1959 Renault Fregate Tires

The 1959 Renault Fregate uses two primary tire sizes: 185R15 in radial construction and 640-15 in bias-ply construction. Both sizes are built for 15-inch rims, so the fitment question is less about diameter and more about which construction and size format matches the car’s current wheel and tire setup.

A Fregate that has long been maintained with bias-ply tires may still be set up around 640-15, while another car may already be using 185R15 radials. Checking the existing tires, wheel width, and the car’s intended appearance helps narrow the choice before comparing brands, sidewall styles, and series.

The 1959 Renault Fregate uses a 15-inch rim diameter with both of its primary tire sizes. That applies whether the car is fitted with the 185R15 radial size or the 640-15 bias-ply size, so rim diameter stays consistent even though tire construction and section format change.

Rim diameter alone does not settle the full fitment question. Wheel width still matters, especially when comparing radial and bias-ply products, so it is worth measuring the actual wheels on the car before selecting a tire. That becomes even more important if the car has replacement wheels from an earlier restoration or prior owner.

The 1959 Renault Fregate Base shares the same fitment pattern as the model core, with both 185R15 radial and 640-15 bias-ply sizes applicable on 15-inch rims. There is no separate Base-only tire size that changes the basic decision between these two primary fitment paths.

That makes selection more about the car’s current configuration than the sub-model badge. A Base fitted for a traditional restoration may lean toward the numeric bias-ply size, while a car intended for more regular road use may be evaluated around the radial option. Existing wheel width and tire clearance are still worth confirming first.

640-15 is the bias-ply tire size used on the 1959 Renault Fregate. It is a vintage numeric bias-ply format, and the available products in this size follow that traditional construction with blackwall, narrow whitewall, and wide whitewall choices depending on the series and brand selected.

That matters because a bias-ply setup influences both appearance and wheel compatibility. A buyer considering 640-15 should compare the tire against the wheel width actually on the car and decide whether the goal is a more traditional late-1950s look or a shift toward radial construction through one of the established equivalent sizes.

Radial equivalents for 640-15 include 175R15 as the 80-series metric radial option, P175/75R15 as the P-metric 75-series radial option, and P185/70R15 as the P-metric 70-series radial option. These are alternative radial size formats for comparison with the original bias-ply size, not identical copies of the same tire.

The useful next step is checking the wheel width and overall package on the car before making the switch. A recommended rim-width range of 5 to 6 inches applies to these equivalents, and clearance around the fenders and steering should also be reviewed, especially on a collector car that may not be on its original wheels.

Start by confirming which bias-ply size the car currently uses and then compare that setup with the intended radial size. On a 1959 Renault Fregate moving away from 640-15, the recognized radial equivalents are 175R15, P175/75R15, and P185/70R15, all built for the same 15-inch rim diameter family.

Wheel width should be checked first, since the recommended rim-width range for those equivalents is 5 to 6 inches. It is also smart to inspect steering clearance, fender clearance, suspension condition, and the age of any existing wheels. On an older car, previous repairs or wheel changes can matter just as much as the nominal tire size.

The first consideration is whether the car should stay with the 640-15 bias-ply fitment or use the 185R15 radial fitment. Both are 15-inch sizes, but they differ in construction, size format, wheel-width expectations, and the kind of appearance they give the car once mounted.

After construction is settled, compare the available brands, tire series, and sidewall styles within the correct size. A period-style restoration may point toward a whitewall bias-ply choice, while a more road-driven Fregate may be evaluated around radial options in blackwall, narrow whitewall, or redline form. The actual wheel dimensions on the car remain important.

1959 Renault Fregate tires are available in several sidewall styles depending on size and product series, including blackwall, narrow whitewall, wide whitewall, and redline. The 185R15 radial size includes blackwall, narrow whitewall, and redline options, while 640-15 bias-ply products add wide whitewall choices as well.

That sidewall choice has a strong effect on how the car presents visually. A wide whitewall supports a distinctly late-1950s appearance, while blackwall can feel more understated and redline offers a sportier period-inspired look. Once the style is narrowed down, keep the search within the correct primary size and construction for the car’s current setup.

Several brands offer applicable tires for the 1959 Renault Fregate. In 185R15 radial form, choices include Coker Classic, Michelin, Avon, and Universal Vintage Tire, while 640-15 bias-ply options include BFGoodrich, Firestone, Avon, and Excelsior across multiple series and sidewall treatments.

Brand comparison should be tied to the correct size and construction first, then narrowed by sidewall style, series character, and wheel compatibility. A buyer choosing between radial and bias-ply may end up comparing entirely different brand groups, so it helps to settle the fitment path early rather than treating every available product as interchangeable.

For a period-style 1959 Renault Fregate, the 640-15 bias-ply size is the natural place to start because it reflects the traditional numeric bias-ply fitment used on the car. Available products in that size include blackwall, narrow whitewall, and wide whitewall presentations, which lets the tire support the car’s overall restoration direction.

The right choice depends on how formal or understated the finished car should look. Buyers pursuing exact originality should compare the planned tire against period photos, marque references, or restoration records before settling on a sidewall treatment. For many owners, the best result is simply staying true to the era without overstating authenticity.

Tire construction changes the visual character of a restored 1959 Renault Fregate even when the rim diameter stays at 15 inches. A 640-15 bias-ply gives the car a more traditional late-1950s presentation, while a 185R15 radial introduces a more modern tire format that can subtly alter the stance and sidewall impression.

Sidewall treatment then shapes that appearance further. Wide whitewalls create a distinctly dressy period feel, while blackwall keeps the car cleaner and less ornamental, and redline adds a different visual emphasis. Matching construction and sidewall style to the restoration goal usually produces a more convincing result than choosing by size alone.

Yes, modifications can affect tire fitment on a 1959 Renault Fregate even when the nominal tire size seems correct. Replacement wheels, altered wheel width, suspension work, ride-height changes, or body repairs can all change how a 185R15 radial or 640-15 bias-ply sits in the wheel opening and clears surrounding components.

A car that has been restored over many decades may not still have its original wheel setup, so measuring the actual wheels is worthwhile before ordering tires. Steering clearance, fender clearance, and the relationship between the tire and suspension parts should all be checked, especially when moving from one construction type to another.

Before driving a 1959 Renault Fregate on new tires, inspect the wheels for damage or excessive rust, confirm that the tire beads seat properly, and make sure inflation is correct for the tire being used. It is also sensible to look over suspension and steering components so the new tires are not being asked to compensate for worn hardware.

A short initial road test can reveal rubbing, pull, vibration, or unusual clearance issues that were not obvious on the lift. After that first drive, recheck pressure and visually inspect the tire sidewalls and tread area. Collector cars often sit for long periods, so an extra once-over helps catch small setup problems early.

1959 Renault Fregate tires should be maintained with regular pressure checks, routine visual inspections, and attention to age as well as tread. Whether the car uses 185R15 radials or 640-15 bias-ply tires, sidewall cracking, cuts, bulges, and slow air loss deserve prompt attention, particularly on a low-mileage collector vehicle.

Storage conditions matter more than many owners expect. Keeping the car away from prolonged sunlight, heat, moisture, and ozone sources can help preserve tires that spend long stretches parked. It also helps to inspect the tires before any longer drive rather than assuming a seldom-used set is still road-ready just because the tread looks good.