BMW Z4 tire and wheel sizes
The BMW Z4 was approved in Switzerland between 2003 and 2022 with tires from 225/50R16 to 275/35R19 on 16″, 17″, 18″, 19″ wheels. The most common sizes are 255/40R18, 275/40R18, 255/35R19. Some versions use different sizes front and rear (staggered fitment).
Sizes differ by engine, trim and market. Confirm with the tire placard (usually on the driver's door jamb), the owner's manual or the vehicle registration papers before buying tires or wheels.
Most common sizes
BMW Z4 (2018–2022) type G4Z
62 approved versions, e.g. Z4 sDrive30i, Z4 sDrive20i, Z4 M40i.
| Tire size | Axle | Load / speed | Rim and offset | Versions |
|---|---|---|---|---|
| 225/50R17 | Front | 98H | 7.5Jx17 ET24 | 14 |
| 225/50R17 | Rear | 98H | 8Jx17 ET23 | 14 |
| 225/45R18 | Front | 95Y | 8Jx18 ET20 | 48 |
| 255/40R18 | Front | 95Y | 8.5Jx18 ET30, 9Jx18 ET32 | 62 |
| 255/40R18 | Rear | 99V | 9Jx18 ET28/32 | 62 |
| 275/40R18 | Rear | 99Y | 10Jx18 ET40 | 62 |
| 255/35R19 | Front | 96Y | 9Jx19 ET32 | 62 |
| 275/35R19 | Rear | 100Y | 10Jx19 ET40 | 62 |
BMW Z4 (2010–2014) type ZR
18 approved versions, e.g. Z4 sDrive35i, Z4 sDrive35is, Z4 sDrive20i, Z4 sDrive28i.
BMW Z4 Roadster (2003–2007) type Z85
17 approved versions, e.g. Z4 Roadster 2.5i, Z4 Roadster 2.0i, Z4 Roadster 3.0i, Z4 Roadster 2.2i.
| Tire size | Axle | Load / speed | Rim and offset | Versions |
|---|---|---|---|---|
| 205/55R16 | Front & rear | 91H | 7Jx16 ET47 | 11 |
| 225/50R16 | Front & rear | 92V | 7Jx16 ET47 | 12 |
| 225/45R17 | Front & rear | 91W | 8Jx17 ET46/47 | 17 |
| 225/45R17 | Front | 91W | 8Jx17 ET47 | 3 |
| 245/40R17 | Rear | 91W | 8.5Jx17 ET50 | 3 |
| 255/40R17 | Rear | 94W | 8.5Jx17 ET50 | 14 |
| 225/40R18 | Front | 88W | 8Jx18 ET47 | 17 |
| 255/35R18 | Rear | 90W | 8.5Jx18 ET50 | 17 |
How to read this table
Rim and offset uses the European notation: 7Jx17 ET45 is a 7-inch wide, 17-inch diameter wheel with a 45 mm offset. "Versions" is how many approved versions list that size — a rough guide to how common it is. Load / speed is the most frequent service description (for example 91V) among them; your car may require a higher one.
Showing 97 of 102 approvals: rare special versions are left out to keep the page readable. Records were read from the German-language text and checked against the French text; 100 % matched exactly.
Source: Swiss Federal Roads Office (FEDRO/ASTRA), open government data. Original data (downloaded 2026-09-29). Data processed by us; errors in processing are ours, not the publisher's.