The 1974 Ford Squire belongs to the long-roof American wagon era, when full-size family cars balanced highway comfort, cargo room, and unmistakable woodgrain-era presence. Owners restoring or maintaining one today usually want a tire that looks right under a large, formal wagon body while still matching the vehicle's original fitment style. The 1974 Ford Squire uses 15-inch radial tire fitments in JR78-15 and LR78-15, so the first step is confirming which size is on the car now. That matters because available choices can differ by size, sidewall treatment, and tire construction style. A careful selection keeps the wagon's stance, appearance, and road manners aligned with its intended character.
Which Tire Size Is Right for The 1974 Ford Squire
The 1974 Ford Squire uses two primary tire sizes, both in radial construction on 15-inch rims. Because the covered wagon sub-model can use either JR78-15 or LR78-15, the key step is confirming which size is mounted on the vehicle now and making sure the wheel and overall setup match that fitment before selecting a replacement.
JR78-15 is a vintage alphanumeric radial size in which the letter identifies the tire's size class, the R marks radial construction, the 78 designates the profile family, and 15 is the wheel diameter in inches. On a 1974 Ford Squire, this size reflects a period radial fitment rather than an earlier bias-ply format. Its appeal is mainly for owners who want to stay with the proper sizing convention for the wagon's existing wheel setup. Before choosing JR78-15, confirm that the car is actually using this size and that wheel width and vehicle clearance remain appropriate.
LR78-15 is also a vintage alphanumeric radial size, with the letter identifying a larger size class, the R indicating radial construction, the 78 describing the profile family, and 15 showing the rim diameter. For the 1974 Ford Squire, this size suits wagons equipped for the larger radial fitment within the same 15-inch wheel family. Firestone offers an LR78-15 option in the Steel Belted 721 series with a narrow whitewall and a bias-profile radial presentation. That makes LR78-15 especially relevant for owners trying to balance full-size wagon appearance with a traditional period-style tire look.
Fitment for the covered 1974 Ford Squire wagon sub-model is straightforward in format but still requires a size check, because the wagon can use either JR78-15 or LR78-15. Confirming the exact tire already on the car is the simplest way to narrow the correct replacement path.
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1974 Ford Squire Wagons
The 1974 Ford Squire Wagons sub-model uses radial 15-inch tire fitments and may be equipped with either JR78-15 or LR78-15. That means tire selection starts with confirming the wagon's current size and wheel setup, then choosing the replacement that best matches the desired appearance and road-use goals.
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.
Best 1974 Ford Squire Tires for Sale
Available product choice for the 1974 Ford Squire centers on LR78-15, with a Firestone Steel Belted 721 option in the Wide Oval Radial series. It combines a narrow whitewall appearance with a bias-profile radial look, giving restoration-minded wagon owners a more traditional visual presentation to compare.
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Bias Profile Radial
Firestone Steel Belted 721 |.75 Inch Whitewall | LR78-15
These FAQs focus on 1974 Ford Squire tire size identification, 15-inch rim fitment, radial construction, product selection, period-style appearance, and the inspections worth making before putting a full-size collector wagon back on the road.
Tire Size & Fitment
What tire size fits a 1974 Ford Squire?
The 1974 Ford Squire uses two primary tire sizes: JR78-15 and LR78-15. Both are vintage alphanumeric radial sizes designed for 15-inch rims, and the covered Squire wagon sub-model can be equipped with either one depending on the vehicle's setup.
That means the right choice is not made by year and model alone. Check the size already mounted on the car, confirm the wheel diameter, and make sure the wagon has not been altered with different wheels or suspension parts before choosing a replacement tire.
What size rim does a 1974 Ford Squire use?
The 1974 Ford Squire uses 15-inch rims with its primary tire fitments. Both JR78-15 and LR78-15 are built around a 15-inch wheel diameter, so rim diameter stays consistent even though the wagon may use more than one tire size.
Rim diameter is only part of the fitment picture on a full-size wagon. Wheel width still matters, especially when comparing available products, and any aftermarket wheel change should be checked carefully so the tire size, wheel, and body clearance remain compatible.
Why does the 1974 Ford Squire have more than one tire size?
The 1974 Ford Squire can use JR78-15 or LR78-15, which means the wagon was equipped within a range of radial fitments rather than one universal size. Both use the same 15-inch rim diameter, but they represent different alphanumeric radial size classes.
For an owner, the practical step is to verify the actual wheel-and-tire combination on the car instead of assuming every Squire wagon takes the same replacement. That is especially important if the wagon has been restored before, fitted with different wheels, or carried replacement tires for many years.
Choosing the Right Tire
What should I consider when choosing a JR78-15 or LR78-15 tire for a 1974 Ford Squire?
Start with the exact size on the car, because the 1974 Ford Squire may use either JR78-15 or LR78-15. After confirming size, compare construction style, rim compatibility, sidewall appearance, and whether the tire suits the wagon's intended use as a restoration piece or a regular road car.
A large wagon can look noticeably different depending on tire proportion and sidewall treatment, so appearance matters along with fitment. It also helps to review load capacity, wheel width, and overall condition of the car's suspension and steering before deciding which available tire makes the most sense.
What sidewall styles are available for 1974 Ford Squire tires?
For the available 1974 Ford Squire product selection in LR78-15, the sidewall style offered is a narrow whitewall. That gives the wagon a traditional full-size American car appearance that suits many restoration-oriented builds without moving into a more aggressive or modern visual style.
Sidewall choice has a strong effect on how a big wagon presents from the curb. Even when the size is correct, owners often choose between tires partly on appearance, so matching the whitewall look to the vehicle's trim, paint, and restoration direction can be just as important as the basic fitment.
What brands offer tires for the 1974 Ford Squire?
Firestone is represented in the available 1974 Ford Squire product selection, specifically in LR78-15. That option appears in the Steel Belted 721 line and gives owners a branded period-style radial choice within the correct vintage sizing format for this full-size wagon application.
Brand alone should not decide the purchase on a collector wagon. Size confirmation comes first, and then the more useful comparison points are the tire's construction style, sidewall presentation, rim-width compatibility, and whether its look matches the way the Squire is being restored or driven.
Restoration & Appearance
Which tire should I choose for a period-style 1974 Ford Squire?
A period-style 1974 Ford Squire tire choice starts with the correct primary size already on the wagon, either JR78-15 or LR78-15, since both are vintage alphanumeric radial fitments. Staying within that sizing convention helps preserve the wagon's proper full-size 1970s character better than using an unrelated modern format.
Beyond size, visual details shape the final result. The available LR78-15 Firestone option combines a narrow whitewall with a bias-profile radial look, which can suit a traditional restoration theme, but exact originality should still be checked against marque references or vehicle-specific historical documentation.
How does tire construction affect the appearance of a restored 1974 Ford Squire?
Construction affects both stance and visual character on a restored 1974 Ford Squire. Since this wagon uses radial primary fitments, keeping the correct vintage radial size preserves the proper sizing language, and a bias-profile radial presentation can add a more traditional look than a purely modern tire appearance.
Sidewall treatment matters too, especially on a long-roof Ford where the tire is visually prominent. A narrow whitewall can reinforce the wagon's formal 1970s style, while the wrong construction or modern-looking replacement can change the overall impression even when the wheel diameter itself is correct.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1974 Ford Squire?
Yes, modifications can affect tire fitment on a 1974 Ford Squire. Even though the wagon's primary sizes are JR78-15 and LR78-15 on 15-inch rims, aftermarket wheels, altered wheel width, suspension changes, or ride-height changes can all influence how well a replacement tire works on the car.
A full-size wagon leaves less room for assumptions than many owners expect. Measure the existing wheel, verify the mounted tire size, and inspect for steering or fender clearance issues before replacing tires, especially if the Squire has gone through restoration work or appearance upgrades over the years.
What should I inspect before driving a 1974 Ford Squire on new tires?
Before driving a 1974 Ford Squire on new tires, inspect the wheels for correct diameter and condition, make sure the tires are inflated properly, and confirm that the suspension and steering components are in sound shape. It is also smart to check for rubbing points at the fenders and during full steering travel.
Collector wagons often sit for long periods, so the rest of the chassis deserves attention too. Look for uneven wear from old alignment issues, signs of air loss, and any cracking, bulges, or cuts on remaining spare or older tires so the whole vehicle is ready for safe road use.
How should tires on a collector 1974 Ford Squire be maintained?
Tires on a collector 1974 Ford Squire should be checked regularly for pressure, visible aging, tread condition, and sidewall damage even if the wagon is driven only occasionally. A large vintage wagon can spend long periods parked, which makes time and storage conditions almost as important as mileage.
Good maintenance also means protecting the tires from prolonged heat, sunlight, moisture, and ozone sources during storage. Periodic inspection of wheel condition, valve stems, and any signs of flat-spotting helps keep the Squire ready for road use without discovering preventable problems on the day of a drive.
