1970 Saab Sonett Tires

A 1970 Saab Sonett uses either a 155R15 radial or a 560-15 bias-ply tire. Both are 15-inch fitments, so the size choice is tied more to construction and presentation than to a change in wheel diameter.

That means the real decision is whether the car is staying with a traditional bias-ply setup or using a radial in a vintage-compatible size. Before selecting a tire, confirm the actual wheel on the car, especially if it has been changed over the years, and make sure the tire choice matches the Sonett’s intended use and appearance goals.

The 1970 Saab Sonett uses a 15-inch rim with both of its primary tire sizes. The radial 155R15 and the bias-ply 560-15 are both built around that same wheel diameter.

Rim diameter is only part of the fitment picture, though, because wheel width still matters when comparing actual tire options. Radial and bias-ply products in these sizes can have different approved rim-width ranges, so it is worth measuring the wheel already on the car before changing construction or moving from one tire family to another.

The 1970 Saab Sonett III & V4 uses the same two primary tire sizes associated with this model range: 155R15 in radial construction and 560-15 in bias-ply construction. Both fit a 15-inch rim.

That keeps sub-model fitment relatively simple, but it does not eliminate the need to inspect the car itself. A Sonett that has seen wheel changes, suspension work, or a prior conversion from bias-ply to radial may need closer checking so the selected tire matches the current wheel width and the way the car is actually set up.

On the 1970 Saab Sonett, 560-15 is a bias-ply tire size. It is the vintage numeric fitment option and differs from the 155R15, which is the radial size used on the same 15-inch wheel diameter.

That distinction matters because changing from 560-15 bias-ply to a radial changes more than the construction label alone. The wheel width, the tire’s approved fitment range, and the car’s steering and body clearance should all be checked so the Sonett’s existing setup supports the intended tire choice.

Radial equivalents for 560-15 on a 1970 Saab Sonett include 155R15 and 560R15. The 155R15 is an 80-series metric radial equivalent, while the 560R15 is a bias-look radial equivalent for buyers who want a more traditional appearance.

Those sizes should be treated as alternatives rather than automatic replacements. A recommended rim-width range of 4 to 5 inches applies to the equivalent path, and the final choice should be checked against the actual wheel, the Sonett’s available clearance, and the owner’s goal for driving feel versus vintage presentation.

Either can be appropriate on a 1970 Saab Sonett because both constructions appear within the correct fitment range for the model. A 560-15 keeps the car in a traditional bias-ply format, while a 155R15 moves to a radial size that still suits the Sonett’s vintage dimensions.

The better choice depends on what matters most for the car. A restoration-oriented owner may prefer the look and character of bias-ply construction, while a driver-focused owner may want to evaluate a radial setup. Wheel width, clearance, and the condition of the suspension and steering should all be reviewed before making the change.

Start with the correct primary size and construction for the way the 1970 Saab Sonett is set up today. The main choice is between 155R15 radial and 560-15 bias-ply, both on 15-inch rims, with each size leading to a different mix of brands, tire series, and appearance.

After the size decision, compare wheel-width compatibility, sidewall style, and how the car will actually be used. A road-driven Sonett may push the decision toward radial options, while a more restoration-oriented project may lean toward bias-ply. It also helps to compare load figures and other product details when those specifications affect the intended use.

Sidewall style depends on the tire size you choose for the 1970 Saab Sonett. The 155R15 radial options are offered as blackwalls, while the 560-15 bias-ply choices include blackwall, narrow whitewall, and wide whitewall versions.

That makes sidewall treatment an important visual decision, especially on a small specialty car where tire appearance is easy to notice. A blackwall tends to keep the look restrained and sporting, while whitewall options create a more stylized vintage presentation. The right choice should match the car’s restoration direction rather than simply the tire size alone.

Tires for the 1970 Saab Sonett are available from Firestone, Michelin, Avon, Vredestein, US Royal, Coker Classic, and Pro-Trac. The brand mix changes by size, with the radial 155R15 and the bias-ply 560-15 each carrying their own product families.

Brand is best used as one part of the decision rather than the whole decision. It helps to compare the brand alongside construction type, sidewall style, tire series, and wheel-width suitability. On a Sonett, the right tire often comes down to which brand offers the combination that best matches the car’s current setup and intended appearance.

For a period-style 1970 Saab Sonett, the starting point is usually the 560-15 bias-ply because it preserves the vintage size format and construction style associated with older tire presentation. The 155R15 radial can also suit a classic Saab if the goal is a vintage-looking radial setup rather than a traditional bias-ply look.

Appearance details matter once the size is settled. Blackwall keeps the look understated, while narrow or wide whitewall versions of 560-15 create a more decorative period statement. If exact originality is important, the final brand and sidewall decision should be checked against marque references or vehicle-specific historical documentation.

Tire construction changes the visual character of a restored 1970 Saab Sonett as much as it changes the technical setup. A 560-15 bias-ply gives the car a more traditional vintage presentation, while a 155R15 radial brings a later-style European radial look that still fits the Sonett’s era.

That difference becomes even more noticeable when sidewall style enters the picture. Bias-ply 560-15 choices include blackwall and whitewall treatments, while the 155R15 radial options are blackwall only. For a restoration, it helps to decide early whether the finished car should lean toward traditional showroom-era style or a road-use-focused classic appearance.

Yes, modifications can affect tire fitment on a 1970 Saab Sonett even when the tire size itself is correct. Changes such as aftermarket wheels, altered wheel width, suspension work, ride-height changes, or body repairs can all influence how a 155R15 or 560-15 actually sits on the car.

A Sonett with changes from original-style setup should be checked carefully before moving between bias-ply and radial construction or before choosing a radial equivalent. Wheel diameter is fixed at 15 inches here, but wheel width, steering travel, and fender clearance still need attention so the tire works with the car as it exists now.

Before driving a 1970 Saab Sonett on new tires, inspect the wheels for correct diameter and condition, confirm the tire is seated properly, and verify inflation is appropriate for the tire being used. It is also smart to look over the valve stems, wheel hardware, and the general condition of the suspension and steering components.

A short clearance check can prevent trouble on the road. Turn the steering from lock to lock, look for contact near the inner fenders and suspension, and pay attention to any rubbing once the car is moving. On a low-use collector car, an early recheck for air loss and hardware tightness is worthwhile after the first miles.

Collector-car tire maintenance for a 1970 Saab Sonett starts with regular pressure checks, routine inspection for cracks, cuts, bulges, and uneven wear, and occasional review of tread condition even if the car is driven sparingly. Tires on low-mileage classics can age visibly and structurally long before the tread looks worn out.

Storage conditions matter almost as much as mileage. Keeping the Sonett away from prolonged sunlight, excess heat, moisture, and ozone sources helps preserve both radial and bias-ply tires. It also helps to inspect the tires before every longer drive, since a car that sits often can develop flat-spotting, air loss, or age-related condition issues between outings.