Tire fitment
The 2021-2025 Ford Bronco base tire size is 255/75R17 — 255 mm wide with a 75% aspect ratio on 17″ rims. 5 OEM sizes are available across trims.
2021-2025 Ford Bronco
255/75R1732.1″ overall diameter · 191.3 mm sidewall · ~629 rev/mi
| Trim | Tire size | Rim | Diameter | vs Base |
|---|---|---|---|---|
| Big Bend ★ | 255/75R17 | 8×17″ | 32.1″ (814.3 mm) | — |
| Black Diamond | 265/70R17 | 8×17″ | 31.6″ (802.8 mm) | -1.41% |
| Outer Banks | 255/70R18 | 8×18″ | 32.1″ (814.2 mm) | -0.01% |
| Badlands | 285/70R17 | 8×17″ | 32.7″ (830.8 mm) | +2.03% |
| Wildtrak | 315/70R17 | 8.5×17″ | 34.4″ (872.8 mm) | +7.18% |
35-inch. Raptor uses 37-inch (37x12.50R17).
The 2021-2025 Ford Bronco ships with 255/75R17 tires on the base trim — that's an overall diameter of 32.1″. The 255 mm width and 75% sidewall ratio give you 191.3 mm of sidewall cushion between the rim and the road.
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 2021-2025 Ford Bronco; verify against your door-jamb placard or owner's manual.
The base 2021-2025 Ford Bronco uses 255/75R17 tires — 255 mm wide, 75% aspect ratio, on 17-inch rims. The overall diameter is 32.1″ (814.3 mm). Higher trims use different sizes — see the table above. Confirm against your door-jamb placard.
Yes, within limits. Keep the overall diameter within about 3% of 32.1″ to avoid speedometer error and clearance issues. A wider tire may improve grip, but match the load and speed ratings your Bronco requires.
255/75R17 tires have an overall diameter of 32.1″ (814.3 mm), with a 191.3 mm sidewall height. That's about 629 revolutions per mile.
The 2021-2025 Ford Bronco 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.