2012 BMW Z4 — sDrive35is
The 2012 BMW Z4 sDrive35is shipped with 4 different factory tire sizes, depending on the wheel package it left the factory with (this can also reflect a staggered front/rear setup). Check your tire sidewall or door placard to confirm which one applies to your vehicle.
This trim shipped with more than one tire size (staggered fitment, front/rear, or optional wheel package). Confirm which one matches your vehicle by checking your tire sidewall or door placard.
225/40R18 (Front)
| Section width | 225 mm |
|---|---|
| Aspect ratio (sidewall height) | 40% (90 mm) |
| Rim diameter | 18" |
| Overall tire diameter | ~25.1" |
| Revolutions per mile | ~804 |
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255/35R18 (Rear)
| Section width | 255 mm |
|---|---|
| Aspect ratio (sidewall height) | 35% (89.3 mm) |
| Rim diameter | 18" |
| Overall tire diameter | ~25" |
| Revolutions per mile | ~806 |
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225/35R19 (Front)
| Section width | 225 mm |
|---|---|
| Aspect ratio (sidewall height) | 35% (78.8 mm) |
| Rim diameter | 19" |
| Overall tire diameter | ~25.2" |
| Revolutions per mile | ~800 |
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255/30R19 (Rear)
| Section width | 255 mm |
|---|---|
| Aspect ratio (sidewall height) | 30% (76.5 mm) |
| Rim diameter | 19" |
| Overall tire diameter | ~25" |
| Revolutions per mile | ~806 |
Compare prices at:
What this size means for your BMW Z4
On the 2012 BMW Z4 sDrive35is, the factory 225/40R18 measures about 25.1″ in overall diameter with a 90 mm (3.5″) sidewall, and completes roughly 804 revolutions per mile. Its 40-series aspect ratio gives a low-profile sidewall tuned for sharper handling, common on sport trims and larger-wheel packages. In tire terms it is a passenger (P-metric / Euro-metric) size.
This is a staggered setup: the front axle runs 225/40R18 and the rear runs 255/35R18. The two sizes are not interchangeable, so order each for its correct axle and don't rotate front-to-rear.
Other 2012 BMW Z4 trims
- sDrive28i Base Model 225/45R17
- sDrive30i Base Model 225/45R17
- sDrive30i M Sport Package 225/40R18 (Front) / 255/35R18 (Rear)
- sDrive30i Sport Package 225/40R18 (Front) / 255/35R18 (Rear)
- sDrive35i Base Model 225/40R18 (Front) / 255/35R18 (Rear) / 225/35R19 (Front) / 255/30R19 (Rear)
- sDrive35i M Sport Package 225/40R18 (Front) / 255/35R18 (Rear) / 225/35R19 (Front) / 255/30R19 (Rear)
- sDrive35i Sport Package 225/40R18 (Front) / 255/35R18 (Rear) / 225/35R19 (Front) / 255/30R19 (Rear)
BMW Z4 tire sizes by year
- 2026 BMW Z4 255/40R18 (Front) / 275/40R18 (Rear) / 255/35R19 (Front) / 275/35R19 (Rear) / 285/30R20 (Rear)
- 2025 BMW Z4 255/40R18 (Front) / 275/40R18 (Rear) / 255/35R19 (Front) / 275/35R19 (Rear) / 285/30R20 (Rear)
- 2024 BMW Z4 255/40R18 (Front) / 275/40R18 (Rear) / 255/35R19 (Front) / 275/35R19 (Rear)
- 2023 BMW Z4 255/40R18 (Front) / 275/40R18 (Rear) / 255/35R19 (Front) / 275/35R19 (Rear)
- 2022 BMW Z4 255/40R18 (Front) / 275/40R18 (Rear) / 255/35R19 (Front) / 275/35R19 (Rear)
- 2021 BMW Z4 255/40R18 (Front) / 275/40R18 (Rear) / 255/35R19 (Front) / 275/35R19 (Rear)
- 2020 BMW Z4 255/40R18 (Front) / 275/40R18 (Rear) / 255/35R19 (Front) / 275/35R19 (Rear)
- 2019 BMW Z4 255/40R18 (Front) / 275/40R18 (Rear) / 255/35R19 (Front) / 275/35R19 (Rear)
- 2016 BMW Z4 225/45R17
- 2015 BMW Z4 225/45R17
How to read a tire size
A tire size like 225/45R17 breaks down into three parts:
the first number is the section width in millimeters
(the tire's width from sidewall to sidewall), the second is the
aspect ratio — the sidewall's height as a percentage of
that width — and the number after the "R" is the rim
diameter in inches. A letter prefix (P or LT) indicates
Passenger or Light Truck construction; its absence usually means
Euro-metric sizing.
Some trucks and off-road tires instead use "flotation" sizing, like
37X12.50R17 — here the numbers are the tire's overall
diameter and width in inches directly, with the rim diameter last.
Always verify against the tire information placard on your driver's-side door jamb or your owner's manual before purchasing — tire size can vary by factory option package even within the same trim.