2023 BMW Z4 tire size
Most common factory size
P255/40R18
- Factory sizes
- 1
- Across 2 trims
- Trims with no size
- 1
- Diameter
- 26.03 in
- Revs per mile
- 775
Tire sizes by trim
Source marks: one source
| Size | Trims | Width, mm | Sidewall, % of width | Rim, in | Diameter, in | Sidewall, in | Revs per mile |
|---|---|---|---|---|---|---|---|
| P255/40R18 | All 2 trims | 255 | 40 | 18 | 26.03 | 4.02 | 775 |
What P255/40R18 means
| Part | Number | Meaning |
|---|---|---|
| Type | P | Passenger car tire. |
| Width | 255 mm | Tread width. 10.0 in. |
| Sidewall | 40 | Sidewall height is 40% 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 |
|---|---|---|---|---|
| 255/35R19 | 19 | 26.03 | -0.0% | 60.0 mph |
| 255/45R17 | 17 | 26.04 | +0.0% | 60.0 mph |
| 225/40R19 | 19 | 26.09 | +0.2% | 59.9 mph |
| 225/45R18 | 18 | 25.97 | -0.2% | 60.1 mph |
| 205/55R17 | 17 | 25.88 | -0.6% | 60.4 mph |
| 225/50R17 | 17 | 25.86 | -0.7% | 60.4 mph |
| 305/30R19 | 19 | 26.20 | +0.7% | 59.6 mph |
| 195/60R17 | 17 | 26.21 | +0.7% | 59.6 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