Firestone | 500/525-16

The 500/525-16 Firestone Classic Blackwall Bias Ply Tire is sized to fit select 1947–1954 Austin A40 models and 1947–1953 Jowett Javelin vehicles as listed in the PDP fitment chart. Mounting on the correct rim width between 3.00 and 3.25 inches ensures proper bead seating and avoids stress on the sidewall. Using rims outside the recommended width may lead to uneven wear or compromised handling.

Owners should confirm factory wheel dimensions in their owner’s manual and consider fender clearance under suspension compression. This tire’s overall diameter of 26.50 inches and section width of 5.26 inches directly impact ride height and wheel well fit, particularly on vehicles with restored or lowered suspensions.

Yes, the 500/525-16 Firestone Classic Blackwall Bias Ply Tire fits select 1948–1951 Porsche 356 Pre-A and 1951–1955 Singer SM Roadster models. Correct rim width and careful bead mounting are critical to maintaining the intended contact patch and authentic sidewall appearance. Using period-accurate tires preserves historical aesthetics and handling characteristics.

Vehicle owners should also consider steering effort changes due to the 5.26-inch section width and bias ply design. Bias ply tires produce slightly higher steering resistance compared to modern radials, particularly at low speeds, and adjustments in tire pressure may be required for optimal drivability without compromising authenticity.

The 500/525-16 size is a traditional pre-metric designation commonly used on vintage American and European vehicles. The section width is approximately 5.25 inches with an overall diameter near 26.50 inches. While not directly equivalent to modern metric sizing, a careful comparison to 135/80-16 or similar width-diameter combinations can provide a reference for tire replacement in hybrid restorations.

Owners should not rely solely on modern equivalents for load and sidewall behavior. Bias ply construction, aspect ratio, and rim width requirements remain unique to this tire, ensuring authentic appearance and proper contact patch for classic applications.

The 500/525-16 Firestone Classic Blackwall Bias Ply Tire’s nominal 5.25-inch section width translates roughly to 133 mm, while the 26.50-inch overall diameter corresponds to approximately 673 mm. This conversion aids in comparing with modern metric tires, though exact performance characteristics will differ due to ply construction and sidewall profile.

When referencing metric equivalents, consider inflation pressure, rim width, and load rating to ensure the tire remains appropriate for the vehicle. Bias ply tires maintain different flex patterns and contact patch behavior than modern radials, so metric comparison should be used only as a reference for planning purposes.

The 500/525-16 sits nominally between 5.00-16 and 5.25-16 tires. Its section width of 5.26 inches and 26.50-inch overall diameter offer slightly more tread footprint than 5.00-16, which can increase stability but also steering effort. Compared to 5.25-16, the difference is minimal, mainly affecting stance and sidewall flex.

Owners should consider fender clearance, especially with restored or lowered vehicles. The bias ply construction accentuates sidewall movement, influencing ride comfort and pavement feedback. Matching overall diameter with the vehicle’s original specifications ensures correct speedometer readings and suspension geometry.

The 500/525-16 Firestone Classic Blackwall Bias Ply Tire offers authentic period-correct performance, but bias ply construction causes the tire to flex under load, following pavement irregularities more than modern radials. On smooth highways, steering remains responsive, but at sustained higher speeds, slight wandering or tracking variations may occur.

Proper inflation at 30 psi and attention to load limits maintain tread integrity and reduce heat buildup. Highway use is suitable for cruising and show purposes, though owners should anticipate higher steering effort and minor ride harshness compared to contemporary radial tires.

Bias ply tires, including the 500/525-16 Firestone Classic Blackwall, offer adequate traction on wet pavement due to the original Firestone tread pattern. The 12/32-inch tread depth helps channel water, but these tires may hydroplane slightly sooner than modern radials due to narrower tread width and sidewall flex.

Drivers should moderate speed in heavy rain, maintain recommended inflation, and allow for slightly increased stopping distances. Observing cautious cornering ensures safe handling while preserving both tire and vehicle authenticity.

The 500/525-16 Firestone Classic Blackwall Bias Ply Tire is ideal for both show and light daily driving. Its blackwall styling preserves authentic aesthetics, while bias ply performance delivers period-correct handling and ride feel. Highway cruising is acceptable when speed and load limits are respected.

Owners should monitor inflation, avoid overloading, and rotate tires to maintain even wear. For competitive or prolonged highway use, consider the tire’s flex characteristics and anticipate slight steering effort variations and contact patch behavior consistent with its original design intent.

The 500/525-16 Firestone Classic Blackwall Bias Ply Tire features plies running at 45-degree angles crisscrossing from bead to bead. This provides strength and preserves historical authenticity. Bias ply tires flex differently than radial tires, causing sidewalls to follow pavement breaks and increasing steering feedback.

Owners should note that this construction affects ride comfort, heat buildup, and directional stability. Correct inflation at 30 psi and adherence to the 750-pound load limit ensures consistent performance and preserves structural integrity for vintage and collector vehicles.

The 4-ply polyester construction of the 500/525-16 Firestone Classic Blackwall Bias Ply Tire balances authenticity with adequate strength for vintage vehicles. Multiple overlapping layers distribute load and resist sidewall bulging while maintaining correct tire profile.

Despite being thinner than modern tires, the polyester plies provide sufficient support for typical collector car use. Monitoring inflation and avoiding sustained overloading prevents premature wear and ensures the tire performs safely on U.S. roads.

This tire carries a maximum load of 750 pounds at 30 psi. Exceeding this limit may compromise sidewall integrity, increase heat buildup, and reduce lifespan. Proper inflation is critical to achieving this load rating safely.

Owners with vehicles that have been modified with heavier engines, suspension upgrades, or larger brakes should confirm total vehicle weight and distribute it evenly across all tires. Adhering to the load rating preserves structural safety and road performance.

The 500/525-16 Firestone Classic Blackwall Bias Ply Tire should be checked regularly with an accurate tire pressure gauge because bias ply construction can be more sensitive to inflation changes than modern radial tires. Proper inflation helps maintain the intended sidewall shape, steering response, and contact patch behavior. Since mounted dimensions can vary with rim width and inflation pressure, maintaining the recommended pressure for your vehicle application is important for consistent handling.

Overinflation can reduce ride comfort and make the tire feel less compliant, while underinflation can increase sidewall flex, heat buildup, and uneven wear. Classic vehicles often sit for extended periods, so check pressure before driving after storage and monitor pressure changes during seasonal temperature fluctuations.

The 500/525-16 Firestone Classic Blackwall Bias Ply Tire should be stored in a clean, dry location away from direct sunlight, extreme temperatures, moisture, and sources of ozone such as electric motors or generators. Proper storage helps preserve the rubber compound and maintains the appearance of the classic blackwall sidewall design. Before storage, clean the tires using products suitable for classic tire finishes and avoid harsh chemicals that may damage the rubber.

For vehicles stored on display or during long periods of inactivity, maintaining proper inflation and reducing prolonged flat spotting can help protect the tires. If possible, move the vehicle periodically or use appropriate storage supports to reduce continuous load on one section of the tire. Inspect the 500/525-16 Firestone Classic Blackwall Bias Ply Tire before returning the vehicle to regular driving.