Subaru GL Tires

Subaru GL uses five tire sizes across its 1972 to 1989 run: 145R13 for 1972-1973, 6.15-13 for 1972-1979, 155R13 for 1973-1979, 175/70R13 for 1980-1989, and 185/70R13 for 1981-1989. Every listed size fits a 13-inch rim, but the section width and overall profile vary significantly between the early numeric size, the early euro-metric radials, and the later lower-profile metric radials.

The practical takeaway is that Subaru GL fitment is year-sensitive and sometimes configuration-sensitive rather than one-size-fits-all. Start with the exact year, then compare the size stamped on the current tire, the wheel diameter, and any restoration records so you can stay within the correct size family for the car.

A 6.15-13 tire on a Subaru GL is an older numeric bias-ply size used from 1972 through 1979. The 6.15 refers to nominal section width in inches, and the 13 refers to the rim diameter in inches. It is not the same sizing language as later 175/70R13 or 185/70R13 metric radials, even though all of them fit 13-inch wheels.

That distinction matters because a Subaru GL set up for 6.15-13 has an earlier tire character than a later radial-equipped car. If your goal is period appearance, restoration correctness, or preserving the original driving feel of an early Subaru GL, verify whether the car is meant to remain on the older numeric size before changing formats.

The 1973 Subaru GL is one of the overlap years, with 145R13, 6.15-13, and 155R13 all appearing for that model year. All three use 13-inch rims, so the split is not a wheel-diameter issue. It reflects configuration differences within the model line rather than a single universal tire size for every 1973 Subaru GL.

That means year alone is not enough to identify the correct tire on a 1973 Subaru GL. Compare the existing tire size, wheel width where known, and any factory literature or marque references tied to your exact car so you can avoid moving into the wrong width or tire construction style.

Subaru GL does not require inner tubes for its radial sizes listed here, including 145R13, 155R13, 175/70R13, and 185/70R13. The older 6.15-13 size is a bias-ply application, and a tube is required for that fitment. Tube use therefore depends on which size family your Subaru GL uses, not simply on the model name alone.

If your Subaru GL is one of the early cars that still runs 6.15-13 tires, plan the tire and tube as part of one complete fitment decision. Later metric radial cars should stay within their radial sizing unless you are intentionally restoring an earlier configuration and have confirmed wheel and application compatibility.

The quickest way to confirm the right tire size for a year Subaru GL is to match the exact model year to the listed sizes, then compare that information to the tire currently on the car. Early years can overlap between 6.15-13, 145R13, and 155R13, while later years use 175/70R13 or 185/70R13. All of them fit 13-inch rims, so the deciding factors are the year and the specific configuration.

On an unrestored car, the existing wheel and tire often provide the first clue, but old replacements can also mislead. Use the year listing as your starting point, then verify against original paperwork, service history, or a Subaru specialist if your car falls into one of the overlapping years.

Subaru GL tire options here include blackwall across several sizes, plus redline and wide whitewall choices in 185/70R13. The early 145R13, 155R13, and 175/70R13 offerings are blackwall only, while the broader 185/70R13 selection includes the decorative sidewall variants. That makes the later 13-inch radial size the most flexible if appearance matters as much as fitment.

For a stock-looking Subaru GL, blackwall is usually the most natural visual choice across the model’s production years. Redline or wide whitewall can be attractive styling decisions for a custom presentation, but they should be chosen with an eye toward the car’s intended look rather than assumed as a factory-correct finish.

Subaru GL tires in these sizes are available from Michelin, Firestone, Dunlop, Avon, BFGoodrich, and Vredestein. The early 145R13 and 155R13 sizes are represented by Michelin, Firestone, and Dunlop, while later 175/70R13 and 185/70R13 sizes bring in Avon, BFGoodrich, Michelin, Dunlop, and Vredestein. Brand choice varies by size, so the first decision is still the correct fitment rather than the brand name alone.

Once the right size is confirmed, brand selection becomes a matter of appearance, intended driving use, and preferred series. A lightly driven survivor Subaru GL may call for a different tire character than a regularly used later car, even when both are on the same 13-inch wheel diameter.

Subaru GL tire series listed here include Michelin XAS-FF, F560 Radial, SP Sport Aquajet, CR6ZZ, Silvertown Radial, Sport Classic, Michelin XDX-B, and Sprint Classic. Those series differ mainly in era character, tread style, sidewall presentation, and intended driving flavor within the correct size. The broadest choice appears in 185/70R13, where several classic-style radial series are available for later Subaru GL applications.

Choosing among series starts with how you use the car. A preservation-minded Subaru GL owner may prioritize a period-looking blackwall or classic sidewall treatment, while a more actively driven car may benefit from a later-style performance-oriented radial series within the proper size.

A Subaru GL should be stored in a cool, dry, dark space with the tires kept away from direct sunlight, electric motors, welders, and ozone-producing equipment. Clean the tires gently, keep them properly inflated, and avoid leaving the car on hot concrete or damp ground for long periods. Long static storage can create flat spotting, especially on collector vehicles that are driven infrequently.

If the Subaru GL will sit for months at a time, roll it periodically or use methods that reduce sustained load on one contact patch. Storage habits matter just as much as mileage on a collector tire, particularly on later low-profile radial sizes where age and inactivity can become more important than tread wear.

Tires on a Subaru GL should be inspected before each drive and more thoroughly several times خلال the year, especially if the car is used seasonally. Check inflation, sidewall cracking, tread separation, punctures, irregular wear, and any sign that an old spare or long-installed tire has aged out. A collector car tire can look acceptable at a glance yet still deserve closer inspection.

That routine is particularly important on Subaru GL because some years use narrower early radials or older numeric bias-ply sizing, while later years use lower-profile radials that can reveal suspension or alignment issues through uneven wear. Catching those signs early helps preserve both the tires and the way the car drives.

Subaru GL tires should be replaced when age, cracking, hardening, bulges, vibration, tread separation, or any structural concern appears, even if tread depth still looks usable. Collector vehicles often wear out tires by time and storage conditions rather than mileage. Tread alone is not a reliable measure of serviceability on a car that is driven only occasionally.

Use age, condition, and driving purpose as the real decision points for your Subaru GL. A car that sees regular road use should be evaluated more conservatively than one limited to local shows, and any tire that has been on the car for many years deserves a close inspection before being trusted for sustained driving.

Subaru GL does not point to one single original tire across the full 1972 to 1989 run, because multiple sizes appear over time. Early cars used 145R13, 6.15-13, and 155R13 depending on year and configuration, while later cars moved to 175/70R13 and 185/70R13. The available tire series today are modern reproductions or classic-style radials in those sizes rather than one universal original-equipment answer.

For restoration work, the right question is which tire belongs on your exact Subaru GL year and configuration rather than on the model name as a whole. Factory literature, surviving original cars, and Subaru marque references remain the best way to narrow the final choice when several period-appropriate size paths exist.

Correct tire fitment can absolutely affect how a Subaru GL is judged and perceived, especially on a careful restoration or preservation car. Size, sidewall style, and overall tire profile all influence whether the car presents as era-appropriate. An early Subaru GL on the wrong late-style size, or a later car on an obviously mismatched earlier format, can stand out immediately to knowledgeable enthusiasts.

That does not mean every Subaru GL must be restored to one exact visual formula, but it does mean consistency matters. If your goal is show judging, keep the tire size and sidewall treatment aligned with the car’s year and intended presentation, and use marque clubs or period photos as the final reference.

Blackwall is the sidewall style available across the broadest range of Subaru GL tire sizes listed here, including 145R13, 155R13, 175/70R13, and 185/70R13. Redline and wide whitewall appear only in 185/70R13. That makes blackwall the most natural restoration starting point unless your build intentionally pursues a custom look using one of the later decorative sidewall options.

For an authentic Subaru GL restoration, match the sidewall style to the era and personality of the specific car rather than choosing by appearance alone. A clean blackwall generally suits the model’s original compact-car character, while redline or wide whitewall makes more sense for personalized presentation than strict factory-style restoration.

A correctly sized, properly mounted, and sound-condition tire can be appropriate for driving a Subaru GL on public roads, but safety depends on more than the size alone. The wheel condition, inflation, alignment, age of the tire, and overall mechanical health of the car all matter. Subaru GL spans years that used both early narrow sizes and later low-profile radials, so road behavior will differ with the fitment.

Before regular road use, treat the tire choice as one part of a complete vehicle inspection. A Subaru GL that is mechanically sorted and wearing the correct 13-inch tire size for its year will generally be a much better road companion than a car carrying an incorrect width, an aged tire, or a mismatched set.

Before driving a Subaru GL, check tire pressure, visible condition, tread and sidewalls, wheel security, brake function, steering feel, and any signs of rubbing or clearance issues. Confirm that all four tires match in size and general construction type for the intended setup. On early overlap years, also make sure the car is not carrying a substitute size that differs from what the specific configuration should use.

A short driveway inspection can prevent many avoidable problems on an older Subaru GL. If the car has been sitting, drive gently at first and pay attention to vibration, pull, or noise, since those clues often reveal an age issue, flat spot, or mounting problem before anything becomes more serious.

The appropriate speed for a Subaru GL depends on the exact tire fitted, its age, condition, inflation, and the overall condition of the car. Even when the size is correct, an older collector tire should not be treated like a modern daily-driver tire without regard to age or service history. Prudence matters more than capability claims on a car of this era.

A sensible approach is to keep speeds moderate until you know how the Subaru GL behaves on its current tires and the rest of the chassis has been inspected. If the car is on older-style numeric bias-ply sizing, expect a different feel than a later radial-equipped GL, and drive in a way that respects that difference.