BMW Z4 tyre sizes
Factory tyre sizes for the BMW Z4 as listed in the maker's official documents. Each of the 10 rows links its source document.
225/45R18⌀ 659.7 mm255/40R18⌀ 661.2 mm275/40R18⌀ 677.2 mm255/35R19⌀ 661.1 mm275/35R19⌀ 675.1 mm285/30R20⌀ 679.0 mm
Some rows come from an official document of another country (DE). Your market's version may differ; compare with the door label.
Z4 G292025–2026
| Version | hp | Front | Rear | Wheel | Source |
|---|---|---|---|---|---|
| sDrive20i - standard | 197 | 225/45R18 | 255/40R18 | 8Jx18 / 9Jx18 | Document ↗DE |
| sDrive20i - optional | 197 | 255/40R18 | 275/40R18 | 9Jx18 / 10Jx18 | Document ↗DE |
| sDrive20i - optional | 197 | 255/35R19 | 275/35R19 | 9Jx19 / 10Jx19 | Document ↗DE |
| sDrive30i - standard | 258 | 225/45R18 | 255/40R18 | 8Jx18 / 9Jx18 | Document ↗DE |
| sDrive30i - optional | 258 | 255/40R18 | 275/40R18 | 9Jx18 / 10Jx18 | Document ↗DE |
| sDrive30i - optional | 258 | 255/35R19 | 275/35R19 | 9Jx19 / 10Jx19 | Document ↗DE |
| M40i - standard | 340 | 255/40R18 | 275/40R18 | 9Jx18 / 10Jx18 | Document ↗DE |
| M40i - optional | 340 | 255/35R19 | 275/35R19 | 9Jx19 / 10Jx19 | Document ↗DE |
| M40i - optional | 340 | 255/35R19 | 285/30R20 | 9Jx19 / 10Jx20 | Document ↗DE |
| M40i Pure Impulse - standard | 340 | 255/35R19 | 285/30R20 | 9Jx19 / 10Jx20 | Document ↗DE |
Sizes that can replace 255/40R18
This is a calculation, not a factory approval. The list shows sizes whose overall diameter is within ±3%. Check your door label, certificate of conformity (CoC) or tyre shop before fitting.
255/45R17+0.0%
255/35R19−0.0%255/30R20−0.0%
285/40R17−0.2%
285/35R18−0.7%
235/50R17+0.8%
265/30R20+0.9%
245/30R20−0.9%
265/35R19+1.0%
245/35R19−1.1%FAQ
What tyre size does the BMW Z4 use?
Factory tyre sizes listed in official documents for the BMW Z4: 225/45R18, 255/40R18, 275/40R18, 255/35R19, 275/35R19, 285/30R20. The most common size is 255/40R18.
What wheel size does the BMW Z4 have?
The BMW Z4 was sold with 18, 19, 20 inch wheels in the sourced versions. The number after R on your tyre's sidewall tells you which one you have.
Can I fit a different tyre size on the BMW Z4?
A size whose overall diameter is within 3% of the factory size, with no lower load index or speed rating, usually fits. For final approval check the door label, CoC and your tyre shop.