1968 Lincoln Tire Fitment Guide

1968 Lincoln vehicles use three tire sizes: 215R15, 8.45-15, and 9.15-15. All three apply to the 1968 Lincoln Continental, and all three mount on 15-inch wheels. That means the year-and-make fitment question is simple at the model level, but the size decision still matters because the three options do not represent the same construction style or road feel.

For a Continental owner, the next step is deciding whether the car is being kept close to its late-1960s character or driven with a preference for radial behavior. Once that preference is clear, confirm the actual wheel dimensions on the car and compare the tire already fitted, if present, before making a final choice.

On a 1968 Lincoln, 215R15 is a radial tire size. The 215 refers to a nominal section width of 215 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, it follows the common euro-metric radial convention rather than the later full metric format that spells out every dimension.

That matters because 215R15 reads very differently from the older numeric bias-ply sizes used on the same 1968 Lincoln Continental. If your car currently wears a radial tire, 215R15 is the modern-format size to compare against, and it should be evaluated alongside wheel width, stance, and the driving feel you want from the car.

On a 1968 Lincoln, 8.45-15 and 9.15-15 are numeric bias-ply tire sizes. In each case, the first number is the nominal section width in inches and the 15 is the wheel diameter in inches. The absence of an R in the size is part of the clue that these are traditional bias-ply sizes rather than radial sizes.

Those numeric sizes are closely tied to the look and driving character collectors expect from a large American luxury car of the period. If your Continental is being restored with authenticity in mind, these are the sizes to examine first, while the choice between 8.45-15 and 9.15-15 should be checked against the wheels and the tire size already associated with your car.

For a 1968 Lincoln Continental, the choice begins with construction. The 215R15 is the radial option, while 8.45-15 and 9.15-15 are bias-ply sizes. Radials generally appeal to owners who want a more modern road-going feel, while bias-ply tires are usually the direction taken for period-correct presentation on a late-1960s luxury car.

The decision between the two bias-ply sizes is more about matching the size that belongs on your particular car and wheel setup than about changing the vehicle’s character. A good approach is to identify what is on the car now, confirm the wheel dimensions, and then choose the size that supports either originality goals or regular driving use.

1968 Lincoln vehicles are covered through three separate tire sizes rather than through a single universal size. Availability depends on whether you are seeking the radial 215R15 or one of the two numeric bias-ply sizes, 8.45-15 or 9.15-15. Brand choice should always be reviewed within the exact size you plan to run, since the radial and bias-ply paths are not interchangeable simply by brand name alone.

That distinction is especially important on collector cars because owners often begin with the brand they recognize, then work backward to size. For a 1968 Lincoln Continental, it is smarter to settle the size and construction first, then compare brand offerings within that size for sidewall appearance, intended use, and the overall look you want on the car.

Sidewall appearance plays a major role in how a 1968 Lincoln Continental presents, because these large formal cars carry a lot of visual weight in the wheel opening. A bias-ply tire usually suits an authenticity-focused restoration, while a radial may be chosen by owners who want a more updated road-driving feel. The correct sidewall style depends on the exact tire offered in the size you choose.

For the best result, think of sidewall style as part of the car’s overall design rather than as a separate cosmetic detail. A Continental restored for judged presentation often benefits from an era-appropriate sidewall and construction, while a driver-oriented car may prioritize the radial size first and then refine the look from there.

All three 1968 Lincoln tire sizes mount on 15-inch wheels, but the exact rim width should be confirmed against the wheel actually on the car and the tire you are considering. That matters because 215R15, 8.45-15, and 9.15-15 are not simply alternate spellings of the same size. They represent different sizing systems and can place different expectations on the wheel.

A Continental owner should treat rim diameter as only the first checkpoint. Before final selection, inspect the wheel itself for its width marking or verify it through a trusted shop or marque specialist. That step helps avoid choosing a tire that matches the 15-inch diameter but is not the best partner for the wheel’s width or the car’s intended use.

1968 Lincoln tires can be tube-type or tubeless depending on the exact tire chosen within 215R15, 8.45-15, or 9.15-15. Tube use is not something to assume from the car year alone, because it can vary by product even within the same nominal size. The tire’s own sidewall marking and the wheel’s design both matter.

Before mounting a tire on a 1968 Lincoln Continental, confirm whether the product is marked tube-type or tubeless and make sure that choice matches the wheel you plan to use. If the car retains older wheels or has had wheel changes over the years, that check is especially important for getting the setup right the first time.

A 1968 Lincoln Continental uses 15-inch tire sizes across 215R15, 8.45-15, and 9.15-15, so the original wheel diameter is compatible at a basic level with all three. That makes it possible to compare a radial and two bias-ply sizes without changing the wheel diameter itself. The remaining question is whether the wheel width is appropriate for the exact tire selected.

That is why original wheels should be verified, not assumed. Wheels may have been changed during the car’s life, and even original 15-inch wheels still need to be checked for condition and width before fitting a new tire. Diameter compatibility gets you into the right family, but wheel width confirmation finishes the fitment decision.

A 1968 Lincoln should be stored away from direct sunlight, damp surfaces, and electric motors or other ozone-producing equipment that can accelerate rubber aging. Keep the tires properly inflated, move the car periodically if possible, and avoid letting the full vehicle weight sit in one exact position for very long stretches. Bias-ply tires are generally more prone to temporary flat-spotting during storage than radials.

Because the Continental is a large, heavy luxury car, storage habits matter even more than they do on a lighter collector vehicle. If the car will be parked for an extended period, clean dry flooring, inflation checks, and occasional movement can help preserve both the tire shape and the ride quality you notice when the car goes back on the road.

On a 1968 Lincoln, tire life should be judged by age and condition more than by mileage, since many collector cars are driven relatively little. A good rule is to begin evaluating closely once tires are around five to seven years old and to treat ten years as a point where replacement deserves serious consideration regardless of tread depth. The DOT date code is the starting point for that age check.

That approach is especially important for a Continental because low annual mileage can make old tires look better than they really are. Sidewall cracking, hardening, vibration, and pressure loss can all appear before the tread looks worn out. If the age is uncertain, replacement is often the wiser move than trying to stretch service life on appearance alone.

Tires on a 1968 Lincoln should be checked before every drive and more thoroughly before any extended outing. Look for cracking, bulges, cuts, irregular tread wear, and any sign that the tire is losing pressure. If the tire is tube-type, the valve stem area and the tube-compatible hardware deserve extra attention as part of the inspection.

That routine helps catch age-related problems before they become road-trip problems. A large luxury car like the Continental can feel deceptively smooth even when a tire is beginning to deteriorate, so visual inspection should be paired with a pressure check and a quick look at the spare. A few minutes in the garage can prevent a much bigger interruption later.

A 1968 Lincoln Continental was originally from the era when bias-ply fitments still defined the factory-correct look for many American luxury cars, even as radial adoption was beginning to grow in the broader market. That makes the numeric bias-ply sizes 8.45-15 and 9.15-15 the most era-appropriate starting point when the goal is authentic presentation. The radial 215R15 is better understood as a later-style alternative rather than the default originality choice.

Factory details could still vary by market, build timing, or owner changes made over the decades, so the smartest confirmation path is to compare surviving labels, original literature, and knowledgeable Lincoln marque sources. For most restorers, though, the important first distinction is simple: bias-ply supports authenticity, while radial fitment reflects a more driver-oriented direction.

Correct tire fitment matters on a 1968 Lincoln because judged collector cars are often evaluated as complete presentations, not just as body-and-paint restorations. Size, construction type, and sidewall appearance can all influence whether the car looks authentically rooted in its period. A radial tire on a car judged for factory-style accuracy may stand out in the same way as an incorrect finish or modern trim detail.

That does not mean every show car needs the same tire, because different events apply different standards. Owners aiming for concours-style authenticity should verify what their judging body expects and use marque-club guidance where possible. Owners building a road car can be more flexible, but the tire should still look proportionate and era-appropriate on a formal full-size Continental.

A 1968 Lincoln owner usually chooses a bias-ply tire because it aligns more closely with the way a late-1960s American luxury car would have looked and felt when new. The numeric sizes 8.45-15 and 9.15-15 carry the period-correct sizing language and construction style associated with that era. For restorations, that visual and historical match is often just as important as the tire’s basic dimensions.

The decision comes down to the car’s purpose. If the Continental is being preserved for judged events, vintage presentation, or a faithful driving experience, bias-ply is often the natural direction. If the car is meant for more regular highway use, the radial option may make more sense, but authenticity-minded owners generally start by examining the bias-ply sizes first.

1968 Lincoln tires can be suitable for highway driving when the size, construction, condition, inflation, and speed rating all match the way the car will be used. The 215R15 radial and the 8.45-15 and 9.15-15 bias-ply sizes should be judged by the exact tire’s sidewall markings rather than by year and size name alone. On a car of this age, overall mechanical condition is just as important as the tire itself.

The Continental was built as a substantial highway car, but safe use depends on a complete system that includes suspension, steering, brakes, and wheel condition. Before any sustained-speed driving, confirm the tire’s speed rating, inspect for age cracking or damage, and make sure the rest of the car is equally prepared. A fresh tire cannot compensate for neglected chassis or braking components.

Inflation pressure for 1968 Lincoln tires should be set with the exact tire size and tire model in mind, not borrowed from another size in the range. A 215R15 radial should not automatically receive the same pressure as an 8.45-15 or 9.15-15 bias-ply tire simply because all three fit 15-inch wheels. Factory recommendations and the tire maker’s own guidance both deserve attention.

For the best result, start with the vehicle’s original manual or placard information, then compare that guidance with the tire manufacturer’s maximum-pressure and load information for the specific product you plan to use. On a collector Lincoln, the goal is not just safe load carrying but also stable road manners, even tread wear, and the right ride quality for the car’s intended use.

Before a longer drive in a 1968 Lincoln, inspect each tire for sidewall cracking, cuts, bulges, embedded debris, uneven wear, and proper inflation. Check the spare as well, along with the valve stems and any tube-related hardware if the tires are tube-type. Because the Continental is a heavy, powerful luxury car, tire condition should be part of a broader mechanical walkaround rather than a stand-alone check.

A sensible pre-trip routine also includes verifying wheel fasteners, brakes, steering response, fluid levels, and basic lighting. On collector cars, many roadside interruptions begin with age-related issues rather than dramatic failures, so prevention matters. If the tires feel rough after storage or show any visible deterioration, solve that issue in the garage instead of asking an older car to sort it out on the highway.