1965 AC Cobra Tires

The 1965 AC Cobra uses two primary tire sizes: 640-15 and 670-15. Both are vintage numeric bias-ply sizes designed for 15-inch rims, and the covered Base sub-model is associated with both of them rather than one single universal fitment.

That means the right replacement starts with confirming which wheel and tire setup is already on the car. A Cobra that currently uses 640-15 should stay within that fitment path unless you have carefully checked wheel width, tire dimensions, and clearance, while a car set up for 670-15 should be evaluated within that wider primary size range.

The primary tire fitments for the 1965 AC Cobra use a 15-inch rim diameter. Both 640-15 and 670-15 are built around that same 15-inch wheel size, so rim diameter remains consistent even though the two tire sizes differ in nominal section width.

Rim diameter is only the starting point, though, because wheel width still matters when choosing among available tires or considering a radial equivalent. On a Cobra with aftermarket wheels or an older restoration, it is smart to confirm both the actual wheel diameter and width before ordering tires in either of the original bias-ply size families.

Both 640-15 and 670-15 are vintage numeric bias-ply tire sizes. In this format, the first number represents the tire’s nominal section width with the decimal omitted, so 640 is about 6.40 inches and 670 is about 6.70 inches, while 15 refers to the wheel diameter in inches.

That older sizing system helps explain why these tires look different from modern metric radials even when they share the same rim diameter. Understanding the format makes it easier to compare period-style bias-ply options, evaluate radial equivalents carefully, and avoid assuming that any modern 15-inch tire automatically matches the Cobra’s original fitment profile.

Both 640-15 and 670-15 are primary bias-ply tire sizes for the 1965 AC Cobra. They use a vintage numeric size format and keep the car within its traditional 15-inch fitment pattern rather than starting with a modern radial as the original tire construction choice.

That matters because construction affects both appearance and the way the tire sits within the overall presentation of the car. A buyer deciding between new tires should first choose whether to preserve a period-style bias-ply setup or investigate radial-equivalent sizes, then confirm wheel width, overall dimensions, and clearance before moving away from the original construction type.

For 640-15, radial equivalents include 175R15, P175/75R15, and P185/70R15. For 670-15, radial equivalents include 195R15, P205/75R15, P215/70R15, and 670R15, with 670R15 serving as the bias-look radial option among that group.

Those equivalents give the 1965 AC Cobra owner several ways to compare modern radial sizing, from Euro-metric to P-metric formats and, in the case of 670R15, a more traditional visual presentation. The recommended rim-width ranges are 5-6 inches for 640-15 and 5-7 inches for 670-15, so wheel compatibility and vehicle clearance should be checked before converting.

Start by matching the radial equivalent to the original primary size on the car, then verify the wheel diameter and wheel width against that equivalent’s recommended range. For a 1965 AC Cobra, that means confirming whether the car is set up around 640-15 or 670-15 before comparing options such as 175R15, P175/75R15, P185/70R15, 195R15, P205/75R15, P215/70R15, or 670R15.

A construction change should also include a careful check of tire-to-body and tire-to-suspension clearance at full steering lock and through suspension movement. Older sports cars are often restored, modified, or fitted with replacement wheels over time, so it is worth inspecting the complete setup rather than assuming a radial equivalent will behave exactly like the original bias-ply tire.

The first decision is confirming whether your 1965 AC Cobra uses 640-15 or 670-15, since both are primary bias-ply fitments on 15-inch rims. Once the correct size is established, the selection process becomes a matter of construction preference, sidewall style, brand, tire series, and the wheel-width requirements of the specific tire you are considering.

A restoration-oriented Cobra may call for a very different visual presentation than a car intended for regular touring. Blackwall, narrow whitewall, and wide whitewall choices are all available in these size families, and some owners may also compare radial equivalents, so it helps to balance appearance goals with wheel compatibility and the actual way the car will be used.

1965 AC Cobra tires are available in blackwall, narrow whitewall, and wide whitewall styles across the applicable 640-15 and 670-15 bias-ply offerings. The exact sidewall treatment depends on the tire size and product line, with 670-15 generally opening the broadest range of visible styling choices.

Sidewall style changes the personality of the car more than many buyers expect, especially on an open sports car where the tire is always in view. A blackwall usually gives the cleanest competition-inspired presentation, while narrow and wide whitewalls push the look in a more formal or period-styled direction, so the right choice depends on the Cobra’s intended visual character.

Applicable 1965 AC Cobra tires come from BFGoodrich, Firestone, Avon, Excelsior, US Royal, Universal Vintage Tire, Coker Classic, Goodyear, and STA. Brand availability varies by size, with 670-15 carrying the widest assortment and 640-15 offering a smaller but still meaningful mix of traditional bias-ply choices.

Brand alone should not make the decision. It is more useful to compare each tire within the correct size by sidewall treatment, tire series, rim-width specification, weight, and load information where available, then choose the option that best matches your Cobra’s wheel setup, period-style goals, and expected road use.

A period-style 1965 AC Cobra tire choice starts with the original bias-ply fitment path, either 640-15 or 670-15 depending on the setup already on the car. Staying within those vintage numeric bias-ply sizes preserves the traditional sizing language and visual character that suit a mid-1960s sports car.

From there, appearance becomes a matter of sidewall treatment and series selection rather than size alone. Blackwall choices usually keep the look lean and purposeful, while whitewall treatments create a different visual tone, so buyers pursuing exact historical authenticity should compare their car against marque-specific references before settling on a final presentation.

Tire construction changes more than ride and handling impressions on a restored 1965 AC Cobra; it also changes the visual stance of the car. A bias-ply tire keeps the Cobra within its original-style construction family, while a radial alternative introduces a more modern format even when chosen as an equivalent size.

That distinction matters on a car with such minimal bodywork and exposed wheel presence. Owners who want a restoration-oriented look often stay with bias-ply or, in the case of a 670-15 setup, may at least consider the 670R15 bias-look radial, while anyone chasing exact authenticity should verify details through Cobra-specific historical sources.

Yes. Modifications can change tire fitment on a 1965 AC Cobra even when the tire size itself looks correct on paper. Aftermarket wheels, altered wheel widths, suspension changes, ride-height adjustments, or body modifications can all affect how a 640-15, 670-15, or any radial equivalent sits in relation to steering and body clearance.

That is why a modified Cobra should be measured rather than treated like a stock reference car. Confirm the actual wheel diameter and width, inspect clearance at full lock, and make sure the tire choice matches the car’s real-world setup, especially if the vehicle has been restored over many years or changed hands several times.

Before driving a 1965 AC Cobra on new tires, inspect wheel condition, lug hardware, inflation pressure, valve stems, and basic tire seating on the rim. It is also smart to check for adequate clearance around suspension components and bodywork, particularly because the Cobra’s compact dimensions leave little room for assumptions.

A short, careful road test should follow any tire installation, with attention paid to steering feel, rubbing, vibration, and air retention after the first miles. On a collector car, it also makes sense to inspect the rest of the chassis at the same time, since worn bushings, alignment issues, or old suspension parts can affect how fresh tires behave.

Collector-car tires on a 1965 AC Cobra should be checked regularly for air pressure, tread condition, sidewall cracking, bulges, cuts, and signs of uneven wear. Even if the car is driven sparingly, 640-15 and 670-15 tires still age over time, so low mileage should never be treated as proof that an older tire remains road-ready.

Storage conditions matter as much as mileage on a lightly used Cobra. Keeping the car away from prolonged sunlight, excess heat, moisture, and ozone sources can help preserve the tires, and periodic inspection remains important before any extended drive, especially on a vintage sports car that may spend long stretches parked between outings.