1948 AC Tire Fitment Guide

1948 AC vehicles in this range use one tire size: 550-17. That size applies to the 1948 AC Saloon, and it is a bias-ply fitment mounted on a 17-inch rim. Available versions of 550-17 include Blackwall, Wide Whitewall, and Double-Whitewall sidewall treatments, so the size itself stays constant while the visual presentation can change.

That makes year-and-make fitment much simpler than on many postwar marques. If you have a 1948 AC Saloon, your next step is usually choosing the sidewall look that best matches your restoration style, period preference, or show goals rather than comparing multiple tire dimensions across the model line.

On a 1948 AC, 550-17 is a traditional numeric bias-ply tire size. The 5.50 portion refers to the tire's nominal section width, while the 17 identifies the wheel diameter in inches. Because it is a bias-ply format, the size code reflects period convention rather than the later metric style seen on modern radial tires.

Understanding that code helps keep the car visually and mechanically in the right era. If your goal is an authentic postwar appearance on a 1948 AC Saloon, 550-17 points you toward the proper 17-inch bias-ply family, after which the main decision becomes whether you want blackwall or one of the whitewall presentations.

Yes. The 1948 AC model covered here, the Saloon, uses 550-17 throughout the year and make range represented on this page. There is no split between multiple tire sizes or wheel diameters within this 1948 AC lineup, so the basic fitment question is unusually clear.

That consistency means identifying the year and model usually resolves the size question right away. What still deserves attention is the style choice, because a blackwall can give a more restrained touring look while a wide whitewall or double whitewall changes the car's visual character without changing the underlying 550-17 fitment.

1948 AC tires in 550-17 are available in Blackwall, Wide Whitewall, and Double-Whitewall form. All of them share the same BFGoodrich bias-ply construction and 17-inch fitment, so the difference is primarily visual rather than dimensional. That gives owners a choice between a more understated look and a more decorative postwar presentation.

For a conservative British saloon restoration, many owners lean toward a cleaner period appearance, while whitewall treatments can suit a particular show style or owner preference. If authenticity matters for judged events, match the sidewall look to the car's market, restoration theme, and club guidance rather than assuming every whitewall style is equally appropriate.

BFGoodrich is the brand available for 1948 AC vehicles in the 550-17 size. The available products all fall within the Silvertown Classic Bias Ply line and are offered with different sidewall appearances rather than different constructions or diameters. That keeps the brand choice simple while still allowing some flexibility in presentation.

For most 1948 AC owners, that means the real comparison is between cosmetic variations of the same period-style tire family. If you are trying to match a particular restoration vision, compare blackwall versus whitewall treatments first, then confirm that the overall look complements the car's coachwork, trim, and intended use.

The available 550-17 tires for a 1948 AC share the same basic construction and size: all are BFGoodrich bias-ply tires in the Silvertown Classic Bias Ply series, all fit 17-inch wheels, and all carry the same listed weight. The main difference is sidewall styling, with choices in Blackwall, Wide Whitewall, and Double-Whitewall form.

That means your selection comes down to appearance and restoration intent rather than a change in fitment category. Owners pursuing a restrained factory-era look often compare blackwall against whitewall aesthetics carefully, while those building a show-focused presentation may choose the sidewall that best matches the stance and visual language of the finished car.

The available 550-17 listings for 1948 AC do not carry a tube-type or tubeless marker in the size description, so the practical decision should be made by confirming the wheel design and the exact tire sidewall marking before installation. On postwar collector cars, tube use often depends as much on the wheel construction and condition as on the tire itself.

That is especially important on older 17-inch wheels that may have seen decades of service, repainting, or restoration work. Before fitting new tires to a 1948 AC Saloon, inspect the wheels carefully and confirm tube requirements with the specific tire and wheel combination you plan to use rather than assuming one answer applies in every case.

A 1948 AC Saloon using the original fitment family is designed around a 17-inch wheel, and the available 550-17 tires mount on that same rim diameter. That makes diameter compatibility straightforward for an original-style restoration. The key point is that 17-inch match, because a tire cannot be safely mounted to a different wheel diameter.

Original wheels should still be checked for condition before reuse on any collector car. Look for corrosion, out-of-round rims, damage around the bead area, and any previous repairs that could affect how the tire seats, especially on a car that may have spent long periods off the road between restoration stages.

A 1948 AC should be stored in a cool, dry space away from direct sunlight, electric motors, battery chargers, and other ozone-producing equipment that can accelerate sidewall aging. Bias-ply tires also tend to develop temporary flat-spotting more readily during long static periods, especially if the car sits without being moved or repositioned.

Keeping the tires properly inflated, rolling the car occasionally, or supporting the vehicle appropriately during long-term storage can help reduce stress on the casing. Clean floors, stable temperatures, and protection from moisture matter just as much, because collector cars often age their tires through environment and inactivity more than through mileage.

Tires on a 1948 AC usually age out before they wear out. On a collector car, a sensible rule is to evaluate tires closely once they reach about five to seven years of age and to give serious replacement consideration as they approach the ten-year mark, regardless of remaining tread. The DOT date code on the tire is the best starting point for establishing age.

That matters because a lightly driven postwar saloon may spend years looking fine while the rubber and internal structure slowly harden with time. If your 1948 AC still wears older tires, age should carry more weight than mileage when you decide whether the car is ready for regular road use or just short, careful local outings.

Tires on a 1948 AC should be inspected before every drive and more thoroughly before any extended outing. Check for sidewall cracking, cuts, bulges, irregular tread wear, and pressure loss, and do not overlook the valve stems and the spare. Older collector cars often reveal tire problems through age-related condition rather than heavy wear patterns.

A brief walk-around can prevent a minor issue from turning into a roadside problem. On a 1948 AC Saloon that may only be driven occasionally, inspection is especially important after the car has been sitting, because storage conditions, underinflation, and long periods without movement can change how the tire behaves once it is back on the road.

A 1948 AC Saloon would have been fitted in the bias-ply era, and the available replacement fitment for this model is 550-17 in bias-ply construction. That lines up with what buyers expect from a proper postwar British saloon presentation: a tall-profile tire on a 17-inch wheel, built in the construction style common to the period.

Original-equipment branding could vary by market and delivery history, so size, construction type, and sidewall appearance usually matter more than chasing a brand assumption. If you are restoring a 1948 AC for authenticity, use 550-17 bias-ply as your baseline and then confirm market-specific details with AC marque specialists or period factory literature.

Correct tire fitment matters a great deal when showing a 1948 AC, especially in preservation, concours, or marque-focused events. Judges and knowledgeable enthusiasts often notice whether the car wears the right size family, the proper period construction, and a sidewall style that suits the era. On a postwar AC, an obviously modern-looking substitute can distract from an otherwise accurate restoration.

For a 1948 AC Saloon, staying with 550-17 bias-ply fitment keeps the car in the right visual and historical lane. If you are preparing for judged events, use club standards and event rules to decide whether blackwall or one of the whitewall options is most appropriate, since authenticity expectations can differ by venue and restoration philosophy.

The most authentic tire look for a 1948 AC starts with the correct 550-17 bias-ply size and then narrows to sidewall presentation. Blackwall offers the most restrained appearance, while Wide Whitewall and Double-Whitewall create a more decorative period look. All three keep the car within the proper size and construction family, but they communicate different restoration choices visually.

A British saloon like the 1948 AC often rewards subtlety, so it is wise to compare the tire's sidewall style against the car's trim level, paint scheme, and intended show setting. When authenticity is the priority, period photos, marque clubs, and surviving reference cars are better guides than broad assumptions about what looked fashionable on other postwar vehicles.

Properly maintained 1948 AC tires in the correct 550-17 bias-ply size can be used for normal road driving, but their real-world behavior reflects period construction. Bias-ply tires generally track, steer, and respond differently than modern radials, so the driving experience remains more authentic to the era. Highway suitability depends not only on the tires but also on the car's brakes, steering, suspension, and overall mechanical condition.

That means the safest approach is to view tire condition as one part of the whole vehicle's readiness. A sound 1948 AC Saloon on fresh, correctly fitted tires can be enjoyable on public roads, but speeds and trip length should still be matched to the car's age, setup, and the confidence you have in its broader mechanical preparation.

Inflation pressure for 1948 AC tires should be set according to the vehicle manufacturer's recommendations for the car and the tire maker's guidance for the exact 550-17 product being used. Because pressure is tied to vehicle weight distribution, intended use, and tire design, it is important to use the specification that matches the actual tire and application rather than borrowing a number from a different classic car.

Start with the factory recommendation for the 1948 AC Saloon if you have access to original literature, then confirm that your chosen reproduction tire's operating limits align with that use. After inflation is set, monitor wear pattern and ride behavior over time, because collector cars often benefit from careful fine-tuning rather than a one-time pressure guess.

Before taking a 1948 AC on a longer drive, inspect all four tires and the spare for cracks, cuts, bulges, uneven wear, and proper inflation. Pay attention to valve stems and the condition of the wheel itself, and make sure the tire size remains the correct 550-17 fitment for the car. A quick visual check is not enough if the car has been sitting for a while.

Longer trips also call for a broader mechanical review, since tires are only one part of a safe outing in a postwar collector car. On a 1948 AC Saloon, it is wise to combine the tire inspection with checks of brakes, fluids, steering response, and basic roadside preparedness so the car is ready for distance as well as appearance.