65R18 → 235/45R18
235/65R18
Diameter +14.1% · Fitment not determined
245/60R18 → 235/45R18
245/60R18
Diameter +12.3% · Fitment not determined
245/65R18 → 235/45R18
245/65R18
Diameter +16.0% · Fitment not determined
255/60R18 → 235/45R18
255/60R18
Diameter +14.1% · Fitment not determined
255/65R18 → 235/45R18
255/65R18
Diameter +17.9% · Fitment not determined
255/70R18 → 235/45R18
255/70R18
Diameter +21.8% · Fitment not determined
265/65R18 → 235/45R18
265/65R18
Diameter +19.9% · Fitment not determined
265/70R18 → 235/45R18
265/70R18
Diameter +23.9% · Fitment not determined
275/60R18 → 235/45R18
275/60R18
Diameter +17.7% · Fitment not determined
275/65R18 → 235/45R18
275/65R18
Diameter +21.8% · Fitment not determined
275/70R18 → 235/45R18
275/70R18
Diameter +25.9% · Fitment not determined
285/60R18 → 235/45R18
285/60R18
Diameter +19.5% · Fitment not determined
285/65R18 → 235/45R18
285/65R18
Diameter +23.8% · Fitment not determined
285/70R18 → 235/45R18
285/70R18
Diameter +28.0% · Fitment not determined
295/70R18 → 235/45R18
295/70R18
Diameter +30.1% · Fitment not determined
305/60R18 → 235/45R18
305/60R18
Diameter +23.1% · Fitment not determined
235/45R18 → 225/45R17
225/45R17
Diameter +5.4% · Fitment not determined
245/40R19 → 235/45R18
245/40R19
Diameter +1.5% · Fitment not determined
Common questions
- What is 235/45R18 in inches?
- A 235/45R18 tire is 26.33 inches tall and 9.3 inches wide, with a 4.16-inch sidewall, mounted on a 18-inch wheel. In metric that is 669 mm tall and 235 mm wide. The circumference is 82.71 inches.
- How tall is a 235/45R18 tire?
- 26.33 inches, or 669 mm. That is the overall diameter, wheel included. It turns about 766 times per mile, which is what your speedometer counts.
- What do the numbers in 235/45R18 mean?
- 235 is the tread width in millimeters, 45 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 235 × 45% = 105.8 mm tall.