1979 Subaru Tire Fitment Guide

1979 Subaru vehicles use two tire sizes across the DL and GL model range: 155R13 and 6.15-13. Both sizes fit both models, and both mount on 13-inch wheels. The radial 155R13 has a confirmed rim width range of 4.00 to 5.50 inches from the available products, while the bias-ply 6.15-13 remains part of the same 13-inch fitment family.

That means the first question is not whether a DL and GL take different tire diameters, because they do not here. The practical choice is whether you want the radial size for a more modern road-going character or the numeric bias-ply size for a more period-authentic presentation. Verifying the wheel's actual width before ordering is still wise, especially if the car has changed hands or has had wheels swapped over the years.

On a 1979 Subaru, 6.15-13 is a numeric bias-ply tire size. The 6.15 figure refers to the nominal section width in inches, and the 13 identifies the wheel diameter in inches. Unlike a modern metric radial code, this older format does not spell out an aspect ratio in the way current tire sizing does, and the construction style is bias-ply rather than radial.

That matters because a 6.15-13 is not just another way of writing 155R13. It represents a different construction tradition and a different driving character, even though both sizes belong to the same 13-inch wheel family for 1979 Subaru DL and GL models. Owners restoring a car to an earlier visual standard often gravitate toward the numeric bias-ply format, while owners focused on broader routine road use often compare it against the radial alternative.

Yes. Both the 1979 Subaru DL and 1979 Subaru GL use the same two tire sizes: 155R13 and 6.15-13. There is no split here where one model uses a separate wheel diameter or a unique model-only fitment, so the tire conversation is shared across the full 1979 Subaru passenger-car lineup covered on this page.

That gives owners a simpler starting point than many larger model-year ranges. Once you know you have a 1979 Subaru DL or GL, the next decision becomes style and use case rather than basic compatibility: radial for a later-period driving experience or bias-ply for period look and feel. If your car is being judged or restored to a particular market presentation, that is when the construction and sidewall details become more important than the model badge itself.

For a 1979 Subaru, 155R13 is the radial option and 6.15-13 is the bias-ply option, and both fit the DL and GL. The radial size is the more modern construction, while the numeric size preserves the older bias-ply format that looks and behaves more like an original-era tire choice. Because both use a 13-inch rim diameter, this decision is mainly about construction and intended use rather than a different wheel size.

Owners who want a period-correct visual presentation often lean toward 6.15-13, especially on a car restored with authenticity in mind. Owners planning more frequent road use often start with 155R13 because it keeps the fitment in the correct family while using radial construction. The best approach is to decide whether your Subaru is being restored for originality, enjoyed as a casual driver, or used for a mix of both.

The available 155R13 products for 1979 Subaru are Blackwall radials from Michelin and Dunlop. That sidewall presentation suits the compact import character of a late-1970s Subaru and keeps the look clean and restrained. No alternate whitewall or decorative sidewall treatment appears in the current 155R13 offerings covered here.

For many 1979 Subaru owners, Blackwall is the natural visual direction because it aligns with the understated appearance these cars carried when new. If your goal is a factory-like road-car presentation, sidewall styling can matter almost as much as construction choice. Once you have settled on radial versus bias-ply, sidewall appearance becomes the next detail that helps the finished car look right rather than merely fit correctly.

Michelin and Dunlop both offer 155R13 radial tires for 1979 Subaru vehicles. Michelin appears in the XAS family, while Dunlop appears in the SP Sport Aquajet line. Both brands carry long-standing European and import-car associations that make sense on a small late-1970s Subaru fitment.

Brand choice in this size is less about changing the basic fitment than about choosing the product character you want around that fitment. Some owners prefer a tire family with strong period recognition, while others focus on sidewall presentation or the exact service description on the tire itself. After confirming 155R13 is your intended size, compare the individual product markings and construction details rather than assuming two same-size tires are interchangeable in every respect.

For 1979 Subaru vehicles, the available 155R13 radial products fit 13-inch wheels with a rim width range of 4.00 to 5.50 inches. That gives a clear working range for the radial option used on both DL and GL models. The shared 13-inch wheel diameter also confirms that this Subaru fitment family is centered on small-width compact-car wheels rather than a broader domestic-style wheel package.

Rim width matters because the right diameter alone does not guarantee that the tire will sit and perform as intended. Before mounting a 155R13, verify the actual wheel width on the car rather than relying only on memory or a previous owner's description. If you are comparing the bias-ply alternative, use the wheel itself as your reference point and confirm that your chosen tire matches the intended wheel dimensions and overall restoration plan.

Inner tube requirements on 1979 Subaru tires depend on the exact product. Within the 155R13 radial size, one tire is marked TL, which indicates tubeless construction, while another uses a different sidewall marking format that should be checked directly before installation. That means tube use is not something to assume across the entire 155R13 size as a category.

The wheel itself also plays a role, especially on an older car where original rims, replacement rims, or wheel condition may affect the final setup. If your Subaru still wears original wheels, inspect the rim condition and valve stem area carefully before deciding on a tubeless installation. Confirming the exact sidewall marking on the tire you choose is the cleanest way to avoid setup mistakes and to match the installation to the wheel's actual condition.

Yes, both tire sizes used on 1979 Subaru DL and GL models are built around a 13-inch wheel diameter. That means the original 13-inch wheels can often remain in service whether you choose 155R13 radial tires or 6.15-13 bias-ply tires. The shared diameter is the key point that makes these two fitments comparable within the same year and make.

Wheel diameter compatibility does not automatically settle every mounting detail, especially on a collector car with unknown wheel history. The smart next step is to confirm the actual wheel width and overall wheel condition before final tire selection. That is particularly important if the car has aftermarket wheels, mixed wheels, or wheels that may have been refinished or repaired over time.

A 1979 Subaru should be stored away from direct sunlight, electric motors, battery chargers, furnaces, and other ozone-producing sources that accelerate sidewall aging. Keep the car on a dry surface, maintain inflation, and move it periodically so the tires do not sit in one loaded position for months at a time. If you are running bias-ply tires, they are generally more prone to temporary flat-spotting during long static storage than radial tires.

Good storage habits matter more on a lightly used collector Subaru than high annual mileage does. If the car will sit for an extended season, consider using tire cradles or supporting the vehicle in a way that reduces prolonged stress on one contact patch, while following safe storage practice for the suspension. Even a modest compact car benefits from controlled storage conditions, because age and environment usually affect collector tires more than wear alone.

Tires on a 1979 Subaru should be judged primarily by age and condition rather than mileage alone. A sound rule for collector vehicles is to begin close inspection around the five- to seven-year point and to treat about ten years as a serious replacement threshold even if tread remains. The DOT date code, sidewall condition, air retention, and any signs of separation matter far more than how few miles the car has covered.

Many vintage Subarus see limited seasonal use, so owners can be misled by a tire that still looks acceptable at a glance. Rubber hardens over time, and a compact car that feels light and easy around town can still place real demands on an aging tire at speed or under braking. If the age is unclear, use the date code and a hands-on inspection to decide whether continued service makes sense.

Tires on a 1979 Subaru should be inspected before every drive and again before any extended outing. Look for sidewall cracking, cuts, bulges, irregular tread wear, objects in the tread, and any loss of pressure since the last use. On cars using tube-type assemblies, valve stems and any signs of tube-related leakage deserve the same attention as the tire casing itself.

That routine is especially important on an older Subaru because small, lightly driven cars can go long stretches between outings and still develop age-related tire problems. A quick visual check is not enough if the car has been sitting, exposed to temperature swings, or parked on damp surfaces. A few minutes spent checking pressure and condition before departure can prevent the most common vintage-tire failures from spoiling a drive.

A 1979 Subaru DL would have belonged to an era when small imported cars commonly transitioned through both traditional bias-ply and radial fitment language, but radial technology was already well established by the late 1970s. For the 1979 Subaru range here, both 155R13 radial and 6.15-13 bias-ply sizes are associated with the DL and GL. That gives restorers a size family that supports either a later-1970s road-car presentation or a more traditional construction approach.

Original-market fitment could vary by market, trim presentation, and how a car was delivered, so a serious restoration should be checked against factory literature, survivor cars, and Subaru marque sources. Construction type matters as much as the size code when authenticity is the goal. If you are building a car for judging rather than general enjoyment, confirm what your specific car should wear before treating any one size as the only historically correct answer.

Yes, correct tire fitment matters when a 1979 Subaru is judged for originality. Size, construction type, and sidewall appearance all affect whether the car looks right for its era, and judges often notice a modern-looking replacement even when the wheel diameter is correct. On a late-1970s import, details such as a plain Blackwall presentation and the proper style of size marking can influence how authentic the finished car appears.

That does not mean every show uses the same standard. Some events reward drivability and presentation more than strict factory detail, while marque-focused judging may be far more particular about radial versus bias-ply construction or about period-correct sidewall appearance. Before finalizing a show car, compare your intended tire choice against the event's rules and consult Subaru club resources so your tire decision supports the level of authenticity you want.

A restored 1979 Subaru can reasonably point in either direction depending on the restoration goal, because both 6.15-13 bias-ply and 155R13 radial sizes belong to the year and make. Bias-ply construction better preserves an earlier visual and road-feel character, while radial construction reflects the late-1970s shift toward more modern passenger-car tire behavior. The right answer depends on whether your restoration is being judged for strict authenticity or prepared for regular road use.

If the car is a display-focused restoration, many owners choose the construction that best matches the period image they want to present. If the car will spend more time being driven than displayed, a radial often becomes the more natural path while staying within the correct 13-inch fitment family. Deciding that intent first keeps the project coherent and avoids treating tire choice as an afterthought at the end of the restoration.

1979 Subaru tires can be suitable for highway driving when they are in good condition, correctly mounted, and used within their design limits. The available 155R13 radial products carry H-speed ratings, which correspond to a 130 mph ceiling, far beyond ordinary highway speeds. On a late-1970s Subaru, the car's own age, brakes, suspension condition, alignment, and general mechanical state are usually more limiting in real-world driving than the tire's posted speed symbol.

Construction still matters. A bias-ply 6.15-13 will not feel the same on the road as a radial 155R13, even though both belong to the same fitment family. For any longer highway use, inspect the tires closely, confirm pressures, and be realistic about the vehicle's vintage design and maintenance condition. Safe use comes from the whole package working together, not from the tire size alone.

Inflation pressure for a 1979 Subaru should be set by the vehicle's factory recommendation and the exact tire's own rated limits rather than by a one-size-fits-all number. In the available 155R13 offerings, one product also carries a 937-pound maximum load figure, but that does not by itself establish the correct running pressure for every 1979 Subaru application. Pressure should never be transferred casually from one tire size or construction type to another.

The best practice is to start with the owner's manual or factory placard for the car, then confirm that the tire's own service description and sidewall information support the intended use. Bias-ply and radial tires may respond differently in feel and wear even when mounted on the same nominal wheel diameter. If the car has non-original wheels or a mixed setup, pressure selection deserves even more care than usual.

Before a longer drive in a 1979 Subaru, inspect each tire for cracking, cuts, punctures, bulges, tread separation, and uneven wear, and confirm that all four are holding proper pressure. Check valve stems carefully, and if your chosen tire setup uses tubes, make sure the stems and sealing points show no signs of aging or movement. The spare tire deserves the same attention because a decades-old spare often looks better than it actually is.

Tires are only one part of the pre-drive checklist on a car of this age. A longer outing also calls for a broader mechanical once-over that includes brakes, steering, suspension, lights, and fluid levels. Starting with the tires is still the right habit, because they are your only contact with the road and often provide the earliest warning that a collector Subaru is not ready for distance.