1958 Cadillac 62 Series Tires

The 1958 Cadillac 62 Series uses two primary tire sizes: 800-15 and 820-15. Both are bias-ply sizes for 15-inch wheels, and the covered 8-cylinder sub-model is associated with both sizes rather than a single universal fitment.

That means the first step is confirming which size is actually on the car or which wheel setup the Cadillac is using now. Once the size is verified, the choice becomes more about sidewall style, brand, and tire series, or whether a radial equivalent is being considered while keeping the correct 15-inch wheel diameter in mind.

The primary tire sizes for a 1958 Cadillac 62 Series use a 15-inch rim diameter. Both 800-15 and 820-15 are built around that same 15-inch wheel size, so the diameter itself stays consistent even though the tire sizes differ.

Rim diameter is only part of the fitment picture on a car like this. Wheel width should also be checked, especially if the Cadillac has replacement steel wheels, aftermarket wheels, or a long-ago tire conversion. Staying with the correct 15-inch diameter helps narrow the search, but the exact tire choice still depends on confirming the actual wheel and tire setup.

Both 800-15 and 820-15 are vintage numeric bias-ply tire sizes. The first number is the nominal section width in inches with the decimal omitted, so 800 means about 8.00 inches and 820 means about 8.20 inches, while the 15 identifies the wheel diameter.

Modern buyers often recognize metric radial sizes more easily, so these older numeric designations can seem unfamiliar at first. On a 1958 Cadillac 62 Series, understanding the code helps separate the original-style bias-ply fitment from later radial-equivalent choices. It also makes it easier to compare whitewall options and product series without confusing an equivalent radial size with the primary fitment.

For the 1958 Cadillac 62 Series, 800-15 is a primary bias-ply tire size. It is part of the original-style fitment family for this car and uses a 15-inch rim, which keeps it in the traditional sizing and construction format expected for many late-1950s American luxury cars.

That matters because a bias-ply tire and a radial equivalent are not the same thing, even when they are meant to serve a similar size role. Owners who want a more traditional look and period driving feel often stay with 800-15 bias-ply construction, while owners considering a radial should compare wheel width, overall size, and clearance before making the change.

For 800-15, radial equivalents include 225R15, P235/75R15, P235/70R15, and the bias-look radial 800R15. For 820-15, the equivalent radial choices are 235R15, P235/75R15, P255/70R15, and the bias-look radial 820R15.

Those options cover several sizing approaches, from Euro-metric radial formats to P-metric alternatives and bias-look radials that retain a more traditional visual impression. A recommended rim-width range of 6-8 inches applies to these equivalent choices, but size equivalence does not remove the need to confirm wheel compatibility, section clearance, and the overall setup on the Cadillac before switching constructions.

Start by confirming the Cadillac’s current primary size, wheel diameter, and wheel width, then compare the chosen radial equivalent against that setup. For this car, the relevant radial alternatives are tied to the original 800-15 and 820-15 fitments, and the equivalent range is associated with 15-inch wheels and a 6-8 inch rim width.

The practical checks are overall dimensions, steering clearance, fender clearance, and any changes made to the suspension or wheels over the years. A collector car may also have replacement rims that differ from stock appearance but still affect fitment. Converting construction is often more straightforward when the whole wheel-and-tire package is verified before mounting anything.

The biggest consideration is confirming whether the car should be on 800-15 or 820-15, since both sizes are associated with the 1958 Cadillac 62 Series. After size, the next major choice is whether the goal is a traditional bias-ply presentation or a radial-equivalent approach that still works with a 15-inch wheel.

Once those decisions are settled, compare sidewall style, brand, tire series, and wheel-width compatibility. A whitewall Cadillac often depends heavily on visual proportion, so sidewall treatment can matter almost as much as the tire size itself. Cars that have been modified, re-wheeled, or stored for long periods deserve an extra fitment check before any final selection.

Available sidewall styles for the 1958 Cadillac 62 Series include blackwall, narrow whitewall, and wide whitewall depending on the tire size and product selected. The 800-15 offerings center on wide whitewall designs, while 820-15 opens up a broader mix that includes blackwall and narrow whitewall choices as well.

That variety matters because sidewall treatment changes the car’s entire visual character, especially on a large 1950s Cadillac with prominent wheel openings and trim. Buyers focused on a restoration-oriented appearance usually compare whitewall width carefully, while buyers building a more understated look may prefer blackwall. The right choice starts with the correct tire size and then narrows by appearance.

Tires for the 1958 Cadillac 62 Series are available from Coker Classic, BFGoodrich, Firestone, US Royal, Universal Vintage Tire, and Avon across the covered sizes. Those brands appear in bias-ply offerings tied to 800-15 and 820-15, with the widest variety showing up in 820-15.

Brand choice is usually less about declaring a single winner and more about matching the tire’s look and series to the car’s goals. Some owners focus on a specific sidewall style, some want a certain period-brand presentation, and others are comparing specialty bias-ply series. After confirming size, compare the details that affect the Cadillac’s appearance and wheel compatibility.

A period-style 1958 Cadillac 62 Series usually starts with one of its primary bias-ply sizes, 800-15 or 820-15, rather than jumping straight to a modern radial format. From there, the most meaningful appearance decision often becomes the sidewall treatment, since this Cadillac’s visual character is strongly influenced by whitewall proportion.

That does not mean one brand or one whitewall width is automatically right for every restoration. Buyers seeking strict originality should compare the car against authoritative references such as marque-club guidance, period photography, or vehicle-specific historical records. For many owners, the best approach is choosing the correct size first, then selecting a bias-ply style that suits the restoration’s intended presentation.

Tire construction affects both stance and visual character on a restored 1958 Cadillac 62 Series. A bias-ply tire maintains the traditional sizing language and period-style presentation associated with the car, while a radial equivalent can change the look even when it remains within the same 15-inch wheel family.

That difference is why many restoration-minded owners begin with the original-style 800-15 or 820-15 bias-ply fitment and then decide whether appearance or road-use preference carries more weight. A bias-look radial can sometimes bridge those priorities, but it should still be treated as an alternative format that needs the same careful wheel and clearance verification as any other conversion.

Yes, modifications can affect tire fitment on a 1958 Cadillac 62 Series even when the car still uses 15-inch wheels. Changes such as aftermarket wheels, altered wheel width, suspension lowering, spring changes, or body and brake modifications can all influence how an 800-15 or 820-15 tire sits and clears.

A classic Cadillac may also have accumulated changes over decades that are not obvious at first glance. Measuring the actual wheel diameter and width, then checking steering and fender clearance, is the safest way to avoid choosing a tire on size designation alone. That extra step becomes even more important when considering radial equivalents instead of the original-style bias-ply construction.

Before driving a 1958 Cadillac 62 Series on new tires, inspect the wheels for correct diameter and condition, confirm the tires are seated properly, and set inflation to the tire maker’s specification for the tire being used. It also helps to check valve stems, lug hardware, and visible clearance at the fenders and steering components.

A short, careful test drive should follow the initial installation so any rubbing, pull, vibration, or air loss can be caught early. Collector cars often sit for long stretches, so it is smart to inspect suspension wear, steering play, and brake condition at the same time. A fresh set of tires performs best when the rest of the running gear is ready for road use too.

Maintain 800-15 or 820-15 tires on a collector 1958 Cadillac 62 Series with regular pressure checks, visual inspections, and careful storage habits. Look for sidewall cracking, cuts, bulges, uneven wear, and slow air loss, especially on a car that is driven infrequently and may spend long periods parked indoors.

Good storage matters just as much as mileage on a collector car tire. Keeping the Cadillac away from prolonged sunlight, excess heat, moisture, and ozone sources helps preserve both the casing and sidewall appearance. Periodic inspections are still necessary even when tread looks fresh, because age and storage conditions can affect a tire long before it appears worn out.