2021 BMW X5: the quick answer
The 2021 BMW X5 ships with 275/45R20 tires on the base trim — that's an overall diameter of 29.7″. The 275 mm width and 45% sidewall ratio give you 123.8 mm of sidewall cushion between the rim and the road.
Tire fitment
2021 BMW X5 tire size
The 2021 BMW X5 base tire size is 275/45R20 — 275 mm wide with a 45% aspect ratio on 20″ rims. 3 OEM sizes are available across trims.
2021 BMW X5
275/45R2029.7″ overall diameter · 123.8 mm sidewall · ~678 rev/mi
| Trim | Tire size | Rim | Diameter | vs Base |
|---|---|---|---|---|
| xDrive40i/M60i ★ | 275/45R20 | 9×20″ | 29.7″ (755.5 mm) | — |
| optional (front) | 275/40R21 | 9.5×21″ | 29.7″ (753.4 mm) | -0.28% |
| optional (rear) | 315/35R21 | 10.5×21″ | 29.7″ (753.9 mm) | -0.21% |
Staggered: 275/40R21 front, 315/35R21 rear.
Before you buy tires
Match the load index and speed rating from your door-jamb placard — not just the size. If you're switching sizes, keep the overall diameter within ~3% to avoid speedometer error and potential ABS/traction-control issues.
Factory fitment for the 2021 BMW X5; verify against your door-jamb placard or owner's manual.
FAQ
What tire size does the 2021 BMW X5 use?
The base 2021 BMW X5 uses 275/45R20 tires — 275 mm wide, 45% aspect ratio, on 20-inch rims. The overall diameter is 29.7″ (755.5 mm). Higher trims use different sizes — see the table above. Confirm against your door-jamb placard.
Can I use a different tire size on my 2021 X5?
Yes, within limits. Keep the overall diameter within about 3% of 29.7″ to avoid speedometer error and clearance issues. A wider tire may improve grip, but match the load and speed ratings your X5 requires.
What is the overall diameter of 275/45R20 tires?
275/45R20 tires have an overall diameter of 29.7″ (755.5 mm), with a 123.8 mm sidewall height. That's about 678 revolutions per mile.
The 2021 BMW X5 tire sizes shown are OEM factory fitments. Confirm your exact tire size, load rating, and speed rating against the door-jamb placard or owner's manual before buying tires.