1968 Cadillac Eldorado Tires

The 1968 Cadillac Eldorado uses a 900-15 tire size. That is a numeric bias-ply size mounted on a 15-inch rim, and it is the primary fitment for the covered Eldorado FWD application.

Once the size is confirmed, the next step is choosing the right type of 900-15 tire for the way the car will be used. Some owners want a traditional whitewall presentation for a restoration-oriented look, while others may compare radial-equivalent sizes before changing construction. The wheel diameter, wheel width, and overall vehicle setup should be checked before moving away from the stock-style fitment.

The primary tire fitment for the 1968 Cadillac Eldorado uses a 15-inch rim. That rim diameter matches the 900-15 tire size, where the final number in the size identifies the wheel diameter the tire is built around.

Rim diameter should be confirmed on the actual car before ordering tires, especially if the Eldorado has had wheel changes over the years. Diameter is only part of the picture, since wheel width also affects compatibility. A tire that matches the rim diameter still needs to suit the wheel’s width and the car’s available clearance to avoid fitment problems.

Yes. The covered 1968 Cadillac Eldorado (FWD) uses the same 900-15 bias-ply tire size. That keeps fitment simple at the sub-model level, since the tire-size question does not change within this application.

Even with shared fitment, tire selection can still vary depending on the owner’s goal for the car. A period-style presentation may point toward one of the available whitewall bias-ply options, while road-use preferences may lead to a comparison with radial-equivalent sizes. It is still smart to confirm the wheel setup on the actual vehicle before changing construction or sidewall style.

For the 1968 Cadillac Eldorado, 900-15 is the primary bias-ply tire size. That construction matches the vintage numeric format used on many American luxury cars of the period and preserves the traditional look associated with late-1960s fitment.

Bias-ply and radial tires should not be treated as interchangeable simply because they may share a similar intended application. Owners considering a change should compare wheel width, tire dimensions, and vehicle clearance before switching construction. The choice also affects the car’s appearance, so it helps to decide early whether the goal is period-style presentation or a radial alternative with a different visual character.

Radial equivalents for 900-15 include 235R15, P235/75R15, P255/70R15, and 820R15. Those cover an 80-series metric radial, a 75-series P-metric radial, a 70-series P-metric radial, and a bias-look radial alternative.

Each of those sizes gives the buyer a different way to approach a radial conversion, but none should be assumed to fit automatically. The associated rim-width range for these equivalents is 6-8 inches, and wheel width, overall tire dimensions, and vehicle clearance all matter before making the switch. Checking the actual wheels on the Eldorado is especially important if anything has been changed from stock.

Yes, 820R15 is available as a bias-look radial equivalent for the 1968 Cadillac Eldorado’s 900-15 primary size. That gives owners a radial-format option that aims to retain a more traditional visual presentation than a modern-looking metric sidewall.

A bias-look radial can be appealing when the goal is to preserve a vintage appearance while considering a different construction. It still needs the same careful fitment review as any other radial alternative, including wheel width, overall dimensions, and clearance around the body and suspension. Appearance alone should not drive the decision without confirming that the actual wheel and vehicle setup support the change.

Start with the primary fitment: 900-15 bias-ply on a 15-inch rim. From there, the main considerations are how the Eldorado will be used, whether the owner wants to keep the stock-style construction, and which sidewall treatment best suits the car’s appearance.

Product details matter once the size is settled. Some 900-15 options focus on traditional whitewall styling in the Silvertown Classic Bias Ply series, while another is a drag-race-oriented blackwall slick. Wheel-width compatibility, load specifications such as 1920@32 psi where stated, and the car’s intended use all help narrow the choice without guessing from size alone.

The available 900-15 tires for the 1968 Cadillac Eldorado include triple-white-stripe, dual-white-stripe, narrow whitewall, and blackwall sidewall treatments. Those options create very different visual results even though they share the same primary tire size.

Sidewall style should match the presentation the car is meant to have. A whitewall treatment typically supports a more formal late-1960s luxury-car look, while a blackwall drag slick serves a much more specialized purpose. Because sidewall choice affects appearance more than fitment, it is smart to settle the intended look first and then compare the tire series and use type within that style.

BFGoodrich and M&H Racemaster offer 900-15 tires for the 1968 Cadillac Eldorado. BFGoodrich appears in the Silvertown Classic Bias Ply series with several whitewall presentations, while M&H Racemaster offers a Vintage Drag Slick blackwall in the same size.

Brand alone should not make the decision. The stronger dividing line here is the tire’s intended character, since the BFGoodrich choices emphasize traditional street-oriented vintage appearance and the M&H Racemaster option is purpose-built for drag-race use. Comparing sidewall style, tire series, rim-width suitability, and stated load information will usually tell an Eldorado owner more than the brand name by itself.

A 900-15 bias-ply tire is the natural starting point for a period-style 1968 Cadillac Eldorado because it keeps the correct-era size format and construction type. Within that size, the available BFGoodrich Silvertown Classic Bias Ply options offer several whitewall presentations that suit a restoration-oriented look.

The best visual choice depends on how formal or restrained the finished car is meant to appear. Triple-white-stripe, dual-white-stripe, and narrow whitewall treatments each change the car’s stance and character without changing the primary fitment. When exact originality matters, it helps to compare the tire choice against marque-specific references and the car’s own historical documentation rather than relying on appearance alone.

Tire construction changes more than ride behavior on a restored 1968 Cadillac Eldorado; it also changes the car’s visual character. A 900-15 bias-ply keeps the vintage sizing format and traditional profile associated with the period, while radial alternatives introduce a different look even when chosen as equivalents.

That matters on a large front-wheel-drive Cadillac where tire presence contributes heavily to the finished stance. Owners who want a more traditional presentation often stay with bias-ply or explore a bias-look radial such as 820R15 rather than moving straight to a modern P-metric appearance. Construction choice should be made alongside wheel and clearance checks so the visual goal and the actual fitment stay aligned.

Yes. Modifications can affect tire fitment on a 1968 Cadillac Eldorado even when the original size is 900-15. Wheel changes, altered wheel width, suspension work, ride-height changes, or body and brake modifications can all change what clears the car safely.

That matters most when considering a radial equivalent or a specialized tire rather than staying with the stock-style setup. A 15-inch rim diameter by itself does not guarantee compatibility, because width and available space are just as important. Measuring the actual wheels and checking clearance at the fenders, steering stops, and suspension points helps avoid problems that a catalog-size match alone cannot catch.

Before driving a 1968 Cadillac Eldorado on new tires, inspect the wheels, valve stems, lug hardware, and the tires themselves for proper seating and inflation. It is also worth checking for visible interference at full steering travel and looking over suspension and steering components for wear.

A large collector car can mask problems until it is already on the road, so a careful first inspection is important. Sidewall contact, rubbing marks, vibration, air loss, and uneven stance should all be watched for during the first short drive. On a car that has spent long periods parked, checking brakes, alignment condition, and general chassis health is just as important as mounting the right tire size.

Collector-car 900-15 tires should be kept at the appropriate pressure for the tire and regularly inspected for cracking, bulges, cuts, and uneven wear. Even on a lightly driven 1968 Cadillac Eldorado, age and storage conditions can affect tire condition long before tread wears out.

Long-term care matters because vintage cars often sit more than they drive. Clean, dry storage away from prolonged sunlight, excess heat, and ozone sources helps preserve sidewalls, and occasional movement can reduce flat-spotting from extended parking. A routine walkaround before driving, including pressure checks and a look for air loss or sidewall deterioration, is a good habit for any Eldorado that sees intermittent road use.