235/50R18
A 235/50R18 tire is 27.25 inches tall and 9.3 inches wide, with a 4.63-inch sidewall, mounted on a 18-inch wheel.
Common fitments: Equinox, Tiguan, CX-5
Overall diameter
27.25″
692 mm
Sidewall height
4.63″
117.5 mm
Tread width
235 mm
9.3″
Circumference
85.61″
7.1 ft
Revs per mile
740
460 per km
Wheel diameter
18″
aspect ratio 50%
Cross-section
- Overall diameter
- 27.25″
- Sidewall (each side)
- 4.63″
- Wheel
- 18″
235/50R18 in inches and millimeters
Every dimension of a 235/50R18, converted both ways. Calculated from the size code, accurate to about 1%.
| Measurement | Inches | Millimeters |
|---|---|---|
| Overall diameter (height) | 27.25″ | 692 mm |
| Tread width | 9.3″ | 235 mm |
| Sidewall height | 4.63″ | 117.5 mm |
| Wheel diameter | 18″ | 457 mm |
| Circumference | 85.61″ | 2175 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.
235/50R18 compared with other sizes
All 36 practical swaps involving 235/50R18 — diameter change, speedometer impact and a fit verdict for each.
235/50R18 → 215/65R16
215/65R16
Diameter +0.9% · This fits
235/50R18 → 235/60R16
235/60R16
Diameter +0.6% · This fits
235/50R18 → 235/55R17
235/55R17
Diameter +0.3% · This fits
235/50R18 → 225/45R18
225/45R18
Diameter +4.9% · Borderline. Check clearance first
235/50R18 → 235/45R18
235/45R18
Diameter +3.5% · Borderline. Check clearance first
255/45R18 → 235/50R18
255/45R18
Diameter −0.8% · This fits
245/45R18 → 235/50R18
245/45R18
Diameter −2.1% · This fits
235/45R18 → 235/50R18
235/45R18
Diameter −3.4% · Borderline. Check clearance first
235/55R18 → 235/50R18
235/55R18
Diameter +3.4% · Borderline. Check clearance first
235/55R17 → 235/50R18
235/55R17
Diameter −0.3% · This fits
235/45R19 → 235/50R18
235/45R19
Diameter +0.3% · This fits
235/60R16 → 235/50R18
235/60R16
Diameter −0.5% · This fits
255/40R18 → 235/50R18
255/40R18
Diameter −4.5% · Borderline. Check clearance first
225/45R18 → 235/50R18
225/45R18
Diameter −4.7% · Borderline. Check clearance first
225/60R18 → 235/50R18
225/60R18
Diameter +5.1% · Too big a jump
265/35R20 → 235/50R18
265/35R20
Diameter +0.2% · This fits
215/60R17 → 235/50R18
215/60R17
Diameter −0.3% · This fits
255/40R19 → 235/50R18
255/40R19
Diameter −0.8% · This fits
255/35R20 → 235/50R18
255/35R20
Diameter −0.8% · This fits
235/50R18 → 245/45R18
245/45R18
Diameter +2.1% · This fits
235/50R18 → 255/40R19
255/40R19
Diameter +0.8% · This fits
235/50R18 → 275/40R19
275/40R19
Diameter −1.5% · This fits
235/50R18 → 245/35R20
245/35R20
Diameter +1.9% · This fits
235/50R18 → 255/35R20
255/35R20
Diameter +0.8% · This fits
235/50R18 → 215/70R16
215/70R16
Diameter −2.1% · This fits
235/50R18 → 225/65R16
225/65R16
Diameter −1.0% · This fits
235/50R18 → 215/60R17
215/60R17
Diameter +0.3% · This fits
235/50R18 → 225/60R17
225/60R17
Diameter −1.4% · This fits
235/50R18 → 225/60R18
225/60R18
Diameter −4.8% · Borderline. Check clearance first
235/50R18 → 235/55R18
235/55R18
Diameter −3.3% · Borderline. Check clearance first
235/50R18 → 255/40R18
255/40R18
Diameter +4.7% · Borderline. Check clearance first
235/50R18 → 255/45R18
255/45R18
Diameter +0.8% · This fits
235/50R18 → 235/45R19
235/45R19
Diameter −0.3% · This fits
235/50R18 → 245/40R20
245/40R20
Diameter −1.7% · This fits
235/50R18 → 265/35R20
265/35R20
Diameter −0.2% · This fits
235/50R18 → 275/35R20
275/35R20
Diameter −1.2% · This fits
Common questions
- What is 235/50R18 in inches?
- A 235/50R18 tire is 27.25 inches tall and 9.3 inches wide, with a 4.63-inch sidewall, mounted on a 18-inch wheel. In metric that is 692 mm tall and 235 mm wide. The circumference is 85.61 inches.
- How tall is a 235/50R18 tire?
- 27.25 inches, or 692 mm. That is the overall diameter, wheel included. It turns about 740 times per mile, which is what your speedometer counts.
- What do the numbers in 235/50R18 mean?
- 235 is the tread width in millimeters, 50 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 × 50% = 117.5 mm tall.