1979 Ford Fiesta Base
The 1979 Ford Fiesta Base tire size and wheel specifications below reflect standard OEM reference fitment data for this trim level.
Detailed tire and wheel breakdown for the 1979 Ford Fiesta
Tire geometry â 135/80R13
The 135/80R13 fitted to the 1979 Ford Fiesta has a section width of 135mm and an aspect ratio of 80%, mounted on a 13-inch rim. That gives a sidewall height of 108.0mm (4.25") and an overall outside diameter of 546.2mm (21.50"). At highway speed this tire completes roughly 583 revolutions per kilometre, which is what your speedometer and odometer are calibrated against.
Plus-sizing window
If you want to upsize wheels on the 1979 Ford Fiesta while keeping the speedometer accurate, target a 145/66R14 (plus-one). For a softer ride or winter setup, a 125/97R12 (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 1979 Ford Fiesta uses a 4x108 bolt pattern with a 63.4mm hub bore. Safe rim width range for the OEM tire is 4.0J â 5.0J, and offsets in the ET37 â ET47 window will clear suspension and fender without rubbing on most setups.
Tire pressure guidance
Manufacturer-recommended cold tire pressure for the 1979 Ford Fiesta 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%.
Fitment Specifications
| Engine & Trim | Tire Size | Rim Size | Offset (ET) |
|---|---|---|---|
| Base | 135/80R13 | 13" x 4.5 | ET42 |
Frequently Asked Questions
What tire size does the 1979 Ford Fiesta Base use?
The 1979 Ford Fiesta Base uses 135/80R13 tires as standard equipment.
What is the bolt pattern of the 1979 Ford Fiesta Base?
The 1979 Ford Fiesta Base has a 4x108 bolt pattern with a center bore of 63.4mm.
What is the wheel offset of the 1979 Ford Fiesta Base?
The 1979 Ford Fiesta Base has a wheel offset of ETET42.