1959 Borgward Tire Fitment Guide

1959 Borgward vehicles in this range use four tire sizes, all for the Isabella: 165R13, 590-13, 175R13, and 640-13. Every one of those sizes mounts on a 13-inch rim. Where rim-width guidance is available, 165R13 fits 4.50- to 6.00-inch rims, 590-13 fits 3.50- to 4.00-inch rims, and 640-13 fits 4.00- to 4.50-inch rims.

That means the first question is not wheel diameter, but which size and construction best match your car’s current wheels and intended presentation. A 1959 Borgward Isabella set up for period authenticity often points buyers toward one of the bias-ply sizes, while a road-driven Isabella may lead them toward one of the radial options. Checking the wheel width before ordering is especially important because the approved rim ranges are not the same across the group.

On a 1959 Borgward, 590-13 is a traditional numeric bias-ply size. The 590 portion is the older nominal section-width designation, and the 13 indicates the wheel diameter in inches. In the available product range, this size appears as a bias-ply tire with a wide whitewall sidewall and a listed fit range of 3.50 to 4.00 inches in rim width.

That older sizing system matters because it reflects the period when the Isabella was built, and it gives the car a distinctly vintage look and feel. If your Borgward is being restored with strong attention to era-correct appearance, 590-13 is the kind of size code you would expect to see in that conversation. Before choosing it, make sure the wheel itself falls within the approved width range for the specific tire.

On a 1959 Borgward, 165R13 is a euro-metric radial size. The 165 refers to the nominal section width in millimeters, the R indicates radial construction, and the 13 is the wheel diameter in inches. When no aspect ratio is printed in this older format, it is conventionally treated as an 80-series radial, and the available products fit 4.50- to 6.00-inch rims.

That makes 165R13 easy to recognize as the more modern style of sizing among the Isabella options. It also explains why the tire behaves differently from a numeric bias-ply alternative even though the rim diameter remains the same. If your Borgward is driven regularly and already has a wheel width that suits this range, 165R13 is often the logical starting point to compare against the wider 175R13 radial.

The main difference between 590-13 and 165R13 on a 1959 Borgward is construction type and the overall character that comes with it. The 590-13 is a bias-ply size offered as a wide whitewall, while 165R13 is a radial offered in blackwall form. Both fit 13-inch wheels, but they are intended for different wheel-width ranges and create a different period impression on the car.

A Borgward Isabella restored with authenticity in mind will often lean toward the bias-ply choice because it preserves the vintage look and construction style associated with the era. An Isabella driven more often on modern roads may point you toward the radial because of its later-style construction and available H speed rating. The right decision comes from balancing appearance, wheel width, and how you actually use the car rather than treating the two sizes as interchangeable.

1959 Borgward tires are available in two very different sidewall presentations. The radial 165R13 products are offered as blackwalls, while the bias-ply 590-13 and 640-13 products are offered as wide whitewalls. That creates a clear visual split between a more understated late-period radial look and a stronger period-styled bias-ply presentation.

Sidewall style matters as much as construction on a collector car because it changes the whole stance and personality of a 1959 Borgward Isabella. A whitewall bias-ply setup suits a restoration-focused look and aligns naturally with mid-century styling expectations, while a blackwall radial keeps the appearance simpler and more restrained. If the car will be judged or shown, confirm what is considered correct for your market and presentation standard before settling on a sidewall style.

Three brands appear in the available 1959 Borgward range: Michelin, Dunlop, and BFGoodrich. Michelin and Dunlop cover the 165R13 radial size, while BFGoodrich covers the 590-13 and 640-13 bias-ply sizes. That means brand choice is tied closely to size and construction rather than being evenly spread across every Borgward fitment option.

For an Isabella owner, that brand split helps narrow the search quickly. If you are focused on a radial in 165R13, you will be comparing Michelin and Dunlop offerings in blackwall form. If the car calls for a vintage whitewall bias-ply appearance, BFGoodrich is the brand represented in the available sizes. It is usually smarter to choose the correct size and construction first, then compare the brand options that exist within that lane.

Rim-width guidance for 1959 Borgward tires varies by size. The 165R13 radial fits 4.50- to 6.00-inch rims, the 590-13 bias-ply fits 3.50- to 4.00-inch rims, and the 640-13 bias-ply fits 4.00- to 4.50-inch rims. Those ranges show that even though all three mount on 13-inch wheels, they are not aimed at the same wheel widths.

That difference is one of the most important setup checks on a Borgward Isabella. A tire can share the right rim diameter and still be a poor choice if the wheel is too narrow or too wide for the approved range. Measure the wheel you actually have on the car before choosing among the available sizes, especially if the car has been restored, modified, or fitted with replacement wheels at some point in its life.

Tube status on 1959 Borgward tires depends on the specific product and size. The two Michelin 165R13 radial products are marked TL, meaning tubeless, while the Dunlop 165R13 listing does not show a tube-type or tubeless marker. The 590-13 and 640-13 bias-ply products also do not carry a TT or TL marker in the size listing, so tube use should be confirmed against the tire’s sidewall marking and the wheel design itself.

That matters because tube decisions are not made by size code alone on a collector car. An original-style wheel, a replacement wheel, and a modern reproduction tire can each influence whether a tube is appropriate. On a 1959 Borgward Isabella, the safest approach is to verify the exact tire marking and inspect the wheel condition before installation rather than assuming every radial is tubeless or every bias-ply automatically requires a tube.

All listed 1959 Borgward tire sizes use a 13-inch rim diameter, so they are compatible at the wheel-diameter level. That does not automatically mean every original wheel is suitable for every size, because the approved rim-width ranges differ across the sizes. A 590-13 bias-ply, a 640-13 bias-ply, and a 165R13 radial each ask different things of the wheel.

For an Isabella owner, that means the original wheel can often remain part of the equation, but the exact width must be checked before moving from one size family to another. A car that once wore a narrow bias-ply wheel may not be the right foundation for a wider radial. Confirm the actual wheel width first, then choose from the sizes that fit that wheel rather than working in the reverse direction.

A stored 1959 Borgward should be kept away from direct sunlight, electric motors, welders, heaters, and other ozone-producing equipment that can age sidewalls. Clean, dry floors and stable temperatures help, and the car should either be moved periodically or supported in a way that reduces long-term static loading. Bias-ply tires tend to flat-spot more readily during storage than radials, so that difference matters if your Isabella sits for extended periods.

Good storage habits protect both the tire structure and the way the car feels when it returns to the road. A 1959 Borgward Isabella on bias-ply tires may need a few miles to settle out after sitting, while a radial setup generally recovers more quickly. Even on a low-mile collector car, proper storage is one of the easiest ways to preserve ride quality, sidewall appearance, and overall tire life.

On a 1959 Borgward, tire age usually matters more than tread wear because collector cars often see limited mileage. A sensible rule is to begin evaluating tires closely once they reach about five to seven years of age and to treat the ten-year mark as a serious replacement consideration, regardless of tread depth. The DOT date code on the tire sidewall is the key reference point for that age check.

That approach is especially important on a Borgward Isabella because an older tire can still look presentable and yet be well past its safest service window. Sidewall condition, storage history, and how well the tire holds pressure all matter alongside the date code. If the car is used for occasional tours or longer club drives, age-based replacement is far more trustworthy than assuming low miles automatically mean plenty of life remains.

Tires on a 1959 Borgward should be checked before every drive and again before any longer outing. Look for cracking, cuts, bulges, irregular wear, and signs that the tire has lost pressure since the last use. On sizes where tube use may apply, the condition of the valve stem and the tire’s ability to hold air steadily deserve extra attention.

Frequent inspection makes a real difference on a low-use collector car because problems often develop while the car is parked rather than while it is being driven. A Borgward Isabella that only comes out on weekends or for events can still suffer from age, storage stress, and pressure loss. Catching those issues early helps prevent roadside trouble and gives you time to correct a tire or wheel problem before it affects the car’s handling.

A 1959 Borgward Isabella belongs to an era when bias-ply construction was still the standard original-equipment type for most passenger cars, even as radial technology was gaining traction in Europe. Within the available size range, the numeric bias-ply sizes 590-13 and 640-13 are the closest match to that period construction style. Original-equipment brand and exact market-specific fitment can vary, so the key point is usually construction type, size family, and sidewall presentation rather than a single universal brand answer.

That gives restorers a practical path: start with the correct period-style bias-ply size family, then confirm market and body-specific details through Borgward marque resources and period literature. A radial may still be appropriate for a road-driven Isabella, but it represents a later-style tire choice rather than the most era-faithful presentation. For a judged restoration, owners should verify the expected size and sidewall treatment for their particular car before finalizing the setup.

Correct tire fitment matters on a shown 1959 Borgward because judges and knowledgeable enthusiasts often notice size family, construction type, and sidewall style immediately. A radial blackwall and a bias-ply wide whitewall can give the same Isabella very different visual character, even though both fit 13-inch wheels. On an originality-focused car, a modern-style radial can stand out just as much as an obviously incorrect sidewall treatment.

For that reason, the best show choice depends on the standard you are trying to meet. A local enthusiast event may be more relaxed, while concours-style judging can place more emphasis on period-correct construction and appearance. If your 1959 Borgward is being prepared for serious judging, treat tire selection as part of the restoration plan and confirm the accepted standard with the event organizers or a Borgward club before the car goes on the field.

Choosing between radial and bias-ply tires for a 1959 Borgward restoration comes down to the goal of the project. Bias-ply sizes such as 590-13 and 640-13 align most closely with the period construction associated with the Isabella’s era, while radial sizes such as 165R13 and 175R13 reflect a later driving-oriented approach. The sidewall appearance also changes with that decision, since the available radial products are blackwalls and the listed bias-ply products are wide whitewalls.

A restoration aimed at historical accuracy will usually favor the bias-ply path because it preserves both the look and the construction character expected of the period. A restoration intended for regular road use may still choose a radial, but that is a conscious trade toward a different driving experience rather than a factory-authentic presentation. Making that decision early helps keep the wheel, stance, and visual finish of the 1959 Borgward consistent from start to finish.

1959 Borgward tires can be suitable for highway use when they are the correct size, in sound condition, and used within their construction and speed limits. The available 165R13 radial products include H-rated examples, which carry a 130 mph ceiling. The bias-ply sizes do not show a broader range of speed-rating detail here, so their use should be approached with the normal expectations of a vintage-construction tire on a collector car.

In real-world terms, the tire is only one part of the highway question on a Borgward Isabella. Brake condition, steering wear, suspension health, alignment, and the overall mechanical state of a mid-century car usually matter just as much as the tire’s rating. If the car is being prepared for regular higher-speed road use, a fresh radial setup may fit that mission better, while a bias-ply setup should be driven with period-appropriate expectations.

Inflation pressure on 1959 Borgward tires should follow the factory recommendation for the car and the operating limits of the specific tire you choose. Within the listed products, the 590-13 bias-ply carries a maximum load of 970 pounds at 32 psi, and the 640-13 bias-ply carries 1045 pounds at 32 psi. Those figures are load-and-pressure ratings for the tire itself, not a universal instruction to inflate every Borgward size to the same pressure.

That distinction matters because pressure should not be transferred casually from one size or construction type to another. A radial and a bias-ply of the same rim diameter can want different service pressures in actual use. The best approach is to start with the vehicle’s original guidance where available, then confirm that your chosen tire’s pressure range and load capability are being respected for the way your 1959 Borgward Isabella is used.

Before a longer drive in a 1959 Borgward, inspect every tire for visible cracking, cuts, bulges, abnormal wear, and proper cold inflation. Check that each tire is holding pressure consistently, and examine valve stems closely, especially if your setup uses or may use tubes. The spare should also be aired up and inspected, because a spare that has aged in the trunk can be just as compromised as the tires on the car.

That tire check should be part of a broader pre-trip routine on a vintage Borgward Isabella. Wheel fasteners, steering feel, brake operation, fluid levels, and charging-system health all deserve attention before the car is asked to cover more distance than usual. A well-prepared collector car is far more enjoyable to drive, and the few extra minutes spent inspecting the tires can prevent the most common age-related problems from turning into trip-ending ones.