In 1966, Imperial stood apart from Chrysler’s mainstream lineup as a full-size American luxury marque with dramatic styling, formal road presence, and a strong emphasis on ride comfort. Buyers choosing a sedan or convertible from this year were stepping into one of the era’s most distinctive prestige cars, built for effortless cruising more than sharp-edged sport. For 1966 Imperial, both models share a single tire size, 9.15-15, so the main decision is not between different fitments but between the right bias-ply tire style for your restoration goals and driving expectations. Confirm whether you have a sedan or convertible, then focus on selecting the correct size, sidewall look, and period-appropriate construction.
Which Tire Size Is Right for Your 1966 Imperial
One tire size serves 1966 Imperial vehicles, and that size is shared across both the sedan and convertible model range. Because there is no model-to-model size split here, the real choice centers on selecting the right bias-ply tire style for the look and driving character you want from a large luxury car of the mid-1960s. Understanding that distinction before choosing a product saves time and helps ensure the right match.
Year(s): 1966|Fit(s): All Sedans, Convertibles|Construction: Bias Ply|Rim: 15-in rim
9.15-15 is a numeric bias-ply size in which 9.15 represents the nominal section width and 15 represents the wheel diameter in inches. This size is shared across all 1966 Imperial sedans and convertibles. Bias-ply construction suits buyers who want the period-correct look and road feel that belongs on a mid-1960s American luxury car. It is the natural starting point for restoration-focused fitment, especially when keeping the car visually and historically in character.
Two 1966 Imperial models are covered here. Both use the same 9.15-15 tire size, so identifying the model is less about changing tire fitment and more about understanding the body style and restoration direction of the car you own. Select a model below for model-specific fitment history and products.
1966 Imperial All Sedans
The 1966 Imperial sedan carried the marque’s signature formal luxury character, with substantial proportions and a smooth, quiet touring mission that set it apart from ordinary full-size cars. Its tires mount on 15-inch wheels, matching the broad, confident stance expected of a top-tier American sedan from this period.
The 1966 Imperial convertible paired the same upscale Imperial identity with open-air grand touring, making it one of the more distinctive American luxury convertibles of its day. Like the sedans, it uses tires for 15-inch wheels, so the focus stays on preserving the proper visual presence and classic driving character.
These FAQs cover the shared 9.15-15 sizing used across the 1966 Imperial range, how bias-ply fitment affects restoration choices, and what to check for safe use, storage, and setup on a large collector-era luxury car.
Size Basics & Fitment
What tire sizes fit 1966 Imperial vehicles?
1966 Imperial vehicles use one tire size across the full model range: 9.15-15. That shared fitment applies to both 1966 Imperial All Sedans and 1966 Imperial Convertibles, and the size mounts on a 15-inch wheel. Since there is no second size to sort through at the year-and-make level, the fitment picture is straightforward compared with many other collector cars.
That simplicity means most buyers can begin with the size first and then narrow the choice by vehicle type, sidewall appearance, and restoration goals. If your Imperial still wears older wheels or has been changed over the years, it is still wise to verify the actual wheel diameter on the car before moving ahead, especially on a restored or modified example.
What does 9.15-15 mean on a 1966 Imperial tire?
On a 1966 Imperial, 9.15-15 is a numeric bias-ply tire size. The 9.15 figure is the nominal section width, measured in inches by period sizing convention, while the 15 refers to the wheel diameter in inches. Because it is a bias-ply format, the code does not use the modern metric structure or radial-style aspect ratio markings familiar on newer cars.
That matters because a 9.15-15 should be evaluated as a classic-era tire size, not translated casually into a modern metric replacement without checking proportions and intended use. If your goal is an Imperial that looks and feels true to the mid-1960s, understanding the older numeric sizing format helps you stay closer to the car’s original character.
Do all 1966 Imperial models use the same tire size?
Yes. Both the 1966 Imperial sedan range and the 1966 Imperial convertible use the same 9.15-15 tire size. There is no year-and-make split here between body styles, which makes size identification easier than it is on many other full-size domestic cars where wagon, performance, or heavy-duty variants sometimes differ.
The practical difference between models is therefore less about fitment and more about presentation and use. A convertible owner may place extra emphasis on show-quality appearance, while a sedan owner may be more focused on long-distance touring manners, but both start from the same basic size and 15-inch wheel requirement.
Buying the Right Tire
What sidewall styles are available for 1966 Imperial tires?
1966 Imperial tires in 9.15-15 should be chosen with sidewall appearance in mind because sidewall style has a major effect on the car’s overall look. On a mid-1960s American luxury car, whitewall presentation is often closely associated with the formal, upscale appearance buyers expect, while other sidewall treatments can shift the visual tone away from that original luxury impression.
Sidewall choice does not change the basic size fitment, but it does change how authentic the car feels in profile. If you are restoring a car for shows or aiming for a factory-correct visual statement, match the sidewall style to the era and to the specific presentation you want, then confirm that the tire you select carries the same 9.15-15 sizing.
What brands make tires for 1966 Imperial vehicles?
1966 Imperial vehicles are served through the 9.15-15 classic tire market rather than a broad range of modern mainstream fitments. Because the Imperial was a premium American luxury car, buyers typically focus on reproduction and collector-oriented tire lines that preserve the correct size format and period appearance instead of searching for a late-model equivalent.
Brand choice on a collector car like a 1966 Imperial usually comes down to restoration goals, sidewall styling, and how closely you want the finished car to reflect the look of the era. Once you have confirmed 9.15-15 as the right size, compare the available classic tire offerings within that format rather than substituting a modern tire just because it is easier to find.
How do I choose the right tire style for a 1966 Imperial?
A 1966 Imperial uses a single bias-ply size, so the decision is about tire character and appearance rather than choosing among multiple factory sizes. Bias-ply construction is the historically appropriate format for a car of this age and class, and it preserves the visual profile and road manners most owners expect from a mid-1960s luxury car.
Start by deciding whether your Imperial is being restored for originality, shown regularly, or driven more casually on local roads and events. Then weigh sidewall style, overall appearance, and how closely you want the car to reflect period practice. That approach is more useful on a 1966 Imperial than trying to force a modern replacement logic onto a classic full-size chassis.
Fitting & Setup
Do 1966 Imperial tires require inner tubes?
Inner tube use on a 1966 Imperial depends on the specific tire and wheel combination rather than on the year and make alone. The shared 9.15-15 size is the starting point, but tube-type versus tubeless construction can vary within classic tire applications, and wheel condition also affects the decision. Older wheels that are pitted, damaged, or not suitable for tubeless sealing may require a different approach.
Before mounting new tires, check the tire’s sidewall marking and confirm whether your wheels are appropriate for the construction you plan to run. A restorer or tire professional familiar with collector vehicles can help evaluate the wheel itself, including valve stem area and bead condition, so the finished setup matches both the tire design and the car’s intended use.
Can the original 1966 Imperial wheels be used with the 9.15-15 tire size?
Yes, the original-style 15-inch wheels used on a 1966 Imperial are the proper diameter for the 9.15-15 tire size. Since both the sedan and convertible share that same tire size, there is no year-and-make conflict at the wheel diameter level when using original-equipment-type wheels. The basic tire-to-wheel diameter relationship is therefore straightforward.
Condition still matters on a car of this age. Before mounting fresh tires, inspect the wheels for corrosion, bent flanges, previous repairs, and any signs that the car has been altered over time. That extra step helps ensure the tire seats correctly and preserves the ride quality and road manners an Imperial owner is usually trying to maintain.
Maintenance, Storage & Longevity
How should I store a 1966 Imperial when the tires are fitted?
A 1966 Imperial should be stored in a cool, dry space away from direct sunlight, electric motors, generators, battery chargers, and other ozone-producing equipment that can age rubber prematurely. Because it uses bias-ply tires, long static storage can also encourage temporary flat-spotting more readily than many radials. Clean, stable flooring and consistent air pressure help reduce stress during storage.
If the car will sit for extended periods, move it occasionally to change the contact patch or place it on stands if that fits your storage routine and suspension goals. A large, heavy luxury car puts real load on its tires even when parked, so good storage habits make a visible difference in how the tires look and feel when driving season returns.
How long do tires on a 1966 Imperial typically last?
Tires on a 1966 Imperial should be judged more by age, condition, and storage history than by mileage alone. Collector vehicles often accumulate very few miles, yet the rubber can still age out. A good working rule is to begin careful evaluation around the five- to seven-year range and to treat roughly ten years as a point where replacement deserves serious consideration, regardless of tread depth.
Check the date code and inspect for sidewall cracking, hardening, irregular wear, and any change in ride quality or vibration. An Imperial may look road-ready because it has been preserved cosmetically, but old tires can still undermine comfort and safety. On a car driven only occasionally, calendar age matters far more than odometer readings.
How often should tires on a 1966 Imperial be inspected?
Tires on a 1966 Imperial should be inspected before every drive and again before any longer outing or event weekend. Look for cracking in the sidewalls, weathering around the tread, low pressure, bulges, punctures, and uneven wear. Since many collector cars spend time parked, a quick pre-drive check is especially important even when the car ran well on its last outing.
On a full-size luxury car, proper tire condition has a big effect on ride smoothness and steering feel, so small issues are often noticeable early. If your setup uses tubes, include the valve stems and any signs of slow leakage in your routine inspection. A few minutes in the garage can prevent roadside trouble and protect wheels that may be difficult to replace.
Restoration & Authenticity
What tires were originally fitted to the 1966 Imperial All Sedans?
A 1966 Imperial All Sedans application uses the 9.15-15 size, and bias-ply construction is the era-correct type for a car from this point in the American luxury market. That matches what buyers expect to see on a mid-1960s Imperial in restored form. Original-equipment branding could vary by market, supplier, or production practice, so the most reliable anchor point is the correct size and construction type.
For a factory-minded restoration, start with a 9.15-15 bias-ply tire and then refine the choice around sidewall appearance and the standards of the event where the car will be judged. If your sedan has unusual history or appears to have been delivered in a special market configuration, marque clubs and original literature are the best places to confirm finer points.
Does correct tire fitment matter for showing a 1966 Imperial?
Correct tire fitment matters quite a bit when showing a 1966 Imperial, especially because the car’s size, stance, and upscale styling make the tires easy to notice. Judges and knowledgeable enthusiasts often pay attention to whether the tire size, construction type, and sidewall treatment look appropriate for the year. A modern-looking substitute can change the visual balance even if it physically fits the wheel.
For most show-oriented owners, the safest approach is to keep the 9.15-15 size and stay with a period-appropriate bias-ply presentation. Sidewall style should also match the image you are restoring, since a luxury marque like Imperial was strongly defined by curb appeal. Event-specific judging standards can vary, so consult the relevant club or judging manual before finalizing details.
Why is bias-ply fitment important on a 1966 Imperial restoration?
Bias-ply fitment matters on a 1966 Imperial restoration because it is part of how the car originally looked and behaved on the road. The tire profile, sidewall shape, and overall stance of a bias-ply tire complement the design language of a mid-1960s Imperial in a way that many later tire formats do not. That visual relationship is especially important on a car known for formal luxury presence.
Owners restoring for authenticity usually want the tire to support the car’s original personality rather than reinterpret it. Keeping the correct 9.15-15 bias-ply format helps preserve that impression from the first glance. If your goal is judged originality, period photography, marque references, and event standards will help you refine sidewall style and presentation beyond the basic size itself.
Safety & Road Use
Are 1966 Imperial tires safe for highway driving?
A properly manufactured, properly mounted, and properly maintained 9.15-15 tire can be suitable for normal road use on a 1966 Imperial when it is used within the tire’s intended limits and in sound condition. Because this application is rooted in classic bias-ply construction, safe highway use depends as much on age, inflation, wheel condition, and overall vehicle health as it does on the tire size itself.
A 1966 Imperial is a large, heavy luxury car from an era with very different braking, suspension, and steering expectations than modern traffic assumes. Before regular highway use, make sure the whole car is ready for that pace, not just the tires. A fresh set of correctly sized tires helps, but it should be part of a broader mechanical readiness check.
What inflation pressure should I use for 1966 Imperial tires?
Inflation pressure for 1966 Imperial tires should be set with the specific tire manufacturer’s guidance in mind and checked against the vehicle’s original factory recommendations where available. The 9.15-15 size establishes the fitment, but pressure should never be copied casually from another tire just because the size appears similar. Tire construction, intended load, and reproduction design details can influence the correct working pressure.
Use the owner’s manual, door-jamb information if present, and the tire maker’s recommendations together rather than relying on guesswork. That approach is especially important on a heavy luxury car, where pressure affects ride quality, steering response, and tread wear. Once the tires are mounted, recheck pressure regularly, since collector cars often sit long enough for small pressure losses to go unnoticed.
What should I check before taking a 1966 Imperial on a longer drive?
Before a longer drive in a 1966 Imperial, inspect each tire for cracking, cuts, bulges, uneven wear, and proper inflation, and make sure the spare is usable as well. Check valve stems, wheel condition, and any signs of slow air loss. A quick tread and sidewall inspection is especially worthwhile on a collector car that may look excellent cosmetically but spend much of its life parked.
The tires are only one part of a sensible pre-trip check on a car of this age. Brakes, cooling, steering, suspension, and fluid condition should all be reviewed before asking a mid-1960s luxury car to cover distance. When the basics are handled ahead of time, the Imperial is far more likely to deliver the calm, effortless touring experience it was built to provide.
