1962 NSU Tire Fitment Guide

1962 NSU fitment centers on the Prinz, which uses three tire sizes: 125R12, 440-12, and 4.80-12. All three mount on 12-inch wheels. Rim width guidance appears on the radial 125R12 at 3.0 to 4.0 inches, while the other two sizes remain 12-inch fitments that should still be checked against the actual wheel before final selection.

The practical takeaway is that year and make alone are not the only part of the decision, even with a single model in the range. You still need to confirm which of the three sizes your Prinz is set up to use and whether you want radial or bias-ply construction. If the car is already wearing older tires, compare the sidewall markings and verify the wheel dimensions before moving to a replacement.

On a 1962 NSU, 125R12 is a euro-metric radial size. The 125 indicates a nominal section width of 125 millimeters, the R identifies radial construction, and the 12 is the rim diameter in inches. When a metric radial size appears in this older form without a stated aspect ratio, it is conventionally understood as an 80-series tire.

That matters because 125R12 represents a different design philosophy than the bias-ply alternatives used on the same car. A radial typically gives a more familiar modern driving feel, while still preserving the narrow proportions expected on a small early-1960s European car. If your Prinz is driven regularly on paved roads, this size is often the one buyers compare first against the more traditional bias-ply options.

On a 1962 NSU, 440-12 is a numeric bias-ply size. In this older sizing convention, the first number represents the tire's nominal section width and the last number gives the rim diameter, which here is 12 inches. Unlike a metric radial code, it does not include an R because the construction is bias-ply.

That distinction is useful when you are comparing a Prinz set up for authenticity against one aimed more at regular road use. Numeric bias-ply sizes like 440-12 look and behave more like original-era tires, including the way they sit on the wheel and respond on the road. If originality is a major goal, this code is one of the key markings to recognize before replacing an older tire.

For a 1962 NSU Prinz, the choice between 125R12 and 440-12 is mainly a choice between radial and bias-ply construction. The 125R12 is a radial 12-inch fitment available from Michelin, while the 440-12 is a bias-ply 12-inch fitment available from BFGoodrich. Both belong to the same model family, but they support different ownership priorities.

A buyer chasing period presentation will often lean toward the bias-ply option, especially on a restoration where the look and driving character should stay close to the early-1960s experience. A buyer planning more regular road use may prefer the radial. The right answer starts with how the car will be used, then moves to confirming the exact size already called for by the wheels and the car's setup.

1962 NSU tires are available in more than one sidewall style. The 125R12 radial comes in Blackwall and Narrow Whitewall versions, and the 440-12 bias-ply also comes in Blackwall and Narrow Whitewall form. That gives Prinz owners a choice between a more understated factory-style appearance and a whitewall presentation that can shift the car's visual character.

On a compact German economy car of this period, blackwall is often the safer direction for a restrained, market-correct look, while narrow whitewall can suit a personalized restoration or a car restored to a particular regional taste. Sidewall style should be chosen after the size and construction are settled, not before. That keeps appearance decisions from steering you into the wrong fitment.

Michelin and BFGoodrich both cover 1962 NSU fitments, but they do so in different sizes and constructions. Michelin covers the 125R12 radial, while BFGoodrich covers the 440-12 bias-ply. That means brand choice and size choice are linked on this application rather than being completely interchangeable across the whole range.

For the buyer, that narrows the decision quickly. If you know you want the radial 125R12, you are looking at Michelin offerings in blackwall or narrow whitewall. If you know you want the 440-12 bias-ply, BFGoodrich is the path. Start with the size and construction that match your Prinz and your goals, then choose the sidewall style that fits the finished look of the car.

For 1962 NSU fitment, the clearest rim width guidance appears with the 125R12 radial, which fits a 3.0- to 4.0-inch rim width range on a 12-inch wheel. The 440-12 and 4.80-12 are also 12-inch sizes, but the safest approach is to compare them against the actual wheel on the car rather than assume every 12-inch wheel is automatically suitable in width.

That is especially important on a small car like the Prinz, where tire proportions and wheel dimensions are both narrow by modern standards. If the car has original wheels, measure the wheel and compare the sidewall marking on the existing tire before replacing anything. If the wheels have been changed at some point in the car's life, checking width first can prevent an expensive mismatch.

Tube requirements on 1962 NSU tires depend on the size and the specific tire construction. The 125R12 Michelin radial carries a TL marking, which means tubeless. The bias-ply 440-12 does not carry a TL or TT marker in the available product markings, so tube fitment should be confirmed against the tire itself and the wheel type before installation rather than assumed one way or the other.

That distinction matters because a tire's tube status is only part of the equation on a vintage car. Wheel condition, bead-seat design, and whether the rim was originally intended for tubeless service all affect the final setup. If your Prinz still uses older wheels, inspect the rims carefully and confirm the tire's sidewall markings during the fitting process so the assembly matches the wheel's actual design.

All three 1962 NSU Prinz tire sizes use a 12-inch rim diameter, so they share the same basic wheel diameter requirement. That means the original Prinz wheels may be compatible at the diameter level with 125R12, 440-12, and 4.80-12. Diameter compatibility alone does not settle the whole question, though, because wheel width and condition still matter.

The smartest approach is to treat 12-inch diameter as the first checkpoint, not the final answer. If the car still has its original wheels, confirm their width and inspect them for damage, corrosion, or distortion before fitting new tires. If the wheels are aftermarket or from another small European car, verify both dimensions and fitment details carefully rather than assuming every 12-inch wheel is interchangeable.

A 1962 NSU should be stored away from direct sunlight, standing moisture, and ozone-producing equipment such as electric motors, welders, and some battery chargers. Keep the tires clean, properly inflated, and parked on a dry surface. Bias-ply tires tend to flat-spot more readily during long static storage, while any vintage tire can suffer sidewall aging if it sits near heat or ozone sources.

If the car will sit for an extended period, move it occasionally or place it on stands in a way that protects the suspension and avoids prolonged loading on one contact patch. That is especially useful on a light rear-engined compact like the Prinz, where preserving ride quality and avoiding storage-related deformation can make the first drive back on the road much smoother.

On a 1962 NSU, tire age usually matters more than mileage because cars like the Prinz are often driven seasonally or only on special occasions. A good working rule is to begin evaluating tires closely once they reach five to seven years of age and to treat around ten years as a serious replacement point regardless of remaining tread depth. The DOT date code, if present, is the key age marker.

That guideline helps prevent a common collector-car mistake: keeping a tire because it still looks nearly new at a glance. Rubber hardens and loses flexibility over time even when tread wear is minimal. If your Prinz has older reproduction tires, check both the date code and the condition of the sidewalls before another driving season rather than waiting for visible failure.

Tires on a 1962 NSU should be inspected before every drive and again before any longer outing. Look for sidewall cracking, tread separation, embedded debris, uneven wear, and pressure loss. If your car uses a tube-type setup, include the valve stems and any signs of slow leakage in the inspection routine rather than focusing only on tread depth.

Frequent inspection makes extra sense on a compact vintage car because small tires can react noticeably to pressure changes and aging. A Prinz that has been parked for weeks may look fine at a glance yet still have a low tire, a cracked sidewall, or a weak valve stem. Building a quick pre-drive tire check into your routine is one of the easiest ways to avoid roadside trouble.

For a 1962 NSU Prinz, bias-ply construction is the most historically typical starting point because small European cars of the early 1960s were built during the transition from traditional bias-ply practice toward wider radial adoption. The Prinz is covered by both bias-ply sizes, 440-12 and 4.80-12, as well as the radial 125R12. Original-market specifics can vary by destination, trim, and period replacement history.

For an authenticity-minded restoration, begin by checking surviving factory literature, old photographs, and marque-club references for your exact car. Size, construction, and sidewall treatment all matter when trying to recreate the right look. If your goal is judged originality, use those sources to confirm whether your particular Prinz should wear a bias-ply setup or an early radial fitment rather than relying on a one-size-fits-all answer.

Correct tire fitment absolutely matters when showing a 1962 NSU, especially on a car where the wheels and tires are visually prominent because of the compact body and small proportions. Judges and knowledgeable enthusiasts often notice whether the size, construction, and sidewall style match the period character of the car. A modern-looking replacement can change the stance and overall impression more than many owners expect.

For a show-oriented Prinz, the tire decision should be made as part of the restoration plan rather than as a final convenience purchase. Bias-ply construction and restrained sidewall styling often support a more period-faithful presentation, while a radial may be perfectly reasonable for touring but less convincing in originality-focused judging. Marque clubs and event rule books are the right places to confirm what your target show will consider acceptable.

For the 1962 NSU in 125R12, both Michelin options share the same basic size, radial construction, 12-inch rim diameter, 62S rating, and TL tubeless marking. The main difference is sidewall presentation: one is a Blackwall Michelin X and the other is a Narrow Whitewall Michelin X Radial. The narrow-whitewall version also carries a 3.0- to 4.0-inch rim width range and is slightly lighter in weight.

That makes this a choice driven mostly by appearance rather than by a major change in fitment intent. If the car is being restored with a cleaner European economy-car look, the blackwall tire is often the more natural visual match. If you want a bit more visual contrast without leaving the 125R12 radial format, the narrow whitewall offers that option while staying within the same overall size family.

1962 NSU tires can be suitable for highway use when they are the correct size, in sound condition, and matched to the way the car is actually driven. The 125R12 Michelin radial carries an S speed rating, which corresponds to a 112 mph ceiling. That is well beyond normal U.S. highway speeds, but tire condition, inflation, and the mechanical state of an early-1960s NSU matter just as much as the speed symbol.

On a vintage Prinz, the car's own braking, suspension, steering, and overall roadworthiness usually become the real limit before the radial tire's speed rating does. Bias-ply options should also be treated with the respect appropriate to their design and the age of the vehicle. Before sustained highway driving, make sure the tires are age-appropriate, properly inflated, and free of cracking or separation.

Inflation pressure for a 1962 NSU should be set by the vehicle's factory recommendations for the exact model and by the individual tire manufacturer's guidance for the tire you are using. The 125R12 radial products include a 62S service description, but a service description is not the same thing as a blanket pressure recommendation. Pressure should never be copied from one size to another simply because both fit a 12-inch wheel.

The safest method is to start with the owner's manual or period factory literature for the Prinz, then compare that against the tire's own sidewall information and manufacturer guidance. Small vintage cars are sensitive to pressure changes, and overinflation can alter ride and contact patch just as easily as underinflation can hurt stability. Set pressures cold and recheck them regularly, especially if the car is not driven often.

Before a longer drive in a 1962 NSU, inspect every tire for cracking, cuts, bulges, uneven wear, and proper cold inflation pressure. Check valve stems, confirm that the spare is usable, and make sure any older tire on the car is still within a reasonable age window for service. If the car uses a tube-type setup, pay extra attention to leakage and stem condition.

Tires are only one part of the pre-drive routine on a vintage NSU, but they are one of the easiest issues to catch before a trip. Once the tires are checked, move on to the broader basics that matter on an older car: brakes, steering feel, wheel fasteners, fluid levels, and lights. A compact car like the Prinz can be enjoyable on longer drives when those fundamentals are covered in advance.