1958 Oldsmobile Tire Fitment Guide

1958 Oldsmobile vehicles use two tire sizes: 900-14 and 850-14. The 900-14 size fits the 88 Series, the 88 Series, Super 88 & 98 grouping, the 98 Convertible, and Wagons. The 850-14 size fits the 88 Series, Super 88 & 98 grouping and Wagons. Both sizes mount on 14-inch wheels, but they do not use the same approved rim-width range. The 900-14 products fit 6.00 to 7.00 inch rims, while the 850-14 products fit 5.50 to 6.00 inch rims.

That means a 1958 Oldsmobile owner should confirm the exact model first and then verify the wheel before choosing a tire. Shared 14-inch diameter does not automatically make the two sizes interchangeable in every situation, because section width and approved rim width differ. If your car has had wheels changed during restoration, measure the wheel and compare it to the intended tire's recommended range before moving forward.

On a 1958 Oldsmobile tire, 900-14 is a numeric bias-ply size. The 9.00 figure refers to the nominal section width in inches, and the 14 refers to the wheel diameter in inches. Because there is no letter prefix or radial construction marker, this is a traditional bias-ply sizing convention common on American full-size cars of the late 1950s.

For a 1958 Oldsmobile owner, that code tells you you are looking at a period-style tire for a 14-inch wheel rather than a later metric radial format. It is the broader of the two sizes used across the line and appears on more model groupings. If your goal is to keep the car visually and historically aligned with its era, understanding that old numeric code is the first step toward selecting the right reproduction tire.

No, not all 1958 Oldsmobile models use the same tire size. The 900-14 size appears across the widest range of applications, including the 88 Series, the mixed 88 Series, Super 88 & 98 grouping, the 98 Convertible, and Wagons. The 850-14 size is more limited and appears only on the 88 Series, Super 88 & 98 grouping and Wagons. Both are 14-inch bias-ply sizes, but they serve different fitment needs within the model lineup.

That matters because year and make alone are not enough to choose a tire for every 1958 Oldsmobile. A buyer comparing a 98 Convertible with a wagon or a higher-series sedan may find overlapping fitment, but not universal fitment. The safest approach is to identify the exact model, check the wheel width actually on the car, and then select the size that matches both the application and the restoration direction.

1958 Oldsmobile tires are available in both Wide Whitewall and Narrow Whitewall versions in each of the two sizes, 900-14 and 850-14. All current options in these sizes are BFGoodrich bias-ply tires from the same Silvertown Classic Bias Ply family, so the sidewall choice is primarily about appearance rather than switching to a different construction type.

That gives a 1958 Oldsmobile owner a straightforward styling decision. A wide whitewall typically looks most at home on a late-1950s American full-size car, especially one restored to a factory-style presentation, while a narrower whitewall creates a slightly cleaner and more understated profile. If the car is being judged, compare the sidewall width to period photos, factory literature, and marque-club guidance for the exact model.

BFGoodrich is the available brand for 1958 Oldsmobile tires in both 900-14 and 850-14. In each size, the choices are bias-ply tires offered with either a Wide Whitewall or Narrow Whitewall sidewall treatment. The product family is consistent across the two sizes, so the main differences are size, rim-width range, load rating, and sidewall appearance rather than brand-to-brand construction changes.

For a 1958 Oldsmobile buyer, that means the brand decision is already narrowed and the real comparison happens within the BFGoodrich lineup. Instead of sorting through multiple manufacturers, you can focus on confirming the correct numeric size for your model and deciding which whitewall width best suits the car's presentation. That tends to simplify restoration planning, especially on a full-size Oldsmobile where visual proportion matters.

On 1958 Oldsmobile tires, the Wide Whitewall and Narrow Whitewall options share the same basic size, construction, load rating, and wheel fitment within each size. In 900-14, both versions carry a maximum load of 1860 pounds at 32 psi and fit 6.00 to 7.00 inch rims. In 850-14, both versions carry a maximum load of 1740 pounds at 32 psi and fit 5.50 to 6.00 inch rims. The practical difference is the width of the white sidewall band.

That makes the choice largely visual for a 1958 Oldsmobile owner. A wide whitewall emphasizes the dramatic late-1950s look and tends to suit more formal or highly restored presentations, while a narrow whitewall gives the car a subtler profile without changing the tire's basic specification. If the car is intended for judged display, choose the whitewall width that best matches period-correct appearance for the exact model and trim.

1958 Oldsmobile tire rim-width requirements depend on the size. The 900-14 tires fit rims from 6.00 to 7.00 inches wide, while the 850-14 tires fit rims from 5.50 to 6.00 inches wide. Both sizes use a 14-inch rim diameter, but the acceptable wheel width is not the same between them.

That distinction is important any time a 1958 Oldsmobile has had wheels swapped, restored, or replaced over the years. A tire can match the wheel diameter and still be wrong for the wheel width. Before fitting either size, measure the wheel or confirm its specification so the tire sits correctly on the rim and maintains the intended profile, load support, and appearance.

The available 1958 Oldsmobile tire products are listed as bias-ply sizes without tube-type or tubeless markings in the size designation. Since the products themselves do not separate into clearly marked TT and TL versions, tube use should be confirmed against the specific wheel design and the exact tire sidewall marking before installation, especially on original late-1950s wheels.

For a 1958 Oldsmobile owner, the practical point is that wheel condition matters just as much as the tire. Original steel wheels, restored wheels, and later replacement wheels can differ in how they are intended to seal. Before mounting tires, inspect the wheels carefully and confirm with the installer whether tubes, valve stems, or additional prep are appropriate for the wheel-and-tire combination you plan to run.

Original 1958 Oldsmobile wheels can potentially accept both listed tire sizes only when the wheel diameter and wheel width match the requirements of the intended tire. Both 850-14 and 900-14 fit 14-inch rims, but 850-14 calls for a 5.50 to 6.00 inch rim and 900-14 calls for a 6.00 to 7.00 inch rim. Diameter alone is not enough to settle the question.

That means some 1958 Oldsmobile wheels may overlap at 6.00 inches, while others may clearly suit one size better than the other. If the car still has its factory wheels, verify their actual width before assuming either size is appropriate. If the wheels came from another GM full-size car or from a later restoration, a quick measurement is the cleanest way to avoid a costly mismatch.

A stored 1958 Oldsmobile should be kept in a cool, dry, dark garage away from direct sunlight, electric motors, welders, furnaces, and other ozone sources that age rubber. Bias-ply tires are more prone than radials to developing temporary flat spots when they sit in one position for long periods, so storage conditions and periodic movement matter. Clean, dry floors and stable inflation pressures also help protect the tire casing and sidewalls.

If a 1958 Oldsmobile will sit for months, roll it slightly from time to time or place it on stands according to safe shop practice to reduce static loading. Avoid parking on damp soil or surfaces that hold moisture, and keep petroleum products away from the rubber. A collector car that is stored carefully will usually drive smoother on its next outing and show less sidewall aging over time.

On a 1958 Oldsmobile, tire age usually matters more than mileage because many collector cars are driven infrequently. A sensible rule is to begin evaluating tires closely once they are about five to seven years old and to treat ten years from the date code as a point where replacement deserves serious consideration, even if tread depth still looks acceptable. Rubber hardens and structural materials age whether the car is used often or not.

That is especially relevant for a 1958 Oldsmobile that spends much of its life in storage or appears mostly at shows. Check the DOT date code if present on the tire and keep records of installation dates. If ride quality changes, sidewalls begin to craze, or the car develops vibration after long storage, age may be a more likely cause than tread wear.

Tires on a 1958 Oldsmobile should be inspected before every drive and again before any longer outing or tour. Look for sidewall cracking, cuts, bulges, uneven tread wear, low inflation, and any sign that the tire has shifted or been damaged while the car was parked. On a collector car, long idle periods can hide problems that would be obvious on a daily driver because the tires are not being observed as often.

A quick inspection is one of the simplest ways to prevent trouble on the road. Include the spare in the routine, since an aged or neglected spare is common on older cars and may be unusable when needed most. If your wheel-and-tire setup uses tubes, have valve stems and sealing components checked as part of the same inspection cycle rather than treating them as separate items.

A 1958 Oldsmobile 88 Series would originally have been a bias-ply application, which aligns with the available 900-14 reproduction offerings for that model. Bias-ply construction was standard practice on American full-size cars in this period, and the late-1950s look was closely tied to numeric sizing and whitewall presentation rather than later radial conventions. No specific original-equipment brand should be assumed unless you are working from factory literature or verified survivor evidence.

For restoration work, the important point is to match the car's original style of tire before worrying about brand mythology. Start with the correct size for the exact model, then choose the whitewall width that best reflects the presentation you want. If the car is being restored for marque judging, check period brochures, dealer photography, and Oldsmobile club references for market- and trim-specific guidance.

Correct tire fitment matters on a 1958 Oldsmobile because judges and knowledgeable enthusiasts notice size, construction type, and sidewall appearance immediately. A full-size late-1950s Oldsmobile has a strong visual relationship between wheel opening, tire section width, and whitewall treatment, so an incorrect size or an out-of-era sidewall can change the car's stance and overall impression even when the rest of the restoration is well executed.

For most show purposes, the safest route is to stay with the proper bias-ply size for your specific model and choose a whitewall width that matches period presentation. Event standards can differ, so a local cruise night may be far more relaxed than marque concours judging. If points matter, consult Oldsmobile club resources and the rulebook for the event rather than assuming any whitewall tire from the period will be treated the same.

For a 1958 Oldsmobile, the difference between 850-14 and 900-14 is not construction type, since both are bias-ply 14-inch sizes, but application, width, and wheel fitment. The 850-14 products fit 5.50 to 6.00 inch rims and carry a maximum load of 1740 pounds at 32 psi. The 900-14 products fit 6.00 to 7.00 inch rims and carry a maximum load of 1860 pounds at 32 psi. They are not simply cosmetic alternatives.

That makes size selection an authenticity issue as well as a fitment issue on a 1958 Oldsmobile. A car restored with the wrong numeric size can look subtly off even if the tire still fits the wheel diameter. If you are trying to preserve factory character, treat the model application first, then the whitewall choice second. That sequence keeps the car closer to the way a properly sorted late-1950s Oldsmobile should sit.

1958 Oldsmobile tires can be suitable for highway driving when they are in good condition, correctly fitted, properly inflated, and used within the limits of their design. The available tires here are bias-ply products, which have a different feel from modern radials and typically follow road grooves more, react differently in crosswinds, and flat-spot more readily after sitting. On a late-1950s full-size car, overall mechanical condition often matters just as much as the tire itself at normal highway speeds.

A 1958 Oldsmobile owner should think of the tires as one part of a complete roadworthiness check rather than the only deciding factor. Sound steering components, aligned suspension, fresh brakes, and proper wheel condition all influence how secure the car feels on the highway. If your Oldsmobile is newly restored or has not been driven much, start with shorter trips first and let the chassis prove itself before planning sustained higher-speed travel.

The available 1958 Oldsmobile tire products list their maximum load at 32 psi: 1860 pounds at 32 psi for 900-14 and 1740 pounds at 32 psi for 850-14. Those figures identify the tire's rated maximum load-and-pressure pairing, not automatically the pressure every car should be run at in normal service. Factory vehicle pressure recommendations should come from the owner's literature or trusted marque references for the exact model and intended use.

A practical approach is to treat the tire sidewall rating and the vehicle recommendation as related but not interchangeable numbers. Do not transfer the 900-14 pressure assumption to an 850-14 tire or vice versa, and do not assume a show car, a lightly loaded cruiser, and a loaded wagon should all be set the same way. Matching the pressure to the exact size and application will help ride quality, tread wear, and stability.

Before taking a 1958 Oldsmobile on a longer drive, inspect each tire for cracks, cuts, bulges, embedded debris, irregular wear, and proper inflation. Check that the whitewall surfaces are clean enough to reveal any developing damage, and make sure the spare is usable and aired correctly. Because this is a collector-era car, the tires should be considered alongside a broader mechanical review that includes brakes, steering play, wheel bearings, fluid levels, belts, hoses, and lights.

That pre-drive routine is especially important on a 1958 Oldsmobile that sees occasional use rather than weekly mileage. Long storage can hide issues until the car is back at speed, and bias-ply tires may need a few miles to smooth out after sitting. If the car has original-style wheels or a recently completed restoration, have the wheel hardware, valve stems, and overall tire installation checked before committing to a long-distance outing.