2026 BMW X7 — xDrive40i
The 2026 BMW X7 xDrive40i shipped with 5 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.
285/45R21
| Section width | 285 mm |
|---|---|
| Aspect ratio (sidewall height) | 45% (128.3 mm) |
| Rim diameter | 21" |
| Overall tire diameter | ~31.1" |
| Revolutions per mile | ~649 |
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275/40R22 (Front)
| Section width | 275 mm |
|---|---|
| Aspect ratio (sidewall height) | 40% (110 mm) |
| Rim diameter | 22" |
| Overall tire diameter | ~30.7" |
| Revolutions per mile | ~658 |
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315/35R22 (Rear)
| Section width | 315 mm |
|---|---|
| Aspect ratio (sidewall height) | 35% (110.3 mm) |
| Rim diameter | 22" |
| Overall tire diameter | ~30.7" |
| Revolutions per mile | ~657 |
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275/35R23 (Front)
| Section width | 275 mm |
|---|---|
| Aspect ratio (sidewall height) | 35% (96.3 mm) |
| Rim diameter | 23" |
| Overall tire diameter | ~30.6" |
| Revolutions per mile | ~660 |
Compare prices at:
315/30R23 (Rear)
| Section width | 315 mm |
|---|---|
| Aspect ratio (sidewall height) | 30% (94.5 mm) |
| Rim diameter | 23" |
| Overall tire diameter | ~30.4" |
| Revolutions per mile | ~663 |
Compare prices at:
What this size means for your BMW X7
On the 2026 BMW X7 xDrive40i, the factory 285/45R21 measures about 31.1″ in overall diameter with a 128.3 mm (5.1″) sidewall, and completes roughly 649 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.
The 285/45R21 and 275/40R22 differ in both width and overall diameter (0.4″, 1.3%), which usually means a staggered front/rear setup — the two sizes are not interchangeable side to side, so match each to its correct axle.
Other 2026 BMW X7 trims
BMW X7 tire sizes by year
- 2025 BMW X7 285/45R21 / 275/40R22 (Front) / 315/35R22 (Rear) / 275/35R23 (Front) / 315/30R23 (Rear)
- 2024 BMW X7 285/45R21 / 275/40R22 (Front) / 315/35R22 (Rear) / 275/35R23 (Front) / 315/30R23 (Rear)
- 2023 BMW X7 285/45R21 / 275/40R22 (Front) / 315/35R22 (Rear) / 275/35R23 (Front) / 315/30R23 (Rear)
- 2022 BMW X7 285/45R21 / 275/40R22 (Front) / 315/35R22 (Rear)
- 2021 BMW X7 285/45R21 / 275/40R22 (Front) / 315/35R22 (Rear)
- 2020 BMW X7 285/45R21 / 275/40R22 (Front) / 315/35R22 (Rear)
- 2019 BMW X7 285/45R21 / 275/40R22 (Front) / 315/35R22 (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.