The 1978 Ford Fairmont arrived at an important transition point for American cars, bringing Ford’s Fox-platform packaging to buyers who wanted practical transportation in sedan, wagon, and sporty Futura form. That broad range is exactly why tire selection on a 1978 Ford Fairmont deserves careful attention. Depending on the sub-model, Fairmont fitment spans B78-14, BR78-14, C78-14, CR78-14, and DR78-14, with both bias-ply and radial constructions appearing on 14-inch rims. That gives owners a mix of period-style sizing and, for some bias-ply sizes, modern radial-equivalent paths. The key is matching the tire to the exact body and engine combination before weighing appearance, construction, and road-use priorities.
Which Tire Size Is Right for The 1978 Ford Fairmont
Five primary tire sizes are used on the 1978 Ford Fairmont, and the right choice depends on the exact sub-model. All of them fit 14-inch rims, but construction and size vary by sedan, wagon, engine, and Futura configuration. Before choosing a tire, confirm the specific Fairmont sub-model first, then decide whether a period-style bias-ply fitment or a radial setup matches the vehicle’s intended appearance and use.
B78-14 is a vintage alphanumeric bias-ply size in which the letter identifies the tire’s relative size class, the 78 identifies its profile family, and the 14 indicates a 14-inch rim. On the 1978 Ford Fairmont, this is a primary bias-ply fitment for certain 4-cylinder sedan applications and suits buyers keeping a traditional late-1970s tire presentation. A bias-ply size like B78-14 is most useful when period-style appearance and original-style construction matter more than moving to a later radial format. It should still be matched to the correct Fairmont configuration before selection.
BR78-14 uses the same vintage alphanumeric sizing pattern as a bias-ply tire, but the R in the code identifies radial construction. On the 1978 Ford Fairmont, it appears on certain 4-cylinder sedan applications as a radial-format primary fitment on a 14-inch wheel. This size appeals to owners who want the right era of tire sizing without stepping away from a radial designation. It is a useful choice when the goal is to stay within the Fairmont’s correct fitment family while confirming the car’s exact sedan and engine combination.
C78-14 is another vintage alphanumeric bias-ply size, with the letter marking a larger size class than B78-14, the 78 indicating the profile family, and the 14 showing rim diameter. On the 1978 Ford Fairmont, this size is used on certain 6-cylinder sedan models and represents the period-style bias-ply side of their fitment range. That makes it relevant for owners preserving the car’s traditional tire character rather than converting immediately to a radial alternative. Selection should stay tied to the exact 6-cylinder sedan application, not the Fairmont line as a whole.
Fit(s): 2 Dr. Sedan 6 Cyl., 4 Cyl. Wagon, 4 Dr. Sedan 6 Cyl., and 6 Cyl. Wagon
Construction: Radial|Rim: 14 in
CR78-14 is a vintage alphanumeric radial size, with the C size class, R radial construction marker, 78 profile family, and 14-inch rim designation all built into the code. It appears across several 1978 Ford Fairmont applications, including certain 6-cylinder sedans and wagon configurations, making it one of the more broadly relevant radial fitments in the range. For buyers, CR78-14 often means comparing the exact sub-model first, then deciding among correct-format radial options. It is especially useful when maintaining a proper late-1970s sizing style matters as much as simple wheel diameter.
DR78-14 is a vintage alphanumeric radial size that uses the D size class, an R for radial construction, the 78 profile family, and a 14-inch rim diameter. On the 1978 Ford Fairmont, it is used on Futura and certain wagon applications, placing it in the larger end of the Fairmont’s documented radial fitments. That gives it a distinct role from the smaller sedan sizes and makes sub-model confirmation especially important. Buyers considering DR78-14 should verify the car’s body style and wheel setup before comparing appearance and construction goals.
Tire fitment on the 1978 Ford Fairmont varies meaningfully by sub-model rather than following one size across the entire line. Checking the exact sedan, wagon, or Futura configuration is the first step, because construction and tire size both change within the Fairmont range.
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1978 Ford Fairmont 2 Dr. Sedan 4 Cyl.
The 1978 Ford Fairmont 2 Dr. Sedan 4 Cyl. uses either B78-14 bias-ply or BR78-14 radial sizing on a 14-inch rim. That makes the key decision one of construction and tire character after confirming the car matches this exact sedan and engine combination.
The 1978 Ford Fairmont 2 Dr. Sedan 6 Cyl. moves to the larger C78-14 bias-ply or CR78-14 radial fitment family. Tire selection here centers on choosing the correct size range for the 6-cylinder sedan first, then deciding whether to retain a period-style bias-ply look or stay with radial construction.
The 1978 Ford Fairmont 4 Cyl. Wagon uses radial sizes only, with CR78-14 and DR78-14 both appearing within its fitment range. That makes wheel and configuration confirmation especially important, since the wagon does not follow the same bias-ply-versus-radial pattern seen on the sedans.
The 1978 Ford Fairmont 4 Dr. Sedan 4 Cyl. shares the same fitment pattern as the 2-door 4-cylinder sedan, using B78-14 bias-ply or BR78-14 radial. Buyers should verify the exact sedan application first and then choose the construction style that best suits restoration goals and intended driving use.
The 1978 Ford Fairmont 4 Dr. Sedan 6 Cyl. uses the C78-14 and CR78-14 size family rather than the smaller 4-cylinder sedan sizes. That distinction matters when selecting tires, because a 6-cylinder sedan should be matched to its own fitment group before comparing bias-ply and radial options.
The 1978 Ford Fairmont 6 Cyl. Wagon uses radial fitments in the CR78-14 to DR78-14 range. Tire choice here starts with confirming the wagon’s exact wheel setup, then selecting the radial size that matches the vehicle’s configuration and intended presentation.
The 1978 Ford Fairmont Futura uses DR78-14, making its fitment more straightforward than the sedan combinations with both bias-ply and radial choices. The main decision becomes selecting the right tire within that radial size while keeping the car’s sporty late-1970s appearance and actual wheel setup in mind.
The 1978 Ford Fairmont V8 Wagon uses DR78-14 as its primary fitment. With the size question narrowed, the focus shifts to choosing a tire that suits the wagon’s use, appearance goals, and wheel condition rather than sorting through multiple primary size families.
Bias-Ply to Radial Tire Conversion for the 1978 Ford Fairmont
For the original B78-14 and C78-14 bias-ply sizes, three radial-equivalent options are available for each. B78-14 crosses to 155R14 as an 80-series metric radial, P175/75R14 as a 75-series P-metric radial, and P185/70R14 as a 70-series P-metric radial. C78-14 crosses to 175R14, P185/75R14, and P195/70R14 in the same sequence. These options span traditional metric, 75-series, and lower-profile 70-series radial formats, with a recommended rim-width range of 4 to 6 inches, so wheel compatibility and vehicle clearance should be checked before changing size format.
Modern Radial Equivalents
155R14
Equivalent 80-series Metric Radial (B78-14)
P175/75R14
Equivalent P-metric 75-series Radial (B78-14)
P185/70R14
Equivalent P-metric 70-series Radial (B78-14)
175R14
Equivalent 80-series Metric Radial (C78-14)
P185/75R14
Equivalent P-metric 75-series Radial (C78-14)
P195/70R14
Equivalent P-metric 70-series Radial (C78-14)
Important Considerations When Replacing Bias Ply With Radial
Compare overall diameter and section width carefully to ensure proper fit.
Verify recommended rim range (4-6 in) and load needs match your vehicle specifications.
Check fender clearance, steering clearance, and stance before installation.
Consider suspension condition and intended road use when choosing equivalents.
Important Fitment Notes
The tire sizes listed on this page assume factory-standard vehicle configuration. The following modifications may affect tire fitment and are not reflected in this guide:
Suspension changes (lowering, lift kits, spring replacements)
Body alterations (fender modifications, custom bodywork)
If your vehicle has been modified from factory specifications, verify tire clearance before purchase.
Frequently Asked Questions
Fairmont tire questions usually come down to sub-model identification, 14-inch rim fitment, late-1970s bias-ply versus radial sizing, and how to evaluate equivalent radial sizes for the bias-ply applications. The details matter because the 1978 Ford Fairmont does not use one universal tire across every body and engine combination.
Tire Size & Fitment
What tire size fits a 1978 Ford Fairmont?
The 1978 Ford Fairmont uses five primary tire sizes depending on the exact sub-model: B78-14, BR78-14, C78-14, CR78-14, and DR78-14. Sedan, wagon, engine, and Futura configurations do not all share the same fitment, and the Fairmont range includes both bias-ply and radial constructions.
The important next step is confirming the exact Fairmont body style and engine combination before choosing a tire. Once that is settled, the decision becomes much simpler: stay with the correct primary size for the car, then compare construction type, period-style appearance, and whether a radial-equivalent path is relevant for one of the bias-ply applications.
What size rim does a 1978 Ford Fairmont use?
The tire sizes used on the 1978 Ford Fairmont are all built around a 14-inch rim diameter. That includes B78-14, BR78-14, C78-14, CR78-14, and DR78-14, so wheel diameter remains consistent even though tire size and construction vary across the Fairmont lineup.
Rim diameter is only part of the fitment picture, so it should not be the only number checked. A Fairmont with replacement wheels, trim-specific wheel changes, or long-ago modifications may still need its actual wheel width and tire clearance confirmed before selecting among the different 14-inch tire sizes used across sedan, wagon, and Futura models.
Why does the 1978 Ford Fairmont have more than one tire size?
The 1978 Ford Fairmont has more than one tire size because the model line covered several body styles and engine combinations, and those configurations did not all use the same tire fitment. Some sedans use B78-14 or BR78-14, others use C78-14 or CR78-14, while Futura and certain wagons use DR78-14.
That variation means the exact sub-model matters more than the Fairmont name alone. A buyer standing in front of a wagon, Futura, or 6-cylinder sedan should confirm the car’s specific configuration first, then compare tire construction and sizing options within that fitment family instead of assuming every 1978 Fairmont uses the same tire.
Bias-Ply & Radial Options
Is B78-14 a bias-ply or radial tire for the 1978 Ford Fairmont?
B78-14 is a bias-ply tire size on the 1978 Ford Fairmont. It appears on certain 4-cylinder sedan applications, while BR78-14 is the radial-format counterpart used within that same general fitment family on a 14-inch rim.
That distinction matters because bias-ply and radial tires represent different constructions even when the sizing language looks related. Owners keeping a period-style setup may prefer to stay with the original-style B78-14 format, while anyone considering a radial alternative should also confirm wheel compatibility, ride-height changes, and clearance before changing construction.
What radial tire sizes are equivalent to B78-14 and C78-14?
B78-14 has three radial equivalents: 155R14, P175/75R14, and P185/70R14. C78-14 also has three radial equivalents: 175R14, P185/75R14, and P195/70R14. In each case, the group includes an 80-series metric radial, a 75-series P-metric radial, and a 70-series P-metric radial.
Those equivalent sizes give Fairmont owners more than one radial sizing convention to consider, but they should be treated as alternatives rather than automatic replacements. The recommended rim-width range attached to both bias-ply sizes is 4 to 6 inches, and actual wheel width, overall vehicle stance, and available clearance still deserve a careful check.
What should I check before converting my 1978 Ford Fairmont from bias-ply to radial tires?
Start by confirming which bias-ply size the car actually uses, because the 1978 Ford Fairmont does not have one universal conversion path. A B78-14 car and a C78-14 car move to different radial-equivalent size groups, and all of those choices remain tied to a 14-inch wheel.
After the size is settled, inspect wheel width, suspension condition, steering clearance, and room at the fenders. A Fairmont that has been altered over the years may respond differently than one on a stock-style setup, so the safest approach is to compare the chosen radial-equivalent size against the car’s actual wheel and body clearance before mounting tires.
Choosing the Right Tire
What should I consider when choosing a tire for a 1978 Ford Fairmont?
The first consideration is the exact Fairmont sub-model, because 1978 applications span B78-14, BR78-14, C78-14, CR78-14, and DR78-14 rather than one universal size. After that, the main choice is whether the car belongs in a bias-ply fitment family or a radial one.
From there, selection should follow the car’s purpose. A restoration-oriented sedan may call for a period-style bias-ply presentation, while a driver-focused car may push the decision toward one of the radial fitments or an equivalent radial size where applicable. Wheel condition, intended road use, and overall vehicle setup all deserve attention before making the final choice.
How do I choose between the available B78-14, BR78-14, C78-14, CR78-14, and DR78-14 tires for a 1978 Ford Fairmont?
Choose between those Fairmont tire sizes by matching the tire to the exact vehicle configuration first, not by appearance alone. B78-14 and BR78-14 belong to certain 4-cylinder sedans, C78-14 and CR78-14 belong to certain 6-cylinder sedans, and DR78-14 appears on Futura and some wagon applications.
Once the correct fitment family is established, compare the tire’s construction and the kind of presentation you want the car to have. A buyer preserving a more traditional look may stay with a bias-ply size where appropriate, while someone prioritizing a radial-format setup should remain within the proper Fairmont size range for that sub-model.
What rim-width specifications should I compare when choosing 1978 Ford Fairmont tires?
Rim width becomes especially important when looking at radial equivalents for the Fairmont’s bias-ply sizes. For both B78-14 and C78-14 radial-equivalent groups, the recommended rim-width range is 4 to 6 inches, which provides a useful checkpoint when moving away from the original bias-ply format.
That does not mean every 14-inch Fairmont wheel is automatically the same in practice, especially on a car with replacement wheels. Measuring the wheel and comparing its width to the intended tire size helps avoid a mismatch in tire profile or clearance, and it is one of the smartest checks to make before selecting an equivalent radial size.
Restoration & Appearance
Which tire should I choose for a period-style 1978 Ford Fairmont?
A period-style 1978 Ford Fairmont tire choice starts with the correct primary size for the exact sub-model, then follows the construction that suits the look you want to preserve. For certain sedan applications, that may mean staying with B78-14 or C78-14 bias-ply sizing rather than moving immediately to a radial alternative.
The visual effect of a vintage alphanumeric tire can be an important part of how a late-1970s car sits and presents itself. Buyers focused on exact historical accuracy should still compare the tire choice with marque references, original literature, or trusted restoration guidance, since period-style appearance is not the same thing as proving one exact factory-delivered tire.
How does tire construction affect the appearance of a restored 1978 Ford Fairmont?
Tire construction can change the overall visual character of a restored 1978 Ford Fairmont even when rim diameter stays at 14 inches. A bias-ply size such as B78-14 or C78-14 carries a more traditional late-1970s presentation, while BR78-14, CR78-14, and DR78-14 keep the Fairmont in a radial-format family.
That difference matters because restored cars are judged as much by stance and proportion as by parts alone. Choosing between bias-ply and radial should reflect both the sub-model’s correct fitment family and the way the finished car is meant to look on the road or at a show, rather than treating construction as a purely technical detail.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1978 Ford Fairmont?
Yes, modifications can affect tire fitment on a 1978 Ford Fairmont even though all of its primary tire sizes use a 14-inch rim. Changes such as aftermarket wheels, altered ride height, suspension replacement, or bodywork differences can influence how a B78-14, CR78-14, or DR78-14 tire sits in the wheel opening.
That is why the actual car should be checked instead of relying only on original fitment expectations. A Fairmont with non-stock wheels may need its wheel width, steering clearance, and fender room verified carefully, especially when moving between bias-ply and radial constructions or considering one of the radial-equivalent sizes tied to a bias-ply application.
What should I inspect before driving a 1978 Ford Fairmont on new tires?
Before driving a 1978 Ford Fairmont on new tires, inspect the wheels for damage or excessive corrosion, confirm the tire size matches the car’s exact sub-model, and check that the tires seat properly on the rims. It also makes sense to look over valve stems, lug hardware, and overall suspension condition.
A short road test should follow only after pressure is set correctly and there is no sign of rubbing during steering movement. On an older Fairmont, it is wise to recheck clearance after a few miles, since aging springs, prior repairs, or replacement wheels can reveal fitment issues that are not obvious while the car is standing still.
How should tires on a collector 1978 Ford Fairmont be maintained?
Collector-car tires on a 1978 Ford Fairmont should be maintained with regular pressure checks, periodic visual inspection, and careful storage habits during long stretches of non-use. Sidewall cracking, bulges, cuts, uneven wear, and slow air loss all deserve attention, even when the car is driven only occasionally.
A Fairmont that spends much of its life parked can age its tires long before the tread is worn out. Keeping the car away from prolonged sun, moisture, and ozone sources helps preserve the rubber, and occasional inspections of wheel condition and clearance are worthwhile if the car has changed hands, received replacement wheels, or sat unused for years.
