2015 BMW X5 — M
The 2015 BMW X5 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.
285/40R20 (Front)
| Section width | 285 mm |
|---|---|
| Aspect ratio (sidewall height) | 40% (114 mm) |
| Rim diameter | 20" |
| Overall tire diameter | ~29" |
| Revolutions per mile | ~696 |
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325/35R20 (Rear)
| Section width | 325 mm |
|---|---|
| Aspect ratio (sidewall height) | 35% (113.8 mm) |
| Rim diameter | 20" |
| Overall tire diameter | ~29" |
| Revolutions per mile | ~696 |
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285/35R21 (Front)
| Section width | 285 mm |
|---|---|
| Aspect ratio (sidewall height) | 35% (99.8 mm) |
| Rim diameter | 21" |
| Overall tire diameter | ~28.9" |
| Revolutions per mile | ~699 |
Compare prices at:
325/30R21 (Rear)
| Section width | 325 mm |
|---|---|
| Aspect ratio (sidewall height) | 30% (97.5 mm) |
| Rim diameter | 21" |
| Overall tire diameter | ~28.7" |
| Revolutions per mile | ~703 |
Compare prices at:
What this size means for your BMW X5
On the 2015 BMW X5 M, the factory 285/40R20 measures about 29″ in overall diameter with a 114 mm (4.5″) sidewall, and completes roughly 696 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 large-diameter fitment.
This is a staggered setup: the front axle runs 285/40R20 and the rear runs 325/35R20. The two sizes are not interchangeable, so order each for its correct axle and don't rotate front-to-rear.
Other 2015 BMW X5 trims
- sDrive35i Base Model 255/55R18
- sDrive35i Luxury Line 255/50R19 / 275/40R20 (Front) / 315/35R20 (Rear)
- sDrive35i M Sport 255/50R19 / 275/40R20 (Front) / 315/35R20 (Rear)
- sDrive35i xLine 255/50R19 / 275/40R20 (Front) / 315/35R20 (Rear)
- xDrive35d Base Model 255/55R18
- xDrive35d Luxury Line 255/50R19 / 275/40R20 (Front) / 315/35R20 (Rear)
- xDrive35d M Sport 255/50R19 / 275/40R20 (Front) / 315/35R20 (Rear)
- xDrive35d xLine 255/50R19 / 275/40R20 (Front) / 315/35R20 (Rear)
- xDrive35i Base Model 255/55R18
- xDrive35i Luxury Line 255/50R19 / 275/40R20 (Front) / 315/35R20 (Rear)
- xDrive35i M Sport 255/50R19 / 275/40R20 (Front) / 315/35R20 (Rear)
- xDrive35i xLine 255/50R19 / 275/40R20 (Front) / 315/35R20 (Rear)
- xDrive50i Base Model 255/50R19
- xDrive50i Luxury Line 255/50R19 / 275/40R20 (Front) / 315/35R20 (Rear)
- xDrive50i M Sport 255/50R19 / 275/40R20 (Front) / 315/35R20 (Rear)
- xDrive50i xLine 255/50R19 / 275/40R20 (Front) / 315/35R20 (Rear)
BMW X5 tire sizes by year
- 2026 BMW X5 295/35R21 (Front) / 315/35R21 (Rear) / 315/30R22 (Rear)
- 2025 BMW X5 295/35R21 (Front) / 315/35R21 (Rear) / 315/30R22 (Rear)
- 2024 BMW X5 295/35R21 (Front) / 315/35R21 (Rear) / 315/30R22 (Rear)
- 2023 BMW X5 295/35R21 (Front) / 315/35R21 (Rear) / 315/30R22 (Rear)
- 2022 BMW X5 295/35R21 (Front) / 315/35R21 (Rear) / 315/30R22 (Rear)
- 2021 BMW X5 295/35R21 (Front) / 315/35R21 (Rear) / 315/30R22 (Rear)
- 2020 BMW X5 295/35R21 (Front) / 315/35R21 (Rear) / 315/30R22 (Rear)
- 2019 BMW X5 275/45R20 / 275/40R21 (Front) / 315/35R21 (Rear) / 275/35R22 (Front) / 315/30R22 (Rear)
- 2018 BMW X5 285/40R20 (Front) / 325/35R20 (Rear) / 285/35R21 (Front) / 325/30R21 (Rear)
- 2017 BMW X5 285/40R20 (Front) / 325/35R20 (Rear) / 285/35R21 (Front) / 325/30R21 (Rear)
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.