1991 Ford Bronco Bolt Pattern & Tire Size
The 1991 Ford Bronco OEM tire size, bolt pattern, and wheel specifications are listed below. All data is based on industry-standard OEM reference specifications.
The 1991 Ford Bronco has a 5x139.7 bolt pattern, an OEM tire size of 235/75R15, and a 86.9mm center bore.
Other years of the Ford Bronco
1991 Ford Bronco Engine & Trim Levels
Detailed tire and wheel breakdown for the 1991 Ford Bronco
Tire geometry â 235/75R15
The 235/75R15 fitted to the 1991 Ford Bronco has a section width of 235mm and an aspect ratio of 75%, mounted on a 15-inch rim. That gives a sidewall height of 176.3mm (6.94") and an overall outside diameter of 733.5mm (28.88"). At highway speed this tire completes roughly 434 revolutions per kilometre, which is what your speedometer and odometer are calibrated against.
Plus-sizing window
If you want to upsize wheels on the 1991 Ford Bronco while keeping the speedometer accurate, target a 245/67R16 (plus-one). For a softer ride or winter setup, a 225/84R14 (minus-one) keeps the overall diameter within Âą3% of stock, which is the industry tolerance for ABS and stability control to stay calibrated.
Wheel fitment specs
The 1991 Ford Bronco uses a 5x139.7 bolt pattern with a 86.9mm hub bore. Safe rim width range for the OEM tire is 6.5J â 7.5J, and offsets in the ET7 â ET17 window will clear suspension and fender without rubbing on most setups.
Tire pressure guidance
Manufacturer-recommended cold tire pressure for the 1991 Ford Bronco is printed on the driver-side door jamb sticker â always defer to that value, not to the maximum pressure printed on the tire sidewall. Check pressure monthly and before long trips; under-inflation by 20% can reduce tread life by 25%.
OEM Wheel & Tire Specs
Frequently Asked Questions
What tire size does the 1991 Ford Bronco XLT use?
The 1991 Ford Bronco XLT uses 235/75R15 tires as standard equipment.
What is the bolt pattern of the 1991 Ford Bronco?
The 1991 Ford Bronco has a 5x139.7 bolt pattern with a center bore of 86.9mm.
What is the wheel offset of the 1991 Ford Bronco?
The 1991 Ford Bronco has a wheel offset of ET12.
Other Vehicles with 5x139.7 Bolt Pattern
The following vehicles share the same 5x139.7 bolt pattern as the 1991 Ford Bronco, making wheel interchangeability possible (verify offset and center bore before swapping).