1958 Oldsmobile 88 Series, Super 88 & 98 Tires

The 1958 Oldsmobile 88 Series, Super 88 & 98 uses two primary tire sizes: 850-14 and 900-14. Both are bias-ply sizes designed for 14-inch wheels, so the correct choice is not simply a matter of year and make, but also of the wheel-and-tire setup on the specific car.

A car that now wears one of these sizes may have retained its long-standing wheel setup, or it may have been changed at some point during restoration or regular service. Checking the size already installed, along with wheel width and available clearance, is the best way to decide which of the two primary sizes belongs on your Oldsmobile before moving on to sidewall style or radial-equivalent questions.

Both primary tire sizes for the 1958 Oldsmobile 88 Series, Super 88 & 98 use a 14-inch rim diameter. That remains true whether the car is fitted with 850-14 or 900-14, so the wheel diameter does not change between the two listed primary tire sizes.

Wheel diameter is only part of the fitment picture, though, because the two sizes do not share the same wheel-width range. An 850-14 product on this page is matched to a narrower wheel range than a 900-14 product, so measuring the actual wheel before replacement helps prevent choosing a tire that is correct in diameter but mismatched to the rim.

This Oldsmobile fitment includes both 850-14 and 900-14, which means more than one primary size appears within the covered vehicle grouping. Both are 14-inch bias-ply tires, but they represent different nominal widths and correspond to different wheel-width requirements.

That matters because a wider bias-ply tire should not be chosen simply for appearance without confirming the wheel can support it. On a car from this era, replacement decisions are often influenced by restoration history, existing wheels, and the stance the owner wants to maintain, so the practical first step is verifying what is already on the car rather than assuming one size applies to every example.

For this 1958 Oldsmobile fitment, 850-14 is a primary bias-ply tire size. The available products in that size on this page are BFGoodrich Silvertown Classic Bias Ply tires, so the original fitment path represented here stays within traditional bias-ply construction.

That distinction matters because a buyer may see radial equivalents for 850-14 and assume the primary size itself is radial, which it is not. Keeping the car on an 850-14 bias-ply tire supports a more traditional presentation, while switching to a radial alternative calls for extra attention to wheel width, tire dimensions, and overall clearance rather than a simple size-for-size assumption.

Radial equivalents for 850-14 include 215R14 as an 80-series metric radial, P225/75R14 as a 75-series P-metric radial, and P235/70R14 as a 70-series P-metric radial. A recommended rim-width range of 5-7 inches is tied to these equivalents, which helps frame the wheel side of the conversion decision.

Each of those sizes offers a different sizing convention and profile family, so the choice is not only about matching the original code as closely as possible. Comparing wheel width, overall tire dimensions, and clearance at the fenders and steering points is the sensible next step, especially on a large late-1950s car that may have seen suspension or wheel changes over time.

Start by confirming which primary size the car uses, since radial equivalents are shown for 850-14 rather than for both primary sizes on this page. From there, compare the actual wheel width to the radial’s recommended range, then review overall dimensions and clearance around the fenders, steering components, and suspension.

A careful conversion also means looking at the full condition of the car’s chassis and wheels rather than treating the tire alone as the change point. Older collector cars can carry replacement wheels, altered ride height, or worn front-end parts, and each of those factors can affect how a radial alternative behaves and whether it has adequate space once mounted and inflated.

Choosing an 850-14 tire starts with deciding whether you want to stay with a traditional bias-ply construction or explore one of the radial-equivalent sizes associated with that fitment. Within the bias-ply choices shown here, the major visible difference is sidewall treatment, with both wide whitewall and narrow whitewall options available in BFGoodrich’s Silvertown Classic Bias Ply series.

The next layer is making sure the tire suits the wheel already on the car and the way the Oldsmobile will be used. A restoration-oriented car may prioritize traditional appearance, while a road-driven car may lead you to compare equivalent radial sizing more closely. In either case, confirm wheel width, keep an eye on clearance, and avoid choosing by sidewall appearance alone.

The available sidewall styles for this fitment are wide whitewall and narrow whitewall. In both 850-14 and 900-14, the BFGoodrich Silvertown Classic Bias Ply line includes a 2.25-inch whitewall option and a 1.00-inch whitewall option, giving the car two distinct visual directions within the same general tire family.

That choice affects the finished look of the car far more than many owners expect, especially on a full-size 1958 Oldsmobile with substantial chrome and body side detail. A wider whitewall generally creates a more formal period-style presentation, while a narrower whitewall can look cleaner and slightly less dressy. The best choice depends on the car’s current styling theme and restoration intent.

Rim width matters because the two primary sizes on this page do not share the same wheel-width range. The 850-14 products are matched to 5.50-6.00 inch rims, while the 900-14 products are matched to 6.00-7.00 inch rims, even though both sizes use a 14-inch wheel diameter.

That means a tire can be correct in diameter and still be a poor match for the wheel if width is overlooked. Measuring the wheel on the car is especially worthwhile when the vehicle has changed hands, been restored long ago, or may no longer wear its earlier wheel setup. Wheel width should be confirmed before choosing between the narrower and wider primary tire sizes.

For a period-style presentation, the starting point is one of the two primary bias-ply sizes used on this Oldsmobile: 850-14 or 900-14, depending on the wheel-and-tire setup already on the car. Both sizes are available in BFGoodrich’s Silvertown Classic Bias Ply series, which keeps the vehicle in a traditional construction and visual format.

From there, the decision usually comes down to confirming the proper size and selecting the whitewall look that best suits the car’s restoration direction. Owners pursuing strict historical accuracy should compare their car against marque-specific references and restoration documentation, since period-style replacement and exact original delivery appearance are not always the same thing.

Tire construction affects both stance and visual character on a 1958 Oldsmobile, especially because this is a large late-1950s car where sidewall treatment and tire proportions are easy to notice. A bias-ply tire preserves the traditional construction used in the primary fitments shown here, which often aligns well with restoration-oriented goals.

A radial alternative can still be a sensible option for some owners, but it changes the decision from straightforward replacement to comparison of overall proportions, wheel compatibility, and intended use. For a car built in an era when tire appearance played such a strong styling role, construction choice is part of the restoration conversation, not just a mechanical specification.

Yes, modifications can affect tire fitment on a 1958 Oldsmobile 88 Series, Super 88 & 98 even when the tire size itself is correct on paper. Changes to wheel width, wheel offset, ride height, springs, suspension parts, or body clearance can all influence how an 850-14, 900-14, or radial equivalent sits and moves on the car.

That is why a collector vehicle should be checked as it exists today, not only as it may have left the factory decades ago. A car with aftermarket wheels or a lowered stance may need extra attention at the front wheel openings and during steering travel, while a stock-height car still benefits from a quick clearance check before committing to replacement tires.

Before road use, inspect the wheels for correct diameter and width, make sure the tires are inflated properly, and verify that each tire clears the body, suspension, and steering components through the full range of motion. It is also wise to look over the valve stems, wheel condition, and overall mounting quality before putting miles on the car.

A newly installed tire cannot compensate for loose steering parts, worn suspension components, or long-neglected brake work on a full-size 1958 Oldsmobile. A short local test drive followed by a second inspection often reveals rubbing, settling, or pressure loss early, which is especially useful on collector cars that may spend long periods parked between outings.

Collector-car tires should be maintained with regular pressure checks, routine visual inspection, and attention to age-related deterioration as much as tread wear. On 850-14 or 900-14 tires, look closely for sidewall cracking, bulges, cuts, uneven wear, and any sign of slow air loss, since an older hobby car may cover limited miles but still age in place.

Storage conditions matter almost as much as miles driven, so keeping the Oldsmobile away from prolonged sunlight, excess heat, moisture, and ozone sources helps preserve the tires between drives. Moving the car occasionally, keeping the chassis in sound condition, and reinspecting the tires before each season or longer outing are sensible habits for a large collector-era car.