1955 Simca Tire Fitment Guide

1955 Simca vehicles in this range use two tire sizes, and both apply to the 1955 Simca Aronde: 155R14 and 560-14. Both sizes mount on 14-inch rims, but they are not the same kind of tire. The 155R14 is a radial size, while the 560-14 is a bias-ply size. Where rim width is specified, the 155R14 products fit 4.00- to 5.50-inch rims, while the 560-14 products fit 3.50- to 4.00-inch rims.

That means a 1955 Simca owner should start by deciding whether the goal is an original-era bias-ply presentation or a radial construction alternative, then confirm the actual wheel width before ordering. Since there is only one model here, identifying the car is simple, but verifying the wheels on the car matters because the two sizes do not share the same listed rim-width range.

On a 1955 Simca, 560-14 is a numeric bias-ply size. The 560 designates the tire's nominal section width in the older numeric system, and the 14 indicates a 14-inch wheel diameter. That format belongs to the bias-ply era, so it reads very differently from a later metric radial size even though it fits the same wheel diameter.

A 1955 Simca owner looking at 560-14 should expect a traditional bias-ply tire selection rather than a modern metric radial. In practice, that makes 560-14 the natural choice for a restoration-minded Aronde owner who wants the car to look and feel closer to its mid-1950s character, especially when paired with the desired blackwall or whitewall appearance.

On a 1955 Simca, 155R14 is a Euro-metric radial size. The 155 is the nominal section width in millimeters, the R identifies radial construction, and the 14 is the wheel diameter in inches. When no aspect ratio is printed in this format, it follows the conventional early metric radial pattern commonly associated with an 80-series profile.

That makes 155R14 a very different type of tire from 560-14 even though both are built for 14-inch rims. A 1955 Simca owner considering 155R14 should think of it as a radial alternative that changes the construction and driving character more than the basic wheel diameter, then verify the exact product details because markings such as tubeless designation and speed rating are not identical across every offering.

For a 1955 Simca Aronde, the choice between 155R14 and 560-14 is mainly a choice between radial and bias-ply construction. The 155R14 options are radial tires in blackwall form, while the 560-14 options are bias-ply tires available in blackwall, narrow whitewall, and wide whitewall styles. Both fit 14-inch rims, but they represent different eras of tire design and different priorities for the finished car.

Owners restoring a 1955 Simca for a more original visual and driving presentation will usually gravitate toward the 560-14 bias-ply. Owners who plan to drive the car more regularly on modern roads may prefer the 155R14 radial path. Either way, confirm the wheel width on the car before making the final choice, because the listed rim-width ranges differ between the two sizes.

1955 Simca tires are available in more than one sidewall style, depending on size. The 155R14 radial offerings are blackwall only, while the 560-14 bias-ply is available as a blackwall, a narrow whitewall, or a wide whitewall. That gives Aronde owners a broader appearance range on the bias-ply side than on the radial side.

A blackwall generally keeps the look understated and especially appropriate for many European compact cars of the mid-1950s. Whitewall choices can shift the visual character toward a more accessorized period appearance, which may appeal to some restorations even on a smaller French car. The key is to match the sidewall style to the way you want your 1955 Simca to present, not just to the wheel diameter.

Three brands appear in the available 1955 Simca tire offerings. Michelin and Firestone both cover the 155R14 radial size, while BFGoodrich covers the 560-14 bias-ply size. That means brand choice depends partly on which construction and size path you want for the Aronde, not simply on the make of the car.

A 1955 Simca owner comparing brands should first narrow the decision to radial versus bias-ply, then compare the products within that size. Michelin has a long historical association with French motoring culture, while Firestone and BFGoodrich are well-known names in the collector-tire space. Brand heritage can matter to some buyers, but the bigger practical question is whether the size, sidewall style, and construction fit the intended use of the car.

For 1955 Simca fitments with listed rim-width guidance, the 155R14 radial products fit 4.00- to 5.50-inch rims, while the 560-14 bias-ply products fit 3.50- to 4.00-inch rims. Both sizes use a 14-inch rim diameter, but they do not share the same published width range. Rim width matters because it influences how the tire seats, carries its shape, and presents on the wheel.

A 1955 Simca owner should measure the actual wheel before choosing between the radial and bias-ply options. If the car still has its original-style narrow wheels, the 560-14 may align more naturally with that setup. If the wheel is wider within the listed radial range, the 155R14 becomes a more straightforward candidate. Checking wheel width first prevents choosing a size that is correct in diameter but mismatched in width.

Inner-tube requirements on 1955 Simca tires depend on the specific product. Within the 155R14 radial size, the Michelin X is marked TL, meaning tubeless, while the Firestone 155R14 is listed without a tube marking. The 560-14 bias-ply products are also listed without tube markings in the size line. Because the markings are not uniform across every listing, tube status should be confirmed on the exact tire you intend to use.

A 1955 Simca owner should also consider the wheel itself, because some older wheels may still lead an owner or restorer to run tubes even when a tire is offered in tubeless form. The safest approach is to verify the tire's sidewall designation and inspect the wheel condition and design before installation, especially on a mid-1950s collector car that may have seen wheel changes over its lifetime.

A 1955 Simca Aronde uses two sizes that both fit a 14-inch wheel diameter, so the basic diameter compatibility is there for both 155R14 and 560-14. The larger question is wheel width. The published width range for 155R14 is 4.00 to 5.50 inches, while the listed width range for 560-14 is 3.50 to 4.00 inches.

That means some original 1955 Simca wheels may suit the bias-ply size better than the radial, depending on their actual measured width. Owners should not assume that because both sizes are 14-inch they are equally appropriate for every wheel. Measure the rim, inspect its condition, and match it to the selected tire's width requirement before deciding to keep the existing wheels in service.

A 1955 Simca should be stored in a cool, dry, dark environment away from direct sunlight, electric motors, battery chargers, furnaces, and other ozone-producing sources that age rubber. Keep the tires properly inflated during storage, and move the car periodically if possible. Since 1955 Simca fitments can be either bias-ply or radial, remember that bias-ply tires are generally more prone to temporary flat-spotting during long static periods.

If the car will sit for an extended season, many collectors either roll it occasionally or support it in a way that reduces prolonged loading on one contact patch. Clean, dry floors are preferable to damp ground, and a breathable cover is better than trapping moisture around the car. Good storage habits protect both the tires and the overall drivability of a lightly used collector Simca.

On a 1955 Simca, tire life is usually judged more by age than by mileage because collector cars often see limited use. A sensible rule is to begin evaluating tires closely once they reach about five to seven years of age and to treat around ten years as a point for serious replacement consideration, even if tread remains. The DOT date code on the tire is the starting point for determining age.

That matters because a lightly driven 1955 Simca can still be riding on aged rubber that looks acceptable at first glance. Sidewall cracking, hardening, vibration, and loss of confidence at road speed often relate to age rather than wear depth. If the tires have an older date code, plan your inspection and replacement schedule around age first and mileage second.

Tires on a 1955 Simca should be inspected before every drive and again before any extended outing. Look for sidewall cracking, uneven wear, cuts, bulges, punctures, and any change in how well the tires hold air. Pressure checks are important even on a car that is only driven occasionally, because collector vehicles can lose pressure gradually while parked.

A longer trip deserves an extra look at the spare as well, along with the valve stems and the overall condition of the wheel assemblies. If your chosen 1955 Simca setup uses tube-type construction or tubes within the assembly, valve-stem condition becomes especially important. Frequent inspection is inexpensive insurance on an older car where tire age, storage habits, and infrequent use all influence reliability.

A 1955 Simca Aronde would have been associated with bias-ply construction in its original era, which makes the 560-14 bias-ply size the most natural historical reference point among the available choices. The 155R14 options represent a radial format that suits later driving preferences rather than the default construction expected on many mid-1950s small cars. Original-market details could still vary by market, equipment level, and later owner changes over time.

For a restoration aiming at authenticity, start with the bias-ply route and then narrow the visual choice to blackwall or the whitewall style that best matches your car's presentation. If the car is being judged, event standards matter as much as general period practice. Marque clubs and Simca specialists are the right places to confirm market-specific expectations beyond the broad construction type.

Correct tire fitment absolutely matters when showing a 1955 Simca, especially in restoration classes where judges pay attention to size, construction type, and sidewall appearance. A radial tire on a car presented as factory-authentic can stand out immediately, and an aggressive or visually incorrect sidewall treatment can do the same. Even when the wheel diameter is correct, construction and appearance still influence how authentic the car looks.

That does not mean every shown 1955 Simca must wear the same tire, but it does mean the choice should match the standard you are building toward. A touring-oriented car may accept compromises that a concours entry would not. Before finalizing the tire choice, compare your target event's judging priorities with the exact size and sidewall style you plan to run.

For the 1955 Simca in 155R14, the Michelin X and Firestone F560 Radial Tire share the same radial size and blackwall appearance, but they differ in listed details. The Michelin X is marked 155R14 80T TL and weighs 20 pounds, while the Firestone F560 weighs 14.6 pounds and carries a published fit range of 4.00- to 5.50-inch rims along with a maximum load of 990 pounds at 44 psi. Those are meaningful specification differences within the same nominal size.

A buyer comparing the two for a 1955 Simca should treat them as two interpretations of the same radial fitment rather than interchangeable in every detail. Sidewall markings, published load information, and wheel-width compatibility all influence which tire makes the most sense for the car. Matching the product to the actual wheel and to the intended use of the Aronde is more important than choosing by size code alone.

1955 Simca tires can be suitable for highway driving when the correct size is chosen, the tires are in sound condition, and the vehicle is mechanically sorted. Among the listed products, the Michelin X in 155R14 carries a T speed rating, which corresponds to 118 mph. The other products do not all show speed ratings in the same way, so each tire's sidewall marking should be checked individually rather than assumed from the size alone.

On a mid-1950s Simca, the practical road limit is often shaped as much by the car's brakes, suspension, steering feel, and overall condition as by the tire itself. Highway use is less about chasing top speed than about having fresh, properly inflated tires that suit the car's intended use. Before regular road driving, match the tire choice to the car's setup and confirm the exact speed marking on the selected product.

Inflation pressure for a 1955 Simca should not be guessed from appearance alone or transferred from one size to another. The listed 560-14 bias-ply products carry a published maximum load of 906 pounds at 30 psi, while the Firestone 155R14 radial lists a maximum load of 990 pounds at 44 psi. Those figures are tire ratings, not universal operating instructions for every 1955 Simca tire.

The best approach is to start with the factory guidance for the car, then compare that with the selected tire manufacturer's specifications for the exact product. A bias-ply 560-14 and a radial 155R14 should not automatically be inflated the same way just because they fit the same 14-inch wheel diameter. Correct pressure is part of proper ride quality, wear, and road behavior on an older Simca.

Before a longer drive in a 1955 Simca, inspect each tire for cracks, cuts, bulges, punctures, uneven wear, and proper air pressure. Look closely at valve stems, and check the spare as carefully as the four road tires. If the car is using an older-style or tube-involved setup, the valve area and any signs of slow leakage deserve extra attention.

A tire check should be part of a wider pre-drive routine on a 1955 Simca that also includes brakes, wheel fasteners, steering response, and fluid levels. Collector cars often fail from small age-related issues rather than dramatic mechanical events. Taking a few extra minutes before departure helps ensure the tires are ready for sustained speed, heat, and distance rather than just a short local run.