The 1979 Dodge D100 Pickup came from a period when half-ton pickups were expected to handle real work while still serving as everyday transportation. In this era, Dodge trucks balanced utility with increasingly car-like road manners, which makes correct tire selection especially important today. The 1979 Dodge D100 Pickup uses 15-inch vintage alphanumeric radial sizes, with FR78-15, HR78-15, and LR78-15 fitments tied to specific GVWR-based 4x2 configurations. That means the decision is less about broad truck tire shopping and more about matching the right size to the truck's rating, stance, and intended use. Owners keeping a stock-style look should also pay close attention to sidewall appearance and overall tire profile.
Which Tire Size Is Right for The 1979 Dodge D100 Pickup
Three primary tire sizes apply to the 1979 Dodge D100 Pickup, and the correct one depends on the truck's specific 4x2 GVWR configuration rather than on a simple one-size-fits-all approach. All three are vintage alphanumeric radial sizes for 15-inch rims, so the first step is confirming which sub-model the truck is, then matching that size to the wheel setup already on the vehicle.
FR78-15 is a vintage alphanumeric radial size in which the letter identifies the size class, the 78 indicates the profile family, and the 15 designates a 15-inch rim. On the 1979 Dodge D100 Pickup, this size belongs to a specific 4x2 GVWR application rather than to every version of the truck. It represents a period-style radial fitment for owners who want to stay within the original sizing language used on late-1970s pickups. Choosing FR78-15 starts with confirming that exact truck configuration and then checking that the wheels still match the intended rim diameter and overall setup.
HR78-15 is another vintage alphanumeric radial size, using the same 78-series format with a different letter code to indicate a different size class. This size appears across more than one 1979 Dodge D100 Pickup 4x2 GVWR configuration, making it a key fitment for trucks that fall between the lighter and heavier-rated versions. Its radial construction suits the late-1970s truck transition away from earlier bias-ply conventions while preserving a period-appropriate sizing format. Buyers considering HR78-15 should verify the truck's GVWR classification and confirm that any wheel or suspension changes have not altered the fitment requirements.
LR78-15 uses the same vintage alphanumeric radial system, with the larger letter class indicating a heavier-duty size within the 78-series family and a 15-inch rim diameter. For the 1979 Dodge D100 Pickup, this size is associated with the higher-GVWR 4x2 configurations and is also the size with an available Firestone option in a Bias Look Radial construction. That product combines a traditional truck-tire profile with a narrow whitewall presentation under the Wide Oval Radial series. LR78-15 deserves extra attention from owners who want the correct heavier-duty size while also considering appearance, rim-width compatibility, and load capability.
Sub-model fitment matters on the 1979 Dodge D100 Pickup because tire size changes with the truck's 4x2 GVWR classification. Before choosing a tire, confirm whether the truck is the 4800, 5500, or 6000 GVWR version so the correct 15-inch radial size can be matched to the vehicle.
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1979 Dodge D100 Pickup 4x2 (GVWR 4800)
The 1979 Dodge D100 Pickup 4x2 (GVWR 4800) uses FR78-15 or HR78-15 radial sizing, so selection starts by confirming which wheel and tire setup is already on the truck. That makes this sub-model a fitment-check exercise first, followed by a decision about preserving a period-style radial presentation.
The 1979 Dodge D100 Pickup 4x2 (GVWR 5500) falls between the lighter and heavier versions, using either HR78-15 or LR78-15 radial sizing. Buyers should verify the installed wheel-and-tire combination carefully, especially on trucks that may have seen work use, wheel swaps, or later replacement tires.
The 1979 Dodge D100 Pickup 4x2 (GVWR 6000) uses LR78-15, making fitment more straightforward than on the lower-rated versions. Tire choice then shifts toward selecting the right construction style, appearance, and wheel compatibility for a heavier-duty 15-inch truck setup.
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 1979 Dodge D100 Pickup Tires for Sale
Available product choice for the 1979 Dodge D100 Pickup centers on LR78-15, with a Firestone Wide Oval Radial option in Bias Look Radial construction and a narrow whitewall sidewall treatment. That gives higher-GVWR trucks a restoration-oriented appearance choice while keeping attention on correct 15-inch rim compatibility.
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Bias Profile Radial
Firestone Steel Belted 721 |.75 Inch Whitewall | LR78-15
These FAQs focus on the tire sizes used on the 1979 Dodge D100 Pickup, how GVWR affects fitment, and what to check when comparing radial construction, appearance, wheel setup, and road-use readiness.
Tire Size & Fitment
What tire size fits a 1979 Dodge D100 Pickup?
The 1979 Dodge D100 Pickup uses three possible tire sizes: FR78-15, HR78-15, and LR78-15. All are vintage alphanumeric radial sizes on 15-inch rims, but they do not apply to every truck equally. The correct fitment depends on the specific 4x2 GVWR version, with lighter and heavier-rated trucks using different size combinations.
Choosing the right one starts with identifying whether the truck is the 4800, 5500, or 6000 GVWR model. After that, confirm the wheel diameter already on the vehicle and inspect for changes from original-style wheels, suspension modifications, or long-ago replacement tires that may have altered what is currently installed.
What size rim does a 1979 Dodge D100 Pickup use?
The tire fitments used on the 1979 Dodge D100 Pickup are built around a 15-inch rim diameter. FR78-15, HR78-15, and LR78-15 all share that same wheel diameter, which simplifies one part of the fitment decision even though the correct tire size still varies by GVWR-based sub-model.
That common 15-inch rim diameter does not mean every 15-inch wheel is automatically suitable. Wheel width, overall condition, and any aftermarket wheel changes still matter, especially on older trucks that may have had working lives. Measuring the wheel and matching it to the tire's intended application is the smart next step.
Do all 1979 Dodge D100 Pickup sub-models use the same tire size?
No. The 1979 Dodge D100 Pickup uses different tire sizes across its 4x2 sub-models. The 4800 GVWR truck uses FR78-15 or HR78-15, the 5500 GVWR truck uses HR78-15 or LR78-15, and the 6000 GVWR truck uses LR78-15. Tire size on this truck is tied directly to the specific weight-rating configuration.
That variation matters because two trucks that look similar from the outside may not share the same correct tire size. Before ordering or comparing products, confirm the truck's exact GVWR version and then verify the wheel setup on the vehicle today, since many vintage pickups have seen replacement wheels over the years.
Bias-Ply & Radial Options
Is LR78-15 a bias-ply or radial tire for the 1979 Dodge D100 Pickup?
LR78-15 is a radial tire size for the 1979 Dodge D100 Pickup. The primary vehicle fitment is an alphanumeric radial on a 15-inch rim. One available LR78-15 product uses Bias Look Radial construction, which means it is still a radial tire but styled to echo the profile and visual character of an earlier bias-ply truck tire.
That distinction is useful for owners who want radial construction while preserving a more traditional late-1970s or earlier-looking presentation. Construction style and appearance should be considered alongside wheel compatibility, load capacity, and the truck's actual use, especially on higher-GVWR applications where the size itself is part of the fitment decision.
Should I use bias-ply or radial tires on a 1979 Dodge D100 Pickup?
The primary tire fitments for the 1979 Dodge D100 Pickup are radial sizes: FR78-15, HR78-15, and LR78-15. For this truck, the main decision is not between original bias-ply sizing and modern radial conversion, but between the correct radial size for the sub-model and the type of radial presentation you want, including a bias-look radial in LR78-15.
Owners focused on a stock-style truck appearance may appreciate a more traditional profile, while others may simply want the proper alphanumeric radial size for the truck's GVWR classification. Since the D100 can have different fitments across sub-models, size confirmation comes first, followed by wheel condition, width compatibility, and overall clearance checks.
Can I use a bias-look radial on a 1979 Dodge D100 Pickup?
A bias-look radial is available for the 1979 Dodge D100 Pickup in LR78-15. That makes it relevant to the higher-GVWR 4x2 applications that use LR78-15 as a primary size. It offers radial construction with a more traditional tire profile and appearance, rather than converting the truck to an unrelated modern metric size.
This can be a useful option for an owner who wants a vintage truck presentation without leaving the radial category. The truck still needs to be checked for the correct LR78-15 application, and the wheel setup should match the tire's intended rim requirements before making the switch from whatever is currently installed.
Choosing the Right Tire
What should I consider when choosing a tire for a 1979 Dodge D100 Pickup?
Start with the correct primary size for the truck's 4x2 GVWR classification, since the 1979 Dodge D100 Pickup can use FR78-15, HR78-15, or LR78-15. From there, focus on radial construction, wheel compatibility, and whether the truck is being kept in a stock-style presentation or used more as a regular road-going vintage pickup.
Appearance and specification details matter once size is settled. An LR78-15 buyer, for example, may compare a bias-look radial profile, narrow whitewall styling, rim-width range, and load capacity. The smartest choice is the one that matches the truck's exact fitment, visual goals, and the condition of the wheels already on the vehicle.
What sidewall styles are available for 1979 Dodge D100 Pickup tires?
The available sidewall style for the 1979 Dodge D100 Pickup product offering is a narrow whitewall in LR78-15. That gives owners of trucks using the larger LR78-15 size a traditional sidewall treatment that can complement a restoration-oriented build or a period-style driver without moving away from the proper alphanumeric radial format.
Sidewall style should come after the fitment decision, not before it. A truck that uses FR78-15 or HR78-15 still needs the correct size first, while an LR78-15 truck can then weigh whether a narrow whitewall suits the desired look. Matching tire appearance to wheel style and overall truck presentation usually produces the most cohesive result.
What brands offer tires for the 1979 Dodge D100 Pickup?
Firestone is represented in the available product selection for the 1979 Dodge D100 Pickup, specifically in LR78-15. That option is part of the Wide Oval Radial series and uses Bias Look Radial construction, which gives owners of applicable trucks a recognizable brand choice within the correct vintage-style truck sizing format.
Brand is only one part of the selection process on this truck. The larger issue is choosing the right size for the correct GVWR-based sub-model, then confirming wheel fit and deciding whether the truck needs a more traditional-looking radial presentation. On a vintage pickup, proper fitment always matters more than brand preference alone.
Restoration & Appearance
Which tire should I choose for a period-style 1979 Dodge D100 Pickup?
A period-style 1979 Dodge D100 Pickup should begin with the correct alphanumeric radial size for its exact 4x2 GVWR classification: FR78-15, HR78-15, or LR78-15. That preserves the truck's late-1970s sizing language and keeps the visual proportions closer to what buyers expect from a Dodge pickup of this era.
For trucks that use LR78-15, a bias-look radial can add an even more traditional presentation while remaining in radial construction. Owners pursuing strict originality should still compare any final appearance choice against truck-specific historical references, since size format and period style are not the same thing as proving an exact factory-delivered tire detail.
How does tire construction affect the appearance of a restored 1979 Dodge D100 Pickup?
On a restored 1979 Dodge D100 Pickup, tire construction can influence sidewall shape, profile, and the truck's overall visual stance. Since this truck's primary fitments are radial sizes, staying within FR78-15, HR78-15, or LR78-15 keeps the sizing presentation appropriate to the period, while a bias-look radial can push the appearance in a more traditional direction.
That visual difference matters most when the truck is being restored with close attention to era-specific proportions rather than simply kept running. Sidewall treatment also plays a role, especially where a narrow whitewall is available. The best result usually comes from matching tire size, construction style, and wheel appearance as a complete package.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1979 Dodge D100 Pickup?
Yes. Modifications can affect tire fitment on a 1979 Dodge D100 Pickup even when the truck still uses a 15-inch wheel. Aftermarket wheels, changed wheel widths, suspension alterations, ride-height changes, or body work can all influence how FR78-15, HR78-15, or LR78-15 sits in the wheel opening and clears steering components.
A modified truck should be checked as an individual setup rather than assumed to match stock specifications. Measuring the installed wheels, turning the steering through full travel, and checking fender and suspension clearance are sensible steps before committing to a replacement tire, especially on trucks that have changed hands multiple times.
What should I inspect before driving a 1979 Dodge D100 Pickup on new tires?
Before putting a 1979 Dodge D100 Pickup into regular road use on new tires, inspect the wheels for damage or corrosion, confirm lug hardware condition, and make sure the tire size matches the truck's actual GVWR-based fitment. It also helps to check alignment-related wear issues, brake condition, and whether the suspension is stable and free of obvious problems.
A sound tire installation works best when the rest of the truck is equally ready for the road. After mounting, verify inflation, watch for any air loss, and look for clearance concerns at full steering lock or under load. A short shakedown drive followed by a second inspection is a smart habit on older trucks.
How should tires on a collector 1979 Dodge D100 Pickup be maintained?
Tires on a collector 1979 Dodge D100 Pickup should be maintained with regular pressure checks, visual inspection, and careful storage habits. Even a lightly driven vintage truck can develop issues from age, sunlight, prolonged sitting, or slow air loss. Sidewall cracking, bulges, cuts, and uneven tread wear deserve attention before the truck returns to road use.
Storage conditions matter almost as much as mileage on an older pickup. Keeping the truck away from prolonged heat, direct sunlight, moisture, and ozone-producing equipment helps preserve the tires. It is also wise to inspect the wheels and valve stems periodically, since long-term storage can hide problems until the truck is driven again.
