1970 Subaru FF-1 Tires

The 1970 Subaru FF-1 uses two primary tire sizes: 155R13 in radial construction and 6.15-13 in bias-ply construction. Both sizes are associated with the FF-1 on a 13-inch rim, so the vehicle can legitimately be encountered with either construction style rather than one universal modern replacement size.

That makes construction the main fitment decision. A 155R13 keeps the car in a compact Euro-metric radial format, while 6.15-13 preserves a traditional numeric bias-ply setup. Before choosing, confirm the wheel diameter on the car and consider whether the goal is restoration-oriented appearance, regular road use, or maintaining the setup already on the vehicle.

Both primary tire sizes used on the 1970 Subaru FF-1 are built around a 13-inch rim diameter. That applies to the 155R13 radial size and the 6.15-13 bias-ply size, so rim diameter stays consistent even though the tire sizing systems and construction types differ.

Rim diameter is only the first check. The car may still need wheel-width confirmation, especially if the wheels have been changed over the years or if a radial tire is being installed in place of a bias-ply. Verifying the actual wheel on the vehicle helps avoid selecting the right diameter in the wrong overall wheel configuration.

Yes. The 1970 Subaru FF-1 Sedan and 1970 Subaru FF-1 Wagon both use the same two tire-size options: 155R13 radial and 6.15-13 bias-ply. There is no separate tire-size split between these covered sub-models, so fitment is consistent across the FF-1 body styles shown here.

Since the sub-models share the same sizing pattern, buyers do not need to chase a Sedan-only or Wagon-only tire size. The better question is which construction belongs on the individual car today. Checking the wheel setup, the vehicle's current stance, and the owner's appearance goals will usually matter more than the body style itself.

On the 1970 Subaru FF-1, 6.15-13 is a bias-ply tire size. It uses the older numeric bias-ply sizing format, where the number represents nominal section width in inches and the final number identifies the 13-inch rim diameter rather than a modern metric radial layout.

That matters because bias-ply and radial tires differ in both presentation and setup expectations. A buyer choosing 6.15-13 is usually preserving a more traditional look and construction type, while a buyer considering 155R13 is moving to the radial side of the FF-1 fitment picture. Wheel condition, wheel width, and the car's intended use should all be checked before changing construction.

A 1970 Subaru FF-1 can be fitted with either 6.15-13 bias-ply tires or 155R13 radial tires, so the right choice depends on how the car is being used and how closely the owner wants to follow a traditional presentation. Both constructions belong to the FF-1 fitment story.

Bias-ply tires tend to appeal to restoration-oriented owners who want an earlier look, while 155R13 radials suit buyers who want a period-style radial format on a 13-inch wheel. The decision should be made after confirming wheel dimensions, overall vehicle condition, and whether the suspension and clearances remain consistent with the setup being considered.

The first step is confirming that the car is set up for the radial size being considered, which for the 1970 Subaru FF-1 is 155R13 on a 13-inch rim. A conversion from 6.15-13 bias-ply to radial should also include a close look at wheel width, overall tire dimensions, and the condition of the wheels themselves.

Clearance around suspension components, steering travel, and fender openings should be reviewed before making the change, especially on an older compact car that may have seen repairs or modifications. It also helps to inspect alignment and suspension wear, since a radial conversion can highlight issues that were less noticeable with an older bias-ply setup.

Start by confirming that the car is being fitted with the radial side of FF-1 fitment, since 155R13 is the radial primary size for this model. Then compare the available 13-inch options by construction details, tire series, rim-width compatibility, and how closely the tire's overall character matches the way the car will be used.

Michelin and Dunlop both offer blackwall 155R13 choices, but the selection process should go beyond brand name alone. A restoration-minded owner may care most about period-style appearance, while a driver-focused owner may prioritize staying within the wheel's compatible range and selecting a tire series that suits regular road use on a light vintage import.

The available 155R13 radial products for the 1970 Subaru FF-1 are offered in blackwall form. That gives the car a clean, understated imported-car appearance that fits naturally with a compact early-1970s Subaru, especially for owners staying with a radial presentation on the original 13-inch rim diameter.

Sidewall style affects the visual balance of a small vintage car more than many buyers expect. On an FF-1, a blackwall keeps the look restrained and functional rather than decorative. If appearance is a major priority, sidewall treatment should be considered alongside construction type, because the broader visual difference may come from radial versus bias-ply more than from branding alone.

For the 155R13 radial size used on the 1970 Subaru FF-1, available brands include Michelin and Dunlop. Those options appear in series such as Michelin XAS-FF and SP Sport Aquajet, giving buyers more than one period-oriented radial path within the same general size category.

Brand should be one part of the decision, not the only one. It helps to compare the tire series, blackwall presentation, and wheel-compatibility details against the actual car. Owners who are deciding between retaining a traditional bias-ply setup and moving to a radial should settle the construction question first, then compare brands within the chosen format.

A period-style 1970 Subaru FF-1 can be approached in two different ways: 6.15-13 bias-ply for a more traditional early-era look, or 155R13 radial for a compact imported-car radial presentation that still suits the car's time period. Both sizes belong to the FF-1 fitment picture, so the choice is largely visual and use-based.

Owners focused on restoration appearance often begin by deciding how strictly they want the tire construction to reflect the car's original-era character. Bias-ply tires generally lean more vintage in profile and stance, while blackwall radials keep a tidy road-going look. If exact originality matters, comparing the car against period photos or marque-specific reference material is worthwhile.

Tire construction changes the look of a restored 1970 Subaru FF-1 more than the size codes alone suggest. A 6.15-13 bias-ply gives the car a distinctly traditional visual character, while a 155R13 radial creates a more modernized period appearance even though both sizes use the same 13-inch rim diameter.

That visual difference shows up in the way the tire fills the wheel opening and complements the car's overall stance. On a compact vintage Subaru, small changes in tire shape are easy to notice. Choosing between bias-ply and radial should therefore be treated as both a fitment decision and an appearance decision, especially during a careful restoration.

Yes. A 1970 Subaru FF-1 may have the correct nominal tire size on paper and still need extra fitment checks if the car has aftermarket wheels, altered suspension height, brake changes, or body repairs that affect clearance. That applies whether the car is using 155R13 radials or 6.15-13 bias-ply tires.

A modified wheel or suspension setup can change how the tire sits during steering and suspension travel, even with the correct 13-inch rim diameter. Owners should verify wheel width, inspect for rubbing marks, and check front and rear clearance at full steering lock and under load before assuming the original fitment pattern still applies.

Before road use, inspect the wheels, valve stems, lug hardware, and the surrounding suspension and steering components on the 1970 Subaru FF-1. Tire pressure should be set appropriately for the chosen tires, and the tires themselves should be checked for proper seating, even tread contact, and any immediate signs of interference.

A short test drive should be followed by another look at clearances and air retention, especially on a vintage car that may not be driven often. It also helps to pay attention to vibration, pull, or unusual steering feel. Those symptoms can point to alignment issues, wheel problems, or a mismatch between the tire choice and the car's current setup.

Collector-car tire care starts with regular visual inspection, even when the 1970 Subaru FF-1 is driven sparingly. Whether the car uses 155R13 radials or 6.15-13 bias-ply tires, owners should watch for cracking, bulges, cuts, irregular wear, and gradual air loss that can go unnoticed on a low-mileage vehicle.

Storage conditions matter as much as mileage on an older car. Keeping the FF-1 away from prolonged sunlight, excess heat, moisture, and ozone sources helps protect tire condition over time. It is also smart to check pressures before every outing and to inspect the spare and road wheels periodically rather than waiting until a longer drive is planned.