1979 Porsche Tire Fitment Guide

1979 Porsche vehicles use seven radial sizes across four models. The 911 uses 185/70R15, 205/55R16, 215/60R15, and 225/50R16; the 924 uses 185/70R14 and 205/60R15; the 928 uses 215/60R15 and 225/50R15; and the 930 uses 205/55R16 and 225/50R16. Rim diameters span 14, 15, and 16 inches, with rim-width recommendations varying by size where available: 185/70R14 runs from 4.5-6.5 inches, 185/70R15 from 4.5-6.5, 205/60R15 from 5.5-7.5, 205/55R16 from 5.5-7.5, 215/60R15 from 5.5-7.5, and 225/50R16 from 6.0-8.0.

That spread means year and make alone are not enough to choose correctly. A 924 owner may be working with a 14-inch or 15-inch fitment, while a 930 owner is strictly in the 16-inch range, and the 928 adds its own 225/50R15 size that does not cross over to the rest of the lineup. Start by identifying the model, then confirm the wheel diameter actually on the car, and only after that compare sidewall style, brand, and speed-rating details.

On a 1979 Porsche, 185/70R14 is a metric radial size. The 185 is the nominal section width in millimeters, 70 is the aspect ratio, the R identifies radial construction, and 14 is the wheel diameter in inches. This size is used on the 1979 Porsche 924 and appears in blackwall and wide whitewall versions, with H and V speed ratings appearing on different products and some tires carrying tubeless marking.

That combination makes 185/70R14 an easy size to misread if you are more familiar with older numeric or alphanumeric collector-car tires. For a 924 owner, the practical point is not just the width or profile, but the fact that it mounts on a 14-inch wheel and stays specific to that model within the 1979 Porsche family. Once the wheel diameter is confirmed, you can narrow the choice by desired appearance and the kind of driving the car will actually see.

No. 1979 Porsche models use different tire sizes depending on the model and wheel package. The 911 has the broadest spread, covering both 15-inch and 16-inch fitments; the 924 uses 14-inch and 15-inch sizes; the 928 uses 15-inch sizes only, including the model-specific 225/50R15; and the 930 shares 16-inch sizes with certain 911 applications. Every fitment in the range is radial, but the exact dimensions are not universal across the make.

That matters because two cars from the same year and brand can need very different tires. A 1979 Porsche 930 owner should be looking at 16-inch performance-oriented sizes, while a 924 owner may need a narrower 14-inch fitment instead. If the car has changed hands, been restored, or had wheels swapped decades ago, check the actual wheel diameter and compare it against the model’s known size family before choosing anything by appearance alone.

1979 Porsche tire choices include several sidewall treatments, and they vary by size. Blackwall is available across the core performance sizes, including 185/70R15, 205/55R16, 215/60R15, 225/50R16, 185/70R14, and 205/60R15. Wide whitewall appears in 185/70R15, 185/70R14, 205/60R15, and 215/60R15, while redline appears in 215/60R15 and raised white letters appear in 205/60R15 and 215/60R15.

For most 1979 Porsche sports-car restorations and driver builds, blackwall is the closest visual match to the marque’s late-1970s performance character. Whitewall, redline, and RWL options can still appeal to buyers building a personalized look, but they change the car’s presentation more noticeably than the underlying size code does. If authenticity is the priority, match the sidewall style to the era and market character of your specific model before focusing on brand preference.

1979 Porsche tires are available from Michelin, BFGoodrich, Dunlop, Avon, American Classic, and Coker Classic, depending on size. Michelin and BFGoodrich appear across multiple fitments, including 16-inch 911 and 930 sizes, while Dunlop and Avon cover several classic metric applications. American Classic and Coker Classic appear in selected 15-inch sizes with more stylized sidewall treatments such as whitewall or redline.

Brand choice usually follows the kind of car you are building and the look you want. A 930 or later-wheel 911 owner may gravitate toward blackwall performance radials, while a 924 or 15-inch 911 owner has a broader visual range that includes whitewall or RWL options in some sizes. Once the correct size is confirmed, compare brands within that size rather than assuming a favorite brand will cover every 1979 Porsche fitment.

For 1979 Porsche applications in 205/55R16, BFGoodrich choices carry W speed ratings, which correspond to 168 mph, while the Michelin SX MXX3 N2 carries a Y speed rating, which corresponds to 186 mph or more. Both brands use blackwall radial construction and fit 16-inch rims with a 5.5-7.5 inch width range. Load figures also differ where stated, with BFGoodrich examples reaching 1,356 pounds and 1,477 pounds on certain products.

The practical difference is not that one automatically fits better, but that the products occupy slightly different places within the same size. A buyer comparing 205/55R16 tires for a 1979 Porsche 911 or 930 should first verify the exact application, then weigh speed-rating target, brand character, and any load figure that matters for the car’s setup. Keeping the comparison inside one size avoids chasing appealing specs that belong to a different wheel diameter altogether.

Rim-width guidance for 1979 Porsche tires varies by size. 185/70R14 fits rims from 4.5 to 6.5 inches depending on product; 185/70R15 also spans 4.5 to 6.5 inches; 205/60R15 and 215/60R15 run from 5.5 to 7.5 inches; 205/55R16 fits 5.5 to 7.5 inches; and 225/50R16 fits 6.0 to 8.0 inches. Those ranges are product-specific, so the exact wheel on the car still needs to be checked against the tire you choose.

That is especially important on a 1979 Porsche because the lineup crosses multiple wheel diameters and profile heights. A tire can have the right overall size family for the model but still be happier on one wheel width than another within that allowable range. Confirm the wheel width stamped on the rim or measured on the car, then compare it with the tire’s approved range before committing to a particular brand or series.

Most 1979 Porsche fitments here are radial tires, and tubeless marking appears on several products, including examples in 185/70R15, 205/55R16, 225/50R16, 185/70R14, and 205/60R15. At the same time, not every product in those sizes carries the same tube notation, so tube status can vary by product rather than staying uniform across the entire size. The 15- and 16-inch performance-oriented blackwall choices are commonly presented as tubeless radials.

The safest approach is to check the exact sidewall marking on the tire you plan to use and then consider the wheel itself. An older wheel’s condition, design, or restoration history may influence whether a tubeless setup is appropriate even when the tire is marked TL. If the car has original wheels that have not been inspected in years, have the wheel condition and valve-stem area checked before deciding on final installation details.

A 1979 Porsche should be stored in a cool, dry, dark space away from direct sunlight, electric motors, battery chargers, furnaces, and other ozone sources that accelerate rubber aging. Keep the tires properly inflated, avoid letting the car sit on damp ground, and move it periodically so the same footprint is not carrying the load for months at a time. Radials generally resist long-term flat-spotting better than older bias-ply designs, but static storage still ages the casing and sidewalls.

If the car will be parked for an extended season, many owners either roll it occasionally or support it in a way that reduces sustained load while preserving suspension geometry. That matters on a low-slung sports car like a 1979 Porsche, where a hardened or flat-spotted tire can be very noticeable the next time the car is driven. A simple storage routine often does more for tire life than adding miles ever will.

On a 1979 Porsche, tire age matters more than mileage in many cases because collector cars often see light, seasonal use. A good rule is to begin careful age-based evaluation around the five- to seven-year point and to treat about ten years as the stage where replacement deserves serious consideration regardless of tread depth. The DOT date code on the sidewall gives the tire’s week and year of manufacture.

That timeline is especially relevant for a car that may spend long stretches parked and then return to highway use with little warning. A tire can still look respectable at a glance while the rubber has hardened, the casing has aged, or small cracks have started around the sidewall and tread area. If a 1979 Porsche has an older set with unknown service history, age should carry at least as much weight as remaining tread.

Tires on a 1979 Porsche should be inspected before every drive and more thoroughly before any extended outing. Look for sidewall cracking, tread separation, cuts, bulges, uneven wear, and pressure loss, and make sure the spare is in equally usable condition. On products marked tubeless, valve stems and bead area deserve attention as well, particularly on older wheels that may have been repainted or restored.

Frequent inspection is one of the easiest ways to avoid being surprised by a tire that has aged quietly in storage. Performance-oriented Porsches also tend to make alignment or inflation issues obvious through steering feel and tread wear, so catching a problem early protects both the tire and the driving experience. A quick pre-drive walkaround is useful, but a hands-on pressure and condition check is the better habit.

A 1979 Porsche 911 would have been a radial-tire car from the factory era, and the 1979 Porsche range here is entirely radial in construction. The 911 uses 185/70R15, 205/55R16, 215/60R15, and 225/50R16 depending on application, so originality starts with matching the car to the correct size family and wheel diameter rather than assuming every 911 used one setup. Blackwall presentation is generally the visual direction most enthusiasts expect for a late-1970s Porsche sports car.

For a serious restoration, verify the exact wheel and market specification of the individual car before choosing a tire. Porsche owners often encounter wheel changes made over decades, and a car that looks correct at a glance may now sit on a later or alternate-diameter wheel package. If the project is headed for judged competition, a marque club or Porsche specialist is the right place to confirm which of the 911’s available 1979 sizes best matches your specific car.

Yes, correct tire fitment matters on a shown 1979 Porsche because judges and informed enthusiasts notice size, construction, wheel diameter, and sidewall appearance. A 924 wearing an obviously different profile than its proper 14- or 15-inch fitment, or a 911 carrying a sidewall style that clashes with a late-1970s Porsche presentation, can look out of step even when the tire physically mounts. On collector cars, visual correctness is often as important as simple roadworthiness.

For most event standards, the safest path is to match the proper size first, then choose the sidewall style that best suits how the car would have been presented in period. Blackwall usually aligns most naturally with 1979 Porsche expectations, while whitewall, redline, or raised white letters create a more customized appearance. Event rules vary, so owners chasing high-level authenticity should confirm the standard with the organizing club before finalizing tire choice.

For a 1979 Porsche in 185/70R15, the Michelin XWX is a blackwall radial marked 185/70VR15 89V TL and fits a 15-inch rim with a 5.00-6.50 inch width range. The BFGoodrich Silvertown Radial in the same size uses a 2.25-inch whitewall, carries a maximum load figure of 1,257 pounds at 35 psi, and also fits a 15-inch rim with a 5.00-6.50 inch width range. Both are radial tires, but they create very different visual results on the car.

That makes the choice more about presentation and intended character than basic compatibility. A buyer pursuing a late-1970s Porsche sports-car look will usually lean toward the blackwall Michelin-style appearance, while the wide-whitewall BFGoodrich creates a deliberately different aesthetic. Since both share the same rim-diameter family and similar rim-width guidance, the deciding factors become sidewall style, speed marking, and how closely the finished car should reflect period Porsche norms.

1979 Porsche tires can be appropriate for highway driving when the correct size is chosen, the tire is in sound condition, and the speed rating matches the intended use. Speed ratings in these sizes include S at 112 mph, H at 130 mph, V at 149 mph, W at 168 mph, and Y at 186 mph or more, depending on the product. All of the fitments here are radial, which aligns well with the road manners expected from late-1970s Porsche vehicles.

Highway safety depends on more than the speed letter alone. A well-maintained 1979 Porsche with healthy brakes, suspension, alignment, and fresh rubber will usually inspire more confidence than one wearing old tires with a heroic speed rating. Match the tire to the car’s actual use, keep pressures correct, and remember that age, storage history, and mechanical condition matter just as much as the numbers molded into the sidewall.

Inflation pressure on a 1979 Porsche should follow the vehicle manufacturer’s recommendation for the car and wheel package first, then be checked against the tire maker’s stated maximum where that information is present. Some products in these sizes show load and pressure figures such as 1,257 pounds at 35 psi for 185/70R15, 1,201 pounds at 35 psi for 185/70R14, 1,301 to 1,521 pounds at 32 to 35 psi for 205/60R15, 1,411 to 1,477 pounds at 35 psi for 215/60R15, and 1,389 to 1,477 pounds at 50 to 51 psi for certain 16-inch fitments.

Those figures are not blanket operating pressures for every 1979 Porsche application in that size. They are load-and-pressure references tied to specific tires, and they should not be transferred casually from one size or series to another. The best practice is to begin with the car’s recommended settings, confirm the tire’s own sidewall information, and then adjust only within those limits while watching wear pattern, handling feel, and cold-pressure consistency.

Before a longer drive in a 1979 Porsche, inspect each tire for cracking, cuts, bulges, punctures, irregular wear, and proper cold inflation pressure. Check that the valve stems are sound, make sure the spare is usable, and verify that the tires are appropriate to the wheel diameters on the car, whether 14, 15, or 16 inches. If the car has recently come out of storage, pay extra attention to age, hardening, and any vibration that might suggest flat-spotting or internal damage.

The tire check should be part of a broader pre-drive routine that also covers brakes, fluids, belts, lights, and suspension condition. A 1979 Porsche is a rewarding road car, but it is still an older machine whose mechanical state can change faster in storage than in regular use. Catching a small tire or wheel issue at home is far easier than sorting it out on the shoulder after heat and speed have made it worse.