1978 Saab Tire Fitment Guide

1978 Saab vehicles use two tire sizes: 165R15 and 175/70R15, and both apply to the Saab 99. Both are radial tires and both mount on 15-inch wheels. The approved rim-width range published across the available products runs from 4.5 to 6.0 inches for each size, with some products expressing that range as 4.50 to 6.00 inches.

That means the first fitment question is not wheel diameter, since both sizes stay with a 15-inch rim. The important step is confirming which size belongs on your particular 1978 Saab 99 and whether you want to stay with the taller 165R15 profile or the lower-profile 175/70R15 approach. Checking the tire already on the car, the wheel width, and any restoration records will usually answer that quickly.

On a 1978 Saab, 165R15 is a European-style metric radial size. The 165 refers to nominal section width in millimeters, the R identifies radial construction, and the 15 is the wheel diameter in inches. Because no aspect ratio is printed in the size itself, this format conventionally corresponds to an 80-series profile on modern reproduction tires.

For a Saab 99 owner, that translates to a relatively tall-profile radial on a 15-inch wheel, very much in keeping with how many European cars were sized in the period. It is also the size with the broadest appearance range here, spanning blackwall, narrow whitewall, and wide whitewall versions. If your car is being restored with an eye toward period character, 165R15 is often the first size worth verifying.

On a 1978 Saab, 175/70R15 is a metric radial size with more information built into the code than 165R15. The 175 is the nominal section width in millimeters, 70 is the aspect ratio, R indicates radial construction, and 15 is the wheel diameter in inches. The available tires in this size also carry an H speed rating, which has a 130 mph ceiling.

That lower 70-series profile gives a different visual and driving character than a conventional 165R15 radial while keeping the same 15-inch wheel diameter. For a Saab 99 owner, the practical point is to verify that the car was set up for 175/70R15 rather than assuming any 15-inch Saab tire is interchangeable. Matching the exact size helps preserve intended gearing feel, stance, and steering response.

Choose 165R15 if your 1978 Saab 99 is meant to retain a more period-style European radial look, especially if sidewall appearance matters, since that size is offered in blackwall, narrow whitewall, and wide whitewall versions. Choose 175/70R15 if your car already uses that lower-profile size or if you want to stay with that more modern metric profile. Both sizes are radial and both fit 15-inch wheels, so this is mainly a sizing decision within the Saab 99 range rather than a bias-ply-versus-radial choice.

The safest path is to confirm the exact size already fitted, then compare that against your wheel width and the car's intended use. A car restored for factory-style appearance may point you toward 165R15, while a driver-oriented Saab 99 that has long worn 175/70R15 may be better served by staying there. Changing size without checking clearance and wheel width can create unnecessary fitment headaches.

1978 Saab tires are available in more than one sidewall style, but the choice depends on size. The 165R15 comes in blackwall, narrow whitewall, and wide whitewall versions, while the 175/70R15 is offered in blackwall only. All of those options remain radial tires, so the sidewall choice is largely about appearance rather than construction.

For most Saab 99 restorations and driver cars, blackwall is the style that best suits the late-1970s European look. The whitewall options in 165R15 can appeal to owners building a personalized period presentation, but they create a distinctly different visual character from a factory-typical Scandinavian sedan. If authenticity matters for events or judging, compare your choice against original sales literature and marque-club guidance before deciding.

1978 Saab tire coverage comes from several brands across the two sizes. The 165R15 is available from Coker Classic, American Classic, Firestone, and BFGoodrich, while the 175/70R15 is available from Avon and Vredestein. That gives Saab 99 owners a mix of appearance-focused reproduction radials and performance-oriented classic radial offerings.

Brand choice matters most after you settle on the correct size. If you want the widest range of sidewall appearances, 165R15 offers the greatest variety. If your car takes 175/70R15, the decision becomes more focused, with blackwall H-rated options from Avon and Vredestein. Comparing each tire's sidewall style, published load figures, and approved rim-width range is a better guide than choosing by brand name alone.

The available 1978 Saab tires in both 165R15 and 175/70R15 are built for 15-inch rims with an approved width range of 4.5 to 6.0 inches. Some manufacturers print that range as 4.50 to 6.00 inches, but it is the same dimensional window. That means either size can work only if the wheel falls within that range.

Before changing from one Saab 99 size to the other, measure the actual wheel rather than assuming all original or replacement wheels are identical. A 15-inch diameter match alone is not enough. Verifying width protects you from sidewall distortion, bead-seat issues, and steering feel changes that come from mounting a tire on a wheel outside its intended range.

The 1978 Saab tires covered here are radial 15-inch tires without tube-type markings in their size descriptions, which points to tubeless applications in normal use. That applies to both 165R15 and 175/70R15 in the current product range. Saab 99 owners still need to consider the condition and design of the wheel itself before making a final decision.

A sound tubeless wheel, good valve stem, and clean bead seat are just as important as the tire choice. If your Saab has older restored wheels, corrosion, pitting, or prior repairs can affect whether a tubeless radial seals properly. A tire installer familiar with vintage European wheels can inspect the rim and help determine whether the wheel is suitable as-is.

A 1978 Saab 99 can often use both 165R15 and 175/70R15 on the same basic wheel diameter because both sizes are built for 15-inch rims. The approved rim-width range is also the same at 4.5 to 6.0 inches. That gives the two sizes a strong baseline of wheel compatibility if the original wheels are within that width range and remain in proper condition.

Even with that overlap, changing size should not be treated as automatic. Tire profile, section width, and the car's ride-height or suspension condition can affect clearance and appearance. If the Saab has replacement wheels or has been altered over the years, confirm actual wheel width and check clearances at full steering lock before committing to one size over the other.

A 1978 Saab should be stored on clean, properly inflated tires in a cool, dry, dark environment away from direct sunlight, electric motors, battery chargers, furnaces, and other ozone sources. Radial tires generally tolerate storage better than old bias-ply designs, but they still age from heat, UV exposure, and long periods of static loading. Moving the car periodically helps prevent flat-spotting and uneven stress in the casing.

If the Saab will sit for a long season, wash the tires, keep them off damp ground, and consider stands only if they are placed correctly and the suspension is supported safely. Tire cradles can also help if the car stays on its wheels. Good storage habits matter as much for a lightly used collector car as tread depth, because time and environment age the tire even when miles stay low.

Tires on a 1978 Saab should be judged primarily by age and condition rather than mileage. A common collector-car rule is to begin close evaluation around five to seven years of service and to treat the ten-year mark as a point where replacement deserves serious consideration, even if tread remains. The DOT date code on the sidewall is the quickest way to establish the tire's actual age.

That matters especially on a Saab 99 that may only see fair-weather use. Low annual mileage can make a tire look healthy long after the rubber has begun to harden internally. If the car feels nervous, rides harshly, shows sidewall checking, or has tires of uncertain age, replacing them is usually wiser than relying on tread depth alone.

Tires on a 1978 Saab deserve a quick inspection before every drive and a more thorough one before any extended trip. Check inflation pressure, tread wear, sidewall cracking, bulges, cuts, and any sign that the tire is not holding air consistently. On a car that sits often, also inspect valve stems closely because age can affect them as much as the tire itself.

A late-1970s Saab rewards routine checks because the tire is one of the biggest variables in how the car steers and brakes. Small issues that might go unnoticed on a modern daily driver can become much more noticeable on an older chassis. Include the spare in your inspection routine as well, since a decades-old spare is often the weakest tire on the car.

The 1978 Saab 99 would have been a radial-tire car from new, and the two sizes associated with the model here are 165R15 and 175/70R15. Both are 15-inch radial formats appropriate to the late-1970s European market. Original-equipment brand could vary by market and specification, so the most reliable authenticity benchmark is the correct size, radial construction, and era-appropriate sidewall style rather than a guessed brand name.

For a restoration, start by checking the owner's manual, sales brochure, door-jamb labeling if present, and long-term history of the individual car. Saab clubs and marque specialists can often confirm which size was typical for a given market or version of the 99. That approach keeps the car visually and mechanically consistent without overreaching into assumptions that may not apply to your exact car.

Correct tire fitment absolutely matters when showing a 1978 Saab, especially in preservation or authenticity-focused classes. Judges and knowledgeable Saab enthusiasts will notice whether the car carries an appropriate radial size, the right overall sidewall look for the era, and a profile that suits the 99's original appearance. A non-period sidewall treatment or an obviously off-size fitment can stand out even when the car is otherwise well restored.

That does not mean every event uses the same standard. Some shows reward cleanliness and presentation more than factory correctness, while marque judging may be much stricter about size and appearance. If trophies matter, verify your target event's rules before mounting whitewalls or changing from one approved Saab 99 size to the other, and use club guidance to settle close authenticity questions.

For a 1978 Saab using 175/70R15, both the Avon CR6ZZ and the Vredestein Sprint Classic are blackwall radial tires with H speed ratings and the same 15-inch rim diameter. Both fit the same 4.5 to 6.0 inch rim-width range. The Vredestein publishes a max load of 1,168 pounds at 51 psi and carries a heavier construction at 31 pounds, while the Avon weighs 21.38 pounds.

Those differences make this a detail-driven choice rather than a broad fitment question. If you are comparing the two for a Saab 99, look at how each tire's construction weight, published load information, and tread character align with the way the car will be used. Staying within the correct size and wheel range matters first; choosing between these two comes after that.

1978 Saab tires can be suitable for highway driving when they are the correct size, in sound condition, and matched to a roadworthy car. The 175/70R15 options here carry H speed ratings, which means a 130 mph ceiling. The 165R15 products here do not show a speed letter in the size wording, so highway suitability depends more on the tire's condition, correct inflation, and the realistic operating range of the Saab 99 than on chasing high-speed capability.

In normal U.S. highway use, a healthy late-1970s Saab's brakes, suspension, alignment, and steering condition are often more limiting than the tire itself. Old rubber, underinflation, and suspension wear create a bigger safety problem than selecting between two proper radial sizes. Before any highway trip, inspect the tires carefully and make sure the rest of the car is equally ready for sustained-speed driving.

Inflation pressure for a 1978 Saab should begin with the factory recommendation for the Saab 99, then be checked against the tire manufacturer's published limits for the exact size you choose. In the current 165R15 range, max load figures appear at about 1,168 to 1,170 pounds with maximum pressures of 35 to 36 psi. In 175/70R15, Vredestein publishes 1,168 pounds at 51 psi, and that figure should not be transferred to any other size or tire.

Maximum sidewall pressure is not the same thing as the correct operating pressure for the car. The right setting depends on vehicle weight distribution, suspension tuning, and the manufacturer's intended ride and handling balance. Use the Saab guidance as your starting point, then confirm the tire is being operated within its published load-and-pressure limits rather than inflating by guesswork.

Before a longer drive in a 1978 Saab, inspect each tire for sidewall cracking, cuts, bulges, irregular wear, and proper cold inflation pressure. Confirm that the tires are the same size across each axle and that valve stems are in good condition. If the car has been sitting, look closely for age-related hardening and verify the spare is usable rather than assuming it is ready simply because it has never been used.

Tires are only one part of the preparation on a car of this age. A Saab 99 should also have its brakes, belts, hoses, fluids, charging system, and wheel bearings checked before extended road use. Starting with the tires gives you a clear picture of the car's contact with the road, but the safest long-drive plan is a full vintage-car inspection rather than a tire-only check.