AC Cobra Tires

AC Cobra uses two listed tire sizes across the 1963 through 1966 production run: 640-15 and 670-15. Both sizes are period numeric bias-ply sizes built for 15-inch rims. The 640-15 products are generally associated with narrower rim widths, while 670-15 products are generally associated with slightly wider rim widths and a broader section profile.

That means year alone does not settle the choice, because both sizes appear throughout the full AC Cobra production span covered here. The practical way to choose is to inspect the wheel width already on the car, compare it with the recommended rim-width ranges of the available tires, and decide whether the goal is a narrower or wider period-correct stance.

On an AC Cobra, 640-15 is an older numeric bias-ply size. The 640 portion represents a nominal section width of roughly 6.40 inches, and the 15 indicates a 15-inch rim diameter. The products available in this size are bias-ply tires, including blackwall and whitewall variations from several brands.

Understanding that older size code helps prevent a common fitment mistake, because it is a width-and-rim designation rather than a modern metric description. If your AC Cobra has narrower wheels or you are aiming for the slimmer of the two listed period sizes, 640-15 is the size to compare first against the actual wheel width on the car.

A 1965 AC Cobra has two listed sizes because both 640-15 and 670-15 were used during the same model year, and the same pattern appears for 1963, 1964, and 1966 as well. The split is not a rim-diameter change, since both sizes use 15-inch wheels. It is a same-year fitment choice tied to overall tire width and wheel specification.

That is why a single year-based lookup is only a starting point for an AC Cobra. To choose correctly, compare the wheel width on the car with the recommended rim-width ranges of the available tires, then decide whether you are preserving an existing setup or changing the look and feel with the narrower or wider period size.

The AC Cobra sizes listed here are both numeric bias-ply tires, and those products should be treated as tube-type applications. The available 640-15 and 670-15 offerings are bias-ply constructions rather than modern tubeless radials. For a collector car of this era, inner tubes are part of the normal fitment approach when using these period-style tires.

That matters because tube choice and wheel condition go hand in hand on an AC Cobra. Before mounting new tires, inspect the inside of each wheel for rust, burrs, or damage that could affect the tube, and make sure the wheel width is appropriate for the selected size so the tire keeps its intended shape and load behavior.

A 1964 AC Cobra can use either 640-15 or 670-15, and both are 15-inch bias-ply sizes. The most direct way to confirm the correct choice is to inspect the wheel width on the car and compare it with the tire's recommended rim-width range. In the available products, 640-15 generally suits narrower wheel widths, while 670-15 generally suits wider ones.

Original paperwork, restoration records, and long-term ownership history can also help if the car has stayed consistent over time. If your AC Cobra has changed wheels, suspension stance, or overall presentation during restoration, judge the tire by the wheel actually on the car rather than assuming the same size belongs on every example from that year.

AC Cobra tire offerings here include blackwall, narrow whitewall, and wide whitewall sidewall styles. Both 640-15 and 670-15 have blackwall choices, and whitewall options appear in multiple widths depending on brand and series. That gives AC Cobra owners room to match a competition-oriented appearance, a more touring-oriented look, or a specific restoration theme.

Most enthusiasts associate AC Cobra with a purposeful blackwall presentation, especially on performance-focused builds, while whitewalls create a distinctly different period impression. The right choice depends on how the individual car is being restored or presented, so it helps to compare the sidewall style to the car's wheels, trim, and the era-specific look you want to preserve.

The AC Cobra tire options listed here come from BFGoodrich, Firestone, Avon, Excelsior, US Royal, Coker Classic, Universal Vintage Tire, Goodyear, and STA. Those brands are spread across the two listed sizes, with especially broad coverage in 670-15. The mix includes both mainstream American collector-tire names and specialty vintage tire lines.

Brand choice on an AC Cobra often comes down to visual style, preferred series, and how closely you want the tire to align with the car's intended personality. Some owners prioritize a plain blackwall sporting look, while others are matching a restoration theme that calls for a specific whitewall width or a particular period-style tread family.

AC Cobra tire offerings here span several series, including Silvertown Classic Bias Ply, Firestone Classic Bias Ply, Super Safety Crossply, Excelsior Bias Ply, US Royal Classic Bias Ply, Coker Classic Bias Ply, Universal Classic Bias Ply, Turbospeed Mk4, Super Cushion, Custom Super Cushion, Super Cushion Deluxe, and Super Transport. Most are passenger-car bias-ply series, while others reflect more specialized performance or duty themes. The series names mainly distinguish brand family, tread pattern, sidewall presentation, and intended character within period-style bias-ply construction.

For an AC Cobra, that means the right series is not only about size but also about the kind of car you are presenting. A road-going restoration, a competition-influenced build, and a show car with prominent whitewalls may all point toward different series even when the numerical size remains the same.

An AC Cobra should be stored in a cool, dry, dark garage away from direct sunlight, ozone sources, and large temperature swings. Keep the tires clean, avoid petroleum-based dressings, and maintain inflation appropriate to the tire and the car's stored condition. If the car sits for long stretches, moving it periodically helps reduce flat spotting common to bias-ply collector tires.

Long-term storage practices matter because AC Cobra tires are part of the car's appearance and road behavior, not just a consumable part. Owners who want to preserve ride quality and sidewall condition often store the car on clean surfaces, keep weight distribution even, and inspect the tread and sidewalls whenever the car comes back into regular seasonal use.

Tires on an AC Cobra should be inspected before every drive and more thoroughly several times during the driving season. Check inflation, sidewall cracking, cuts, tread separation, uneven wear, and any signs of tube or wheel-related issues around the bead area. Bias-ply tires on a high-performance collector car deserve frequent visual inspection even when annual mileage is low.

That routine is especially important because collector cars can sit for long periods and then return to use without warning signs obvious from the driver's seat. A close walk-around before driving helps catch aging, underinflation, or mounting problems early, and it is wise to inspect the spare and valve hardware at the same time so the whole tire package stays serviceable.

AC Cobra tires should be replaced when age, cracking, hardening, bulges, vibration, irregular wear, or structural concerns appear, even if tread depth still looks respectable. Collector-car tires often age out before they wear out, especially when the car is driven sparingly. Visible tread alone is not a reliable indicator of serviceability on an older bias-ply tire.

That is why an AC Cobra owner should treat calendar age and condition as seriously as mileage. If the tire's behavior changes, the sidewalls show age-related distress, or the car has been stored for long periods, replacement becomes the prudent choice so the car keeps the period look without relying on rubber that no longer performs as intended.

AC Cobra is associated here with two period-style sizes, 640-15 and 670-15, both offered in bias-ply construction and in multiple series and sidewall styles. Those offerings show that more than one period-appropriate approach exists rather than a single one-size answer for every AC Cobra. The available series include sporting blackwalls as well as whitewall variations, depending on the look being recreated.

For a restoration, the most accurate reference is the specific car's history, surviving original components, and marque literature tied to its exact configuration. That is particularly important with AC Cobra because the same production years are linked to both listed sizes, so authenticity depends on the individual car rather than a simple year-only rule.

Correct tire fitment can absolutely affect the value, presentation, and judging results of an AC Cobra. Size, sidewall treatment, and overall tire profile influence stance and visual balance, and judges often notice whether the car sits as expected for its era and intended configuration. Even when the wheel diameter is correct, the wrong section width or sidewall style can change the car's appearance considerably.

That means tire choice should be treated as part of the restoration plan rather than an afterthought. If the goal is concours accuracy or strong market presentation, compare the selected AC Cobra tire to period photos, established marque references, and the standards used by clubs or events where the car will be shown.

AC Cobra tire choices here include blackwall, narrow whitewall, and wide whitewall styles. Blackwall is the sidewall style most closely aligned with the AC Cobra's hard-edged sports-car character, while the whitewall options reflect alternate period presentations available in the same sizes. The sidewall style therefore affects the tone of the restoration as much as the tire size itself.

For a serious restoration, choose the sidewall style that matches the exact story of the car you are presenting. A competition-influenced AC Cobra generally looks most natural on blackwalls, while a car restored to a more personalized or showroom-style period appearance may justify a whitewall if supporting photos, ownership history, or event goals point that way.

These AC Cobra tires are purpose-built collector tires and can be used on public roads when they are correctly sized, properly mounted, in sound condition, and matched to a mechanically healthy car. The listed products are bias-ply designs, so they deliver period behavior rather than the responses of a modern radial performance tire. Safe road use depends as much on condition and setup as on the tire itself.

An AC Cobra has enough power and character that tire choice deserves respect. Keep expectations aligned with vintage handling, maintain appropriate inflation, and make sure the car tracks straight and brakes evenly before any serious outing, especially if the car has been dormant or recently restored.

Before driving an AC Cobra, check tire inflation, visible sidewall and tread condition, wheel security, and any signs of leaks or tube-related air loss. Also look for flat spotting from storage, uneven wear, or contact marks that suggest a mismatch between tire width and wheel or body clearance. A quick inspection is especially important with bias-ply tires because they can telegraph storage and alignment issues differently than modern radials.

A short, careful shakedown drive after inspection is a smart habit for an AC Cobra that is not used daily. If the steering feels unusual, the car wanders, or vibration appears, stop and investigate before continuing, since small setup problems in a powerful vintage sports car can become much more serious once speed rises.

An AC Cobra on period-style bias-ply tires should be driven at speeds appropriate to the tire's vintage design, the car's condition, and road conditions rather than to the engine's capabilities alone. Bias-ply tires do not react like modern high-performance radials in transient handling, braking feel, or straight-line stability. The practical limit is set by the complete package, not simply by the badge on the car.

For most owners, that means building speed gradually and treating the car with respect even when the tires are new. If the AC Cobra is used for touring, show driving, or occasional spirited runs, the best approach is to stay well within the comfort range of the chassis, steering, brakes, and tire construction rather than exploring the upper edge of the car's reputation.