2024 BMW X3 — M
The 2024 BMW X3 M 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.
255/45R20 (Front)
| Section width | 255 mm |
|---|---|
| Aspect ratio (sidewall height) | 45% (114.8 mm) |
| Rim diameter | 20" |
| Overall tire diameter | ~29" |
| Revolutions per mile | ~695 |
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265/45R20 (Rear)
| Section width | 265 mm |
|---|---|
| Aspect ratio (sidewall height) | 45% (119.3 mm) |
| Rim diameter | 20" |
| Overall tire diameter | ~29.4" |
| Revolutions per mile | ~686 |
Compare prices at:
255/40R21 (Front)
| Section width | 255 mm |
|---|---|
| Aspect ratio (sidewall height) | 40% (102 mm) |
| Rim diameter | 21" |
| Overall tire diameter | ~29" |
| Revolutions per mile | ~695 |
Compare prices at:
265/40R21 (Rear)
| Section width | 265 mm |
|---|---|
| Aspect ratio (sidewall height) | 40% (106 mm) |
| Rim diameter | 21" |
| Overall tire diameter | ~29.3" |
| Revolutions per mile | ~687 |
Compare prices at:
What this size means for your BMW X3
On the 2024 BMW X3 M, the factory 255/45R20 measures about 29″ in overall diameter with a 114.8 mm (4.5″) sidewall, and completes roughly 695 revolutions per mile. Its 45-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 large-diameter fitment.
This is a staggered setup: the front axle runs 255/45R20 and the rear runs 265/45R20. The two sizes are not interchangeable, so order each for its correct axle and don't rotate front-to-rear.
Other 2024 BMW X3 trims
- M Competition 255/40R21 (Front) / 265/40R21 (Rear)
- M40i 245/50R19 / 245/45R20 (Front) / 275/40R20 (Rear) / 245/40R21 (Front) / 275/35R21 (Rear)
- sDrive30i 245/50R19 / 245/45R20 (Front) / 275/40R20 (Rear) / 245/40R21 (Front) / 275/35R21 (Rear)
- sDrive30i M Sport 245/50R19 / 245/45R20 (Front) / 275/40R20 (Rear) / 245/40R21 (Front) / 275/35R21 (Rear)
- xDrive30i 245/50R19 / 245/45R20 (Front) / 275/40R20 (Rear) / 245/40R21 (Front) / 275/35R21 (Rear)
- xDrive30i M Sport 245/50R19 / 245/45R20 (Front) / 275/40R20 (Rear) / 245/40R21 (Front) / 275/35R21 (Rear)
BMW X3 tire sizes by year
- 2026 BMW X3 245/50R19 / 255/45R20 (Front) / 285/40R20 (Rear) / 255/40R21 (Front) / 285/35R21 (Rear)
- 2025 BMW X3 245/50R19 / 255/45R20 (Front) / 285/40R20 (Rear) / 255/40R21 (Front) / 285/35R21 (Rear)
- 2023 BMW X3 255/45R20 (Front) / 265/45R20 (Rear) / 255/40R21 (Front) / 265/40R21 (Rear)
- 2022 BMW X3 255/45R20 (Front) / 265/45R20 (Rear) / 255/40R21 (Front) / 265/40R21 (Rear)
- 2021 BMW X3 255/45R20 (Front) / 265/45R20 (Rear) / 255/40R21 (Front) / 265/40R21 (Rear)
- 2020 BMW X3 255/45R20 (Front) / 265/45R20 (Rear) / 255/40R21 (Front) / 265/40R21 (Rear)
- 2019 BMW X3 245/50R19 / 245/45R20 (Front) / 275/40R20 (Rear) / 245/40R21 (Front) / 275/35R21 (Rear)
- 2018 BMW X3 245/50R19 / 245/45R20 (Front) / 275/40R20 (Rear) / 245/40R21 (Front) / 275/35R21 (Rear)
- 2017 BMW X3 245/50R18 / 245/45R19
- 2016 BMW X3 245/50R18 / 245/45R19
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.