235/50R18
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 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% · Good fit
235/50R18 → 235/60R16
235/60R16
Diameter +0.6% · Good fit
235/50R18 → 235/55R17
235/55R17
Diameter +0.3% · Good fit
235/50R18 → 225/45R18
225/45R18
Diameter +4.9% · Marginal fit — proceed with care
235/50R18 → 235/45R18
235/45R18
Diameter +3.5% · Marginal fit — proceed with care
255/45R18 → 235/50R18
255/45R18
Diameter −0.8% · Good fit
245/45R18 → 235/50R18
245/45R18
Diameter −2.1% · Good fit
235/45R18 → 235/50R18
235/45R18
Diameter −3.4% · Marginal fit — proceed with care
235/55R18 → 235/50R18
235/55R18
Diameter +3.4% · Marginal fit — proceed with care
235/55R17 → 235/50R18
235/55R17
Diameter −0.3% · Good fit
235/45R19 → 235/50R18
235/45R19
Diameter +0.3% · Good fit
235/60R16 → 235/50R18
235/60R16
Diameter −0.5% · Good fit
255/40R18 → 235/50R18
255/40R18
Diameter −4.5% · Marginal fit — proceed with care
225/45R18 → 235/50R18
225/45R18
Diameter −4.7% · Marginal fit — proceed with care
225/60R18 → 235/50R18
225/60R18
Diameter +5.1% · Not recommended
265/35R20 → 235/50R18
265/35R20
Diameter +0.2% · Good fit
215/60R17 → 235/50R18
215/60R17
Diameter −0.3% · Good fit
255/40R19 → 235/50R18
255/40R19
Diameter −0.8% · Good fit
255/35R20 → 235/50R18
255/35R20
Diameter −0.8% · Good fit
235/50R18 → 245/45R18
245/45R18
Diameter +2.1% · Good fit
235/50R18 → 255/40R19
255/40R19
Diameter +0.8% · Good fit
235/50R18 → 275/40R19
275/40R19
Diameter −1.5% · Good fit
235/50R18 → 245/35R20
245/35R20
Diameter +1.9% · Good fit
235/50R18 → 255/35R20
255/35R20
Diameter +0.8% · Good fit
235/50R18 → 215/70R16
215/70R16
Diameter −2.1% · Good fit
235/50R18 → 225/65R16
225/65R16
Diameter −1.0% · Good fit
235/50R18 → 215/60R17
215/60R17
Diameter +0.3% · Good fit
235/50R18 → 225/60R17
225/60R17
Diameter −1.4% · Good fit
235/50R18 → 225/60R18
225/60R18
Diameter −4.8% · Marginal fit — proceed with care
235/50R18 → 235/55R18
235/55R18
Diameter −3.3% · Marginal fit — proceed with care
235/50R18 → 255/40R18
255/40R18
Diameter +4.7% · Marginal fit — proceed with care
235/50R18 → 255/45R18
255/45R18
Diameter +0.8% · Good fit
235/50R18 → 235/45R19
235/45R19
Diameter −0.3% · Good fit
235/50R18 → 245/40R20
245/40R20
Diameter −1.7% · Good fit
235/50R18 → 265/35R20
265/35R20
Diameter −0.2% · Good fit
235/50R18 → 275/35R20
275/35R20
Diameter −1.2% · Good fit
Common questions
- What is the overall diameter of a 235/50R18 tire?
- A 235/50R18 tire is about 27.25″ (692 mm) in overall diameter, with a sidewall height of 117.5 mm and a circumference of 85.61″.
- How many revolutions per mile does a 235/50R18 tire turn?
- A 235/50R18 turns roughly 740 revolutions per mile (460 per kilometre). This is the number that determines speedometer and odometer accuracy when you change tire size.
- What do the numbers in 235/50R18 mean?
- 235 is the tread width in millimetres, 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.