1971 Saab Sonett Tires

The 1971 Saab Sonett uses two primary tire sizes: 155R15 in radial construction and 560-15 in bias-ply construction. Both sizes are associated with the Sonett III & V4 and both use a 15-inch rim, so the fitment decision is less about wheel diameter and more about which construction and presentation best match the car.

A buyer standing in front of the car should first confirm what is already on the vehicle and whether the goal is to keep a traditional bias-ply setup or use a radial. That matters because the two sizes follow different sizing systems, have different product choices, and can change the character and appearance of the Sonett.

The 1971 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 a 15-inch wheel, which keeps rim diameter simple even though the car may be wearing either construction type.

Rim diameter is only the first checkpoint. Wheel width should also be verified before selecting a tire, especially if the car has been changed from stock wheels or if a radial equivalent is being considered for a bias-ply setup. On a low, compact car like the Sonett, steering and body clearance are worth checking at the same time.

The 1971 Saab Sonett III & V4 shares the same overall fitment pattern as the model line, with both 155R15 radial and 560-15 bias-ply sizes associated with it. That means the sub-model itself does not force a different rim diameter, but it still leaves room for a construction choice.

In practical terms, the next question is how the individual car is set up now. If it is being kept restoration-oriented, a 560-15 bias-ply may be the direction to examine first. If the Sonett is driven regularly and already uses a radial-friendly setup, 155R15 becomes the more natural size to evaluate.

On the 1971 Saab Sonett, 560-15 is a bias-ply tire size. It uses a vintage numeric sizing format, where the 5.60 designation refers to nominal section width and the 15 indicates the rim diameter, making it a traditional small-car bias-ply fitment on a 15-inch wheel.

That matters because a bias-ply Sonett will have a different tire character and appearance than one fitted with the 155R15 radial. Buyers comparing options in 560-15 should focus on sidewall style, brand, and wheel-width compatibility, then confirm that the car’s present wheels and clearances still suit a bias-ply tire.

Two radial-equivalent sizes are available for the 560-15 fitment on a 1971 Saab Sonett: 155R15 as an 80-series metric radial equivalent and 560R15 as a bias-look radial equivalent. Both preserve the 15-inch rim diameter, but they represent different ways of moving from a bias-ply size into radial construction.

The 155R15 option follows a Euro-metric radial format, while 560R15 is intended to retain a more traditional visual impression. A recommended rim-width range of 4 to 5 inches applies to these equivalents, so wheel width, tire dimensions, and clearance should be checked carefully before using either one in place of the original bias-ply size.

That choice depends on how the 1971 Saab Sonett is being used and what you want the finished car to look and feel like. A 560-15 bias-ply keeps the Sonett in a more traditional vintage tire format, while 155R15 gives the car a true radial fitment on the same 15-inch rim.

Owners focused on restoration flavor often begin with the bias-ply size, especially when sidewall styling is part of the visual plan. Drivers who want a radial setup should still confirm wheel width and clearance before changing construction. The best choice is usually the one that matches the car’s intended use, wheel setup, and appearance goals.

Start with the two correct size paths for the 1971 Saab Sonett: 155R15 radial or 560-15 bias-ply, both on a 15-inch rim. From there, the real decision is whether the car should keep a traditional bias-ply feel and look or move toward a radial setup that still suits the Sonett’s compact European proportions.

After size and construction, compare brand, tire series, sidewall treatment, and wheel-width compatibility. A blackwall radial from Michelin, Firestone, Avon, or Vredestein gives a very different buying profile than a whitewall or blackwall bias-ply from Firestone, US Royal, or Coker Classic. Matching the tire to the car’s mission usually narrows the choice quickly.

The 1971 Saab Sonett has several sidewall treatments available depending on which tire size and construction you choose. The 155R15 radial options are blackwall, while 560-15 bias-ply products are offered in blackwall, narrow whitewall, and wide whitewall forms.

That sidewall difference has a strong effect on how the car presents. A blackwall radial tends to suit a cleaner European sports-car look, while the bias-ply whitewall options create a more stylized vintage appearance. Sidewall style should be chosen after the correct size and construction are settled, not as a substitute for proper fitment.

Tires for the 1971 Saab Sonett are available from Firestone, Michelin, Avon, Vredestein, US Royal, Coker Classic, and Pro-Trac. The brand mix depends on the size you choose, with 155R15 leaning toward European-style radial offerings and 560-15 centered on bias-ply products with several traditional sidewall treatments.

Brand alone should not make the decision. It is more useful to compare the actual size, construction, tire series, sidewall style, and wheel-width specification that come with each product. On a car like the Sonett, those details have a bigger effect on the finished setup than the brand name by itself.

A period-style 1971 Saab Sonett can be approached from either side of its fitment range, depending on the look you want. The 560-15 bias-ply size delivers the more traditional vintage sizing convention, while 155R15 retains a distinctly European radial character that also feels appropriate to the Sonett’s era and identity.

For a restoration-oriented car, tire appearance should be considered alongside construction, not separately from it. Blackwall radials keep the presentation understated, while bias-ply choices open the door to blackwall or whitewall looks. If exact originality matters, verify historical details through Saab-specific references before treating any one brand or sidewall as the definitive answer.

Tire construction changes more than the way the car drives; it also changes how a restored 1971 Saab Sonett looks at a glance. A 560-15 bias-ply gives the car a more traditional vintage tire profile, while a 155R15 radial presents a more modernized but still era-appropriate European sports-car appearance.

That visual difference becomes even more noticeable once sidewall style is added to the decision. Radial choices here are blackwall, keeping the look restrained, while the bias-ply size allows blackwall, narrow whitewall, or wide whitewall treatments. The best appearance match is usually the one that supports the car’s restoration theme without forcing an incorrect size.

Yes, modifications can affect tire fitment on a 1971 Saab Sonett even when the nominal tire size is correct. Aftermarket wheels, altered wheel widths, suspension changes, ride-height adjustments, or body modifications can all change how a 155R15 or 560-15 tire sits within the wheel opening and steering range.

A sensible check includes wheel diameter, wheel width, and available clearance at full steering lock and suspension movement. On a compact sports car, small changes can matter. Any Sonett that has been modified should be measured carefully before changing between bias-ply, radial, or radial-equivalent tires, especially when trying to preserve both drivability and appearance.

Before driving a 1971 Saab Sonett on new tires, inspect the wheels for proper diameter and condition, confirm the new tires are mounted in the correct size, and make sure inflation is set appropriately for the tire being used. It also helps to check valve stems, balance, and whether the tires clear the body and suspension throughout steering travel.

A collector car that sees limited use deserves a broader look before heading onto the road. Check for brake drag, loose steering parts, worn suspension bushings, and anything that could cause uneven tire wear. After the first short drive, recheck tire pressure and look again for any signs of rubbing, settling, or air loss.

Tires on a collector 1971 Saab Sonett should be maintained with regular pressure checks, periodic visual inspection, and careful storage habits. Whether the car uses 155R15 radials or 560-15 bias-ply tires, watch for cracking, bulges, cuts, uneven wear, and slow air loss, especially if the car spends long periods parked between drives.

Storage conditions matter as much as mileage on a low-use car. Keeping the Sonett away from prolonged sunlight, heat, moisture, and ozone sources helps protect the tires over time. It is also wise to inspect them before every outing rather than assuming low mileage means low risk, since age-related deterioration can appear long before tread is worn out.