2020 Buick Regal TourX tire size
Most common factory size
P235/50R18
- Factory sizes
- 1
- Across 3 trims
- Trims with no size
- 8
- Diameter
- 27.25 in
- Revs per mile
- 740
Tire sizes by trim
Source marks: one source
| Size | Trims | Width, mm | Sidewall, % of width | Rim, in | Diameter, in | Sidewall, in | Revs per mile |
|---|---|---|---|---|---|---|---|
| P235/50R18 | All 3 trims | 235 | 50 | 18 | 27.25 | 4.63 | 740 |
What P235/50R18 means
| Part | Number | Meaning |
|---|---|---|
| Type | P | Passenger car tire. |
| Width | 235 mm | Tread width. 9.3 in. |
| Sidewall | 50 | Sidewall height is 50% of the width. |
| Construction | R | Radial tire. |
| Rim | 18 in | Fits 18 in wheels. |
Other sizes that fit
Within 3% of the stock diameter. A common shop guideline, not a maker spec.
| Size | Rim, in | Diameter, in | Change | Speedo reads at 60 mph |
|---|---|---|---|---|
| 215/55R18 | 18 | 27.31 | +0.2% | 59.9 mph |
| 235/55R17 | 17 | 27.18 | -0.3% | 60.2 mph |
| 235/45R19 | 19 | 27.33 | +0.3% | 59.8 mph |
| 215/60R17 | 17 | 27.16 | -0.3% | 60.2 mph |
| 265/40R19 | 19 | 27.35 | +0.3% | 59.8 mph |
| 295/35R19 | 19 | 27.13 | -0.4% | 60.3 mph |
| 255/50R17 | 17 | 27.04 | -0.8% | 60.5 mph |
| 255/45R18 | 18 | 27.04 | -0.8% | 60.5 mph |
Checked against 292 factory sizes listed for 2009-2027 US models.
What this cannot tell you
Tire pressure is on the driver door sticker. Not in this data.
Optional wheel packages may differ.
- Two or more sources agree
- One source
- Model-level or estimate
- Sources differ