1958 NSU Prinz Tires

The 1958 NSU Prinz is associated with two tire sizes: 440-12 in bias-ply construction and 125R12 in radial construction. Both sizes use a 12-inch rim, so the main fitment distinction is construction type and sizing format rather than wheel diameter.

Choosing between them starts with the car's current wheel setup and the kind of driving or restoration result you want. A Prinz kept in a more traditional presentation may stay with 440-12, while a car using the radial format may use 125R12. Clearance, wheel width, and overall condition should still be checked before mounting either style.

The tire fitments associated with the 1958 NSU Prinz both use a 12-inch rim diameter. That applies to the 440-12 bias-ply size and the 125R12 radial size, so wheel diameter remains consistent even though the tire construction and sizing systems differ.

Rim diameter is only one part of the fitment picture on a small vintage car like the Prinz. It is also worth checking actual wheel width, especially when considering the radial option, and making sure the car has not been altered with replacement wheels over the years. A visual confirmation of the wheel and tire already on the car helps prevent ordering the right diameter in the wrong overall setup.

The covered 1958 NSU Prinz I, II & III sub-model range shares the same two tire-size paths: 440-12 as a bias-ply fitment and 125R12 as a radial fitment. In practical terms, the sub-model name does not introduce a separate wheel diameter or an exclusive third size.

That makes the decision easier, because the next question is how the individual car is equipped today. A Prinz wearing traditional bias-ply tires may be best evaluated around 440-12, while a car already using radial-format tires may point toward 125R12. The owner should still inspect wheels, suspension condition, and clearance rather than assuming every surviving car remains exactly as delivered.

440-12 is the bias-ply tire size associated with the 1958 NSU Prinz. It uses the older numeric sizing format, with the leading number representing a nominal section-width class and the final number indicating a 12-inch rim diameter.

That matters because a 440-12 bias-ply tire gives the car a distinctly vintage look and construction character. Owners considering a change to radial construction should not treat the two formats as automatically interchangeable just because they share the same rim diameter. Wheel width, overall tire dimensions, and body or steering clearance should be reviewed before moving away from the bias-ply setup.

125R12 is the radial tire size associated with the 1958 NSU Prinz. In that size designation, 125 is the nominal section width in millimeters, R marks radial construction, and 12 is the rim diameter in inches.

Using a radial size on a Prinz changes the tire-selection conversation from traditional numeric bias-ply fitment to compact Euro-metric sizing. That can be appealing for owners who want a later-style road tire while staying on a 12-inch wheel. It is still smart to confirm wheel width and inspect for clearance around suspension and fenders, especially on a car that may have seen wheel or chassis changes over time.

The 1958 NSU Prinz can be approached in either direction because 440-12 bias-ply and 125R12 radial fitments are both associated with the car. Bias-ply generally aligns with a more traditional period-style presentation, while the radial option suits owners who want the Prinz in a later-style tire format.

The best choice depends on the car's purpose and current setup rather than a one-size-fits-all rule. A restoration-oriented Prinz may stay with 440-12 for visual character, while a regularly driven car may be evaluated around 125R12. Either way, the wheel dimensions, clearance, and overall condition of the suspension and steering should be checked before settling on a construction type.

Start by deciding whether the car should remain on 440-12 bias-ply tires or use the 125R12 radial format. Both fitments use a 12-inch rim, but they represent different construction styles, different sizing systems, and a different overall look on the car.

After construction and size are settled, compare sidewall treatment, brand, and the way the tire supports the car's intended use. A narrow whitewall changes the Prinz's presentation noticeably, while a blackwall gives a plainer look. It also helps to verify wheel width, inspect the current tires for clues about prior fitment, and choose a tire that matches the car's restoration goals or driving plans.

The 1958 NSU Prinz has tire options in both blackwall and narrow whitewall styles. That applies across the available 125R12 radial and 440-12 bias-ply choices, giving owners a visible appearance decision even when the wheel diameter remains the same.

Sidewall style can influence the car's personality almost as much as the construction choice. A blackwall usually keeps the look simple and understated, while a narrow whitewall adds more visual accent and a stronger period flavor. Since both presentations are available, the better choice depends on how the Prinz is being finished and whether the owner wants a restrained road-car look or a more restoration-oriented appearance.

Michelin and BFGoodrich both offer tires for the 1958 NSU Prinz. Michelin appears in the 125R12 radial fitment through the Michelin X Radial line, while BFGoodrich covers the 440-12 bias-ply fitment in the Silvertown Classic Bias Ply series.

That brand split reflects the broader decision between radial and bias-ply construction rather than two brands competing in the exact same size and format. A buyer choosing Michelin is also choosing the 125R12 radial path, while BFGoodrich corresponds to the 440-12 bias-ply path. Looking at sidewall style, wheel compatibility, and the intended finish of the car will usually narrow the choice more effectively than brand name alone.

For a period-style 1958 NSU Prinz, the 440-12 bias-ply size is the strongest starting point because it keeps the car in a traditional numeric bias-ply format. That approach generally suits an owner who wants the tire itself to reflect the small-car character of the late 1950s.

Appearance goals still matter within that size, since blackwall and narrow whitewall versions create different visual results. A more exact originality-focused restoration should also be checked against marque-specific references, surviving photos, or other authoritative vehicle history sources before settling on a sidewall treatment. The right restoration tire is not only about size, but also about how the whole car is being finished.

Tire construction changes the visual character of a restored 1958 NSU Prinz in a noticeable way. A 440-12 bias-ply tire presents the car in a more traditional vintage format, while a 125R12 radial introduces a later-style Euro-metric look even though both use the same 12-inch rim diameter.

That difference becomes important on a compact car, where the tire takes up a large share of the car's side profile. Owners trying to preserve a distinctly late-1950s feel often look first at the bias-ply option, then decide between blackwall and narrow whitewall styling. A driver-oriented restoration may still favor the radial format, but it will change the visual impression along with the construction type.

Yes, modifications can affect tire fitment on a 1958 NSU Prinz even when the tire size itself is associated with the car. Replacement wheels, changes in wheel width, suspension alterations, lowered ride height, or body repairs can all influence how a 12-inch tire sits and clears.

That is especially important when moving between 440-12 bias-ply and 125R12 radial construction, because the change is not only about wheel diameter. A Prinz with aftermarket wheels or non-stock suspension should be measured carefully before new tires are chosen. Turning clearance, fender clearance, and the condition of steering components are worth checking at the same time so the tire decision matches the car as it exists today.

Before driving a 1958 NSU Prinz on new tires, inspect the wheels for damage or corrosion, confirm the bead seats are clean, and make sure the tire size and construction match the intended setup. It is also wise to check valve stems, look over the suspension and steering for looseness, and confirm that each tire has proper clearance once mounted.

A short, careful test drive helps reveal rubbing, pull, vibration, or air-loss issues before the car is used more seriously. Since collector cars often sit for long periods, it also makes sense to verify brake operation and alignment condition rather than focusing on the tires alone. A fresh set of tires performs best when the rest of the running gear is ready for the road as well.

Tires on a collector 1958 NSU Prinz should be maintained with regular pressure checks, periodic visual inspection, and careful storage habits. Even low-mileage tires can age, so sidewall cracking, tread separation, bulges, cuts, and unexplained air loss deserve attention whether the car uses 440-12 bias-ply tires or 125R12 radials.

Storage conditions matter almost as much as mileage on a lightly used vintage car. Keeping the Prinz away from prolonged sunlight, excess heat, moisture, and ozone sources can help preserve the tires between drives. It also helps to move the car occasionally or avoid leaving it parked on underinflated tires for long periods, since flat spotting and stress from inactivity can shorten useful service life.