By 1977, Aston Martin occupied a rare place in the market, building hand-finished grand touring cars with British character, V8 power, and an unmistakably exclusive presence. A 1977 Aston Martin carried the kind of long-legged road manners and bespoke feel that make tire choice especially important today, whether the car is kept for touring, preservation, or occasional show use. For this year and make, one model uses a single GR70-15 tire size, so the decision is less about comparing fitment options and more about choosing the right radial construction and sidewall appearance within that size. Before choosing a tire, confirm that your car is the 1977 Aston Martin AM and that your 15-inch wheels match the intended fit.
Which Tire Size Is Right for Your 1977 Aston Martin
The 1977 Aston Martin range uses one tire size: GR70-15, and it applies to the sole AM model for the year. That means the main decision is not between different fitment sizes, but between radial products in the same size with different visual treatments and wheel-width requirements. Understanding that distinction before choosing a product saves time and helps ensure the right match.
Year(s): 1977|Fit(s): AM|Construction: Radial|Rim: 15 in
GR70-15 is an alphanumeric radial size, with the lettered prefix identifying its era-specific sizing class, the 70 denoting a low-profile series, and the 15 indicating a 15-inch rim. This size is available from Goodyear in Bias Look Radial construction with Pin-White-Stripe and RWL sidewall styles, and the wheel-width requirement ranges from 7.0 to 8.0 inches depending on the product. Because GR70-15 is the only size used on the 1977 Aston Martin AM, the practical choice comes down to the sidewall look you want and matching the tire to the actual wheel width on the car.
One model is covered for 1977 Aston Martin. Because the year uses a single tire size across the range, identifying the model is straightforward, and the more meaningful choice is how closely you want the tire's appearance to align with the car's original late-1970s grand touring character. Select the model below for model-specific fitment history and products.
1977 Aston Martin AM
The 1977 Aston Martin AM represents the marque's late-classic era of coachbuilt British grand touring, where luxury, speed, and exclusivity were expected to coexist. Its tires mount on 15-inch wheels, and the GR70-15 fitment suits the period look of a substantial GT while still giving you a radial construction that feels appropriate for real road use.
Four products are available across one tire size for 1977 Aston Martin vehicles. GR70-15 includes four Goodyear Bias Look Radial choices with Pin-White-Stripe and RWL sidewall styles, so the key step is confirming the look you want and matching the tire to your wheel width.
Goodyear Tires
Goodyear GM Custom Tread Pin White Stripe | GR70-15
These FAQs cover the single GR70-15 fitment used on 1977 Aston Martin models, including what the size code means, how the available sidewall styles compare, what wheel widths apply, and how to care for collector-car tires between drives.
Size Basics & Fitment
What tire sizes fit 1977 Aston Martin vehicles?
1977 Aston Martin vehicles use one tire size: GR70-15. That size applies to the 1977 Aston Martin AM, mounts on a 15-inch rim, and appears across products that fit wheel widths from 7.0 to 8.0 inches, with one product calling for an 8-inch rim and another covering 7.50 to 8.0 inches.
Because there is only one fitment size for the year and make, the buying decision is mostly about selecting the right version of GR70-15 for your wheels and the sidewall appearance you want. It is still smart to verify the actual wheel width on the car before ordering, especially on a hand-built grand tourer where wheels may have been changed at some point in the car's life.
What does GR70-15 mean on a 1977 Aston Martin tire?
GR70-15 is an alphanumeric radial size used widely in the 1970s. The G identifies the tire's period sizing class, R signals radial construction in this format, 70 indicates a low-profile series, and 15 is the rim diameter in inches. For a 1977 Aston Martin, that means the tire is built for a 15-inch wheel and reflects the sizing language common to late-classic performance and luxury cars.
That code matters because a modern metric size may look similar in overall proportions while still changing the car's appearance or fit on the wheel. If your goal is to keep the visual character of a late-1970s Aston Martin intact, staying with the correct alphanumeric GR70-15 format is usually the most direct path before narrowing your choice by sidewall style and wheel-width compatibility.
Do all 1977 Aston Martin models use the same tire size?
Yes. The 1977 Aston Martin model range covered here uses the same GR70-15 tire size on the AM model. There is no second fitment size to sort through at the year-and-make level, which makes this one of the more straightforward classic Aston Martin tire searches.
That does not mean every tire choice looks the same once mounted. Sidewall treatment still changes the presentation of the car, and wheel width still needs to be checked against the specific GR70-15 product you choose. Once those two points are confirmed, the fitment path is much simpler than on year-make pages with multiple model-specific sizes.
Buying the Right Tire
What sidewall styles are available for 1977 Aston Martin tires?
1977 Aston Martin GR70-15 tires are available with Pin-White-Stripe and RWL sidewall styles. Both are late-1970s visual treatments, but they create different impressions on the car. A pin white stripe gives a cleaner, more formal luxury-GT presentation, while raised white letters lean more toward a performance-oriented period look.
Choosing between them is largely an appearance decision rather than a fitment one, since both styles exist in the same size. Buyers restoring a car to a very specific market delivery or event standard should compare the sidewall look against period photos, surviving cars, and marque-club guidance. For a driver, either style can be appropriate if it matches the character you want the car to project.
What brands make tires for 1977 Aston Martin vehicles?
Goodyear makes the available GR70-15 tires for 1977 Aston Martin applications here, with products from the GM Custom Tread, Steelgard, and Custom Wide Tread families. All of them use Bias Look Radial construction, which combines a period-style appearance with radial internal design.
With a single brand covering the size, the real comparison is between series, sidewall styling, and wheel-width fit. That can actually simplify the search for a late-classic Aston Martin, since you are not sorting through multiple competing size interpretations. Focus first on the look you want, then confirm that the wheel width on your car falls within the range recommended for the specific tire.
What is the difference between Goodyear Steelgard and Goodyear GM Custom Tread tires for the 1977 Aston Martin?
For the 1977 Aston Martin in GR70-15, Goodyear Steelgard appears in both RWL and Pin-White-Stripe versions, with weights around 29 to 30 pounds and wheel-width fitments of 8 inches or 7.50 to 8.0 inches depending on the version. Goodyear GM Custom Tread also appears in Pin-White-Stripe form at 29 pounds and 7.0 to 8.0 inches, while the Goodyear Power GM Custom Tread RWL carries a 7.0 to 8.0 inch fitment and a lighter 22-pound weight.
Those distinctions matter most if you are trying to match a particular sidewall look or wheel width rather than chasing a different nominal size. On a 1977 Aston Martin, the safest approach is to compare the exact wheel width on the car against the product's approved range, then choose the series and sidewall treatment that best suits your restoration goal or road-going presentation.
Fitting & Setup
What rim width do 1977 Aston Martin tires require?
GR70-15 tires for 1977 Aston Martin applications fit within a fairly tight wheel-width range, but the exact requirement varies by product. Some versions fit 7.0 to 8.0 inch rims, one fits 7.50 to 8.0 inch rims, and one is specified for an 8-inch rim. All use a 15-inch rim diameter.
That means you should not assume every GR70-15 is interchangeable just because the size code matches. Measure the wheel width on the car, or confirm it through the wheel manufacturer or a knowledgeable Aston Martin specialist, before making a final choice. This is especially important on collector cars that may have received replacement or aftermarket wheels over the years.
Can the original 1977 Aston Martin wheels be used with all 1977 Aston Martin tire choices?
A 1977 Aston Martin using the original GR70-15 fitment will still need 15-inch wheels, and every available tire in this size is built for that same rim diameter. Diameter compatibility is straightforward, but wheel-width compatibility changes slightly from one product to another within the GR70-15 category.
Original wheels can often be retained, but the right next step is to verify their actual width before settling on a specific tire. If your wheels fall at the narrow or wide end of the range, that may steer you toward one GR70-15 product rather than another. It is a small detail, yet it prevents avoidable fitment problems on a valuable hand-built car.
Maintenance, Storage & Longevity
How should I store a 1977 Aston Martin when the tires are fitted?
A 1977 Aston Martin should be stored in a cool, dry space away from direct sunlight, electric motors, battery chargers, welders, and other ozone-producing equipment that can accelerate sidewall aging. Keep the tires properly inflated, and if the car will sit for an extended period, move it occasionally or support it in a way that reduces long-term flat-spotting stress.
Radial tires generally tolerate storage better than old-style bias-ply tires, but collector-car habits still matter more than construction alone. Clean, stable indoor storage and periodic movement go a long way toward preserving both ride quality and appearance. If the car spends much of its life under a cover, make sure the cover does not trap moisture around the lower body and tire area.
How long do tires on a 1977 Aston Martin typically last?
On a 1977 Aston Martin, tire age is usually more important than mileage because many collector cars are driven sparingly. A sensible rule is to begin evaluating tires closely around five to seven years of age and to treat roughly ten years as a serious replacement point, regardless of remaining tread. The DOT date code on the tire sidewall is the best starting point for that timeline.
A car that looks lightly used can still be riding on hardened, aging rubber that no longer behaves the way it should at speed or under braking. If the tires are older and the car is returning to regular road use, replacing them is often part of recommissioning rather than a tread-wear decision. Age, storage history, and visible condition should drive the decision more than miles driven.
How often should tires on a 1977 Aston Martin be inspected?
Tires on a 1977 Aston Martin should be inspected before every drive and again before any longer outing. Check air pressure, sidewall cracking, tread wear, cuts, bulges, and any sign that the tire is not holding its shape evenly on the wheel. On a collector GT, a visual walkaround before startup is one of the simplest and most valuable habits you can build.
Long intervals between drives can hide slow pressure loss or age-related cracking until the car is finally back on the road. A pre-drive inspection also gives you a chance to catch problems with the spare and to look at valve stem condition while the car is stationary. That small routine is especially worthwhile before highway use, touring events, or any trip far from home.
Restoration & Authenticity
What tires were originally fitted to the 1977 Aston Martin AM?
A 1977 Aston Martin AM would have been associated with radial-era fitment, and GR70-15 reflects the period-correct alphanumeric sizing language used on many late-1970s premium and performance cars. The available replacements stay within that same GR70-15 format and use Bias Look Radial construction, which preserves a strong period appearance while remaining true to the car's radial-era character.
Original-equipment branding could vary by market, supply, and individual car history, so the best confirmation for a concours-level restoration comes from factory literature, surviving delivery records, and Aston Martin marque specialists. For most restorations, getting the size format, radial construction character, and sidewall style right will matter more than chasing an unverified original brand assumption.
Does correct tire fitment matter for showing a 1977 Aston Martin?
Yes, correct tire fitment matters on a shown 1977 Aston Martin because judges and knowledgeable enthusiasts notice size format, construction appearance, and sidewall styling. A tire that departs from the GR70-15 period code or uses a sidewall treatment that clashes with the car's intended presentation can stand out even when the rest of the restoration is carefully executed.
The level of scrutiny depends on the event. A local show may be forgiving, while marque or concours judging can be much stricter about details that affect authenticity. If the car is being prepared for serious judging, compare your tire choice against period photography and event standards, then consult Aston Martin clubs or historians before settling on the final sidewall style.
What is the difference between Goodyear Steelgard and Goodyear GM Custom Tread tires for the 1977 Aston Martin in a restoration context?
In restoration terms, the difference is less about size and more about presentation. Goodyear Steelgard comes in both RWL and Pin-White-Stripe forms, with fitments of either 8 inches or 7.50 to 8.0 inches depending on version, while Goodyear GM Custom Tread appears in Pin-White-Stripe form with a 7.0 to 8.0 inch range. All keep the GR70-15 size and Bias Look Radial character intact.
That means the choice should follow the visual story you are trying to tell with the car. A white stripe may suit a more formal grand-touring presentation, while raised white letters can give the car a stronger late-1970s performance flavor. When originality matters, use period images and show standards to decide which look is more convincing for your specific Aston Martin.
Safety & Road Use
Are 1977 Aston Martin tires safe for highway driving?
A properly matched, properly inflated GR70-15 radial tire in sound condition can be appropriate for normal highway driving on a 1977 Aston Martin. The available choices are radial designs with period-style appearance, which suits the grand-touring role of the car. On a vehicle of this age, overall roadworthiness depends just as much on brakes, suspension, steering, and alignment as it does on the tire itself.
Safety comes from the complete package rather than the size code alone. Before any sustained highway use, make sure the tires are age-appropriate, free of cracking or bulges, and mounted on wheels that match the tire's approved width range. A well-sorted late-1970s Aston Martin should feel composed on the road, but only if the whole chassis and tire system has been checked as a unit.
What inflation pressure should I use for 1977 Aston Martin tires?
The right inflation pressure for a 1977 Aston Martin should come from the car's factory guidance first, then be checked against the tire manufacturer's information for the specific GR70-15 product you choose. Because several GR70-15 options exist with different wheel-width requirements and construction details, pressure should not be copied casually from another tire just because the nominal size is the same.
Start with the owner's manual, factory placard, or trusted Aston Martin literature, then confirm that the pressure strategy makes sense for the exact tire on the car. Pressure influences ride, steering feel, tread wear, and heat buildup, all of which matter on a heavy, high-speed GT. Use an accurate gauge, check pressures cold, and revisit them if the car's usage changes from local drives to longer touring work.
What should I check before taking a 1977 Aston Martin on a longer drive?
Before a longer drive in a 1977 Aston Martin, inspect each tire for cracking, cuts, bulges, irregular wear, and correct cold pressure. Confirm that the GR70-15 tires are mounted on wheels within the approved width range for the exact product, and make sure the spare is serviceable as well. A visual check of valve stems and a quick look for any sign of air loss should be part of that routine.
Tire condition is only one part of preparing a late-1970s grand tourer for distance. Fluids, belts, hoses, brakes, and cooling system health deserve the same attention before you head out. When the tire choice, wheel fit, and mechanical condition are all in order, the car is far more likely to deliver the kind of composed long-distance experience Aston Martin was known for.
