550-15 Excelsior Bias Ply Blackwall Tire
Excelsior Tires offer beautiful European styling and design in an extensive range of beaded edge and straight side wall sizes. Excelsior tires feature durable nylon cord construction. These tires feature authentic antique tire tread designs and sidewall markings and are an excellent choice for antique restorations. Please note that dimensions listed tread width, section width and overall diameter are non-scientific and based on an inflated tire, mounted on a wheel. Dimensions may vary due to rim width and inflation pressure.
Blackwall Tire
Since the introduction of carbon black rocked the tire industry, the original recipe for most tires has been a solid black sidewall. For classics and collector cars alike, it's hard to beat the no-nonsense appeal of a classic blackwall style tire. British sports car, classic truck and even hot rod enthusiasts love the way a nice period correct blackwall tire looks on their vehicles.
Bias Ply Construction
Bias ply tire construction is a method that was used from the 1900's through the 1970's on passenger cars and light trucks. Bias ply tires feature ply cords that run at a 45 degree angle to the bead, and overlap in a crisscross pattern, depending on how many ply layers are used. This creates a strong tire, but bias ply tires have a tendency to follow breaks or ruts in the pavement. Bias ply tires are the most authentic choice for classic car restorations and traditional hot rod builds. Coker Tire offers a huge variety of bias ply tires for many applications.
Excelsior Bias Ply Tires
Excelsior bias ply tires offer hard-to-find sizes and styles for a wide variety of American and European classic cars. This size selection includes fitments for metric rims, and other unique European sizes.
Excelsior Vintage Tires
Excelsior tires feature vintage designs that are excellent for restored race cars, hot rods and custom builds. The Excelsior Roadster Radial is an all new Bias Look radial designed to look exactly like a bias ply and still provide great radial performance. This revolutionary tire works for both the Hot Rod and Restoration enthusiast segments. The Stahl Sport Radial is extremely popular with hot rodders who love to drive their cars, both for their stylish good looks and for their long-wearing performance on the road. From authentic Bias ply tires to cutting edge innovations for collectors, there's an Excelsior tire for your Antique application.
Please Note
- Tire mounted on wheel for demonstration purposes only. Wheel and other accessories are not included. Please note that dimensions listed (tread width, section width and overall diameter) are non-scientific and based on an inflated tire, mounted to a wheel. Dimensions may vary due to rim width and inflation pressure. Please note Chemical Guys Tire and Rubber Cleaner and Adams Polish Tire shine has been linked to Whitewall browning and should not be used. We recommend using our line of tire care products.
| SKU | 556642 |
|---|---|
| Weight | 23.000000 |
| Availability Date | 2026-10-30T00:00:00Z |
| Sidewall Style | Blackwall |
| Tire Construction | Bias Ply |
| Construction Ply | 4 PLY NYLON |
| Tire Series | Excelsior Bias Ply |
| Speed Rating | P |
| Rim Diameter | 15 inch |
| Tube Type or Tubeless | Tubeless |
| Product Size | 550-15 |
| Width Bias Ply | 5.50 |
| Brand | Excelsior |
| Load Index | 72 |
| Section Width (IN) | 5.25 |
| Rim Width (in) | 3.00 - 3.50 |
| Overall Diameter (IN) | 25.87 |
This Excelsior comes in the 550-15 size, suitable for the classic and collector vehicles listed below.
About the 550-15 Tire Size
The 550-15 is a vintage tire size associated with a range of compact classic vehicle applications spanning 1942 through 1962. On this product page, the Excelsior is offered in that 550-15 size as a bias ply tire, making it relevant for vehicles associated with this fitment range, including applications from Willys, Studebaker, Holden, MG, Morris, Wolseley, Hillman, and others. For more detailed information on this tire size, explore the 550-15 tire on Coker Tire Fitment Guide.
550-15 Tire Size Alternatives
| Alternative Type | Tire Size | More Information | Products |
|---|---|---|---|
| Modern Radial Equivalent | 155R15 | 155R15 Tire Fitment Guide | 155R15 Products for Sale |
| Modern Radial Equivalent | 560R15 | 560R15 Tire Fitment Guide | 560R15 Products for Sale |
Vehicle Fitment for the Excelsior | 550-15
The Excelsior | 550-15 is available in a tire size associated with a range of classic and collector vehicles. The vehicle applications below are organized by year, make, and model to help identify vehicles associated with the 550-15 size. Explore the linked Make & Model and Year Make & Model pages for more detailed fitment information.
Fitment information should be verified for the specific vehicle before purchase. Confirm tire size, wheel fit, load requirements, overall diameter, and available clearance.
1942–19451 make · 1 fitment
The 1942–1945 period includes a Willys application associated with the 550-15 tire size. This is a focused early fitment range for this size.
Willys
Willys fitment in this period is represented by the American 442.
1946–19506 makes · 10 fitments
The 1946–1950 period includes 550-15 applications across Studebaker, Holden, Morris, Wolseley, and MG, along with an additional Holden application beginning in this range. These applications show the broadening use of the 550-15 size across several makes.
Studebaker
Studebaker applications in this period include the Champion.
Holden
Holden applications in this period include the 48/215.
Morris
Morris applications in this period include the Oxford.
Wolseley
Wolseley applications in this period include the 50.
MG
MG fitment in this period is represented by the Midget.
1951–195510 makes · 33 fitments
The 1951–1955 period includes the broadest spread of 550-15 applications, spanning Allard, Austin-Healey, Hillman, Holden, MG, Morris, Simca, Studebaker, Triumph, and Wolseley. This range covers a wide mix of vehicle applications associated with the 550-15 size.
Holden
Holden applications in this period include the 48/215 and FJ.
MG
MG applications in this period include the Midget and Magnette.
Morris
Morris applications in this period include the Oxford.
Wolseley
Wolseley applications in this period include the 50 and 4/44.
Allard
Allard fitment in this period is represented by the Palm Beach.
Simca
Simca fitment in this period is represented by the Aronde.
Triumph
Triumph fitment in this period is represented by the Mayflower.
Hillman
Hillman fitment in this period is represented by the Mark VIII.
Austin-Healey
Austin-Healey fitment in this period is represented by the 100.
1956–19605 makes · 8 fitments
The 1956–1960 period includes continued 550-15 applications for Hillman, Holden, MG, Morris, and Wolseley. This range reflects a narrower but still varied group of vehicles associated with the size.
Hillman
Hillman applications in this period include the Mark VIII and Minx.
Holden
Holden fitment in this period is represented by the FJ.
MG
MG applications in this period include the Magnette and Midget.
Morris
Morris fitment in this period is represented by the Oxford.
Wolseley
Wolseley fitment in this period is represented by the 4/44.
1961–19651 make · 2 fitments
The 1961–1965 period includes Hillman applications associated with the 550-15 tire size. This is a narrow later fitment range centered on a single make.
Hillman
Hillman fitment in this period is represented by the Minx.
Frequently Asked Questions
Fitment & Compatibility â–¼
Will the Excelsior 550-15 Bias Ply Blackwall Tire fit my vintage European or British car setup? â–¼
The Excelsior 550-15 Bias Ply Blackwall Tire is specifically designed for smaller vintage European and British vehicles from the late 1940s through early 1960s. With a 25.87-inch overall diameter and narrow 5.25-inch section width, it matches original fitment requirements for cars like MG, Austin-Healey, and Morris models that used slim-profile tires and narrow wheels.
The recommended rim width of 3.00 to 3.50 inches is critical for proper fitment. Installing this tire on wider rims can distort the contact patch and compromise handling. Always verify your factory wheel width and clearance, especially if your car has been modified or fitted with aftermarket wheels.
Will the Excelsior 550-15 Bias Ply Blackwall Tire work with disc brake conversions? â–¼
The Excelsior 550-15 Bias Ply Blackwall Tire itself does not interfere with brake systems, but fitment depends on wheel clearance. If your vehicle has been upgraded with disc brakes, ensure your wheels provide sufficient caliper clearance while still maintaining the correct 3.00 to 3.50-inch width.
Some disc brake conversions require different wheel offsets or designs, which may conflict with narrow bias ply tire fitment. Always test fit the wheel and tire combination before final installation. Clearance between tire sidewall and brake components should also be verified under load conditions.
Tire Size Equivalents & Conversions â–¼
What modern radial size is equivalent to the Excelsior 550-15 Bias Ply Blackwall Tire? â–¼
The closest radial equivalent to the Excelsior 550-15 Bias Ply Blackwall Tire is typically 155R15. This radial size offers a similar overall diameter and width, making it a common replacement for drivers seeking improved ride comfort and highway performance.
However, switching to a radial changes handling characteristics significantly. Radials provide better grip and stability but lack the authentic feel and appearance of bias ply tires. If originality is a priority, the Excelsior 550-15 remains the correct choice.
How does the Excelsior 550-15 Bias Ply Blackwall Tire compare to a 560R15 radial? â–¼
The 560R15 radial is another close alternative to the Excelsior 550-15 Bias Ply Blackwall Tire, offering similar diameter and load capacity. This makes it a viable option for drivers who want a radial tire while maintaining approximate original sizing.
Despite similar dimensions, the radial construction will provide a wider contact patch and different sidewall behavior. This can affect steering response and ride comfort. Choosing between the two depends on whether authenticity or drivability is the primary goal.
Will switching from the Excelsior 550-15 Bias Ply Blackwall Tire to a radial affect speedometer accuracy? â–¼
Switching from the Excelsior 550-15 Bias Ply Blackwall Tire to a radial like 155R15 can slightly affect speedometer accuracy due to small differences in overall diameter. Even minor changes can lead to noticeable speed discrepancies over time.
Bias ply tires also deform differently under load, which can further influence rolling circumference. If precise speed readings are important, recalibration or verification using GPS is recommended after switching tire types.
Performance & Use Case â–¼
Is the Excelsior 550-15 Bias Ply Blackwall Tire suitable for daily driving? â–¼
The Excelsior 550-15 Bias Ply Blackwall Tire can be used for occasional driving but is best suited for vintage use rather than daily commuting.
Modern traffic conditions and road speeds may exceed its comfort range. Drivers seeking frequent use may prefer radial alternatives.
Construction, Durability & Load Capacity â–¼
What does the 4 ply nylon construction mean for the Excelsior 550-15 Bias Ply Blackwall Tire? â–¼
The 4 ply nylon construction of the Excelsior 550-15 Bias Ply Blackwall Tire provides durability while maintaining flexibility. Nylon cords offer strength and resistance to wear.
This construction is typical of vintage tires and supports moderate load requirements. It also contributes to the tire’s classic handling characteristics.
How durable is the Excelsior 550-15 Bias Ply Blackwall Tire for long-term use? â–¼
The Excelsior 550-15 Bias Ply Blackwall Tire is durable when used within its intended conditions. Proper maintenance and storage extend its lifespan.
Avoid prolonged exposure to extreme heat and UV to prevent degradation. Regular inspections help ensure continued performance.
Is the Excelsior 550-15 Bias Ply Blackwall Tire built for authenticity or performance? â–¼
The Excelsior 550-15 Bias Ply Blackwall Tire prioritizes authenticity over modern performance.
It is ideal for restorations where original look and feel are essential.
Installation & Maintenance â–¼
Does the Excelsior 550-15 Bias Ply Blackwall Tire require special installation? â–¼
The Excelsior 550-15 Bias Ply Blackwall Tire can be installed using standard procedures but requires attention to proper seating and inflation.
Professional installation is recommended to ensure correct mounting and balance.
What tire pressure should be used for the Excelsior 550-15 Bias Ply Blackwall Tire? â–¼
Proper tire pressure depends on vehicle weight and usage. Maintaining correct pressure ensures even wear and performance.
Underinflation can cause heat buildup, while overinflation reduces contact patch effectiveness.
How often should the Excelsior 550-15 Bias Ply Blackwall Tire be inspected? â–¼
Regular inspections should be performed to check for wear, cracks, or damage.
Frequent checks are especially important for vehicles driven occasionally.
Does the Excelsior 550-15 Bias Ply Blackwall Tire require balancing? â–¼
Balancing is recommended to ensure smooth driving and reduce vibration.
Proper balancing also helps extend tire life.
What maintenance ensures long life for the Excelsior 550-15 Bias Ply Blackwall Tire? â–¼
Maintaining correct pressure, regular inspections, and proper storage are key to longevity.
Avoid harsh chemicals and monitor wear patterns to ensure optimal performance.
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