2021 Ford Bronco — Black Diamond
The 2021 Ford Bronco Black Diamond came from the factory equipped with 265/70R17 tires. If your vehicle has since been fitted with aftermarket or upsized wheels, your actual tire size may no longer match this factory spec — always confirm against your door placard before buying.
265/70R17
| Section width | 265 mm |
|---|---|
| Aspect ratio (sidewall height) | 70% (185.5 mm) |
| Rim diameter | 17" |
| Overall tire diameter | ~31.6" |
| Revolutions per mile | ~638 |
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What this size means for your Ford Bronco
On the 2021 Ford Bronco Black Diamond, the factory 265/70R17 measures about 31.6″ in overall diameter with a 185.5 mm (7.3″) sidewall, and completes roughly 638 revolutions per mile. Its 70-series aspect ratio gives a tall sidewall of the kind used on trucks, SUVs, and older passenger cars, built for cushioning and load. In tire terms it is a passenger (P-metric / Euro-metric) size.
Other 2021 Ford Bronco trims
- Badlands 285/70R17
- Base 255/70R16
- Big Bend 255/75R17
- First Edition 315/70R17
- Outer Banks 255/70R18
- Sasquatch Package 315/70R17
- Wildtrak 315/70R17
Ford Bronco tire sizes by year
- 2026 Ford Bronco 285/70R17
- 2025 Ford Bronco 285/70R17
- 2024 Ford Bronco 285/70R17
- 2023 Ford Bronco 285/70R17
- 2022 Ford Bronco 285/70R17
- 1996 Ford Bronco 235/75R15 / 265/75R15
- 1995 Ford Bronco 235/75R15 / 265/75R15
- 1994 Ford Bronco 235/75R15 / 31X10.50R15
- 1993 Ford Bronco 235/75R15 / 31X10.50R15
- 1992 Ford Bronco 235/75R15 / 31X10.50R15
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.