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Fronway Speedway 56 – 275/40ZRF18 99W Run-Flat

Description: The Fronway Speedway 56 in 275/40ZRF18 99W Run-Flat is an Ultra High-Performance (UHP) tyre that provides exceptional handling capabilities coupled with the essential safety of run-flat technology. This size is typically found on the rear axles of high-powered, staggered-fitment vehicles, including models like the BMW M3/M4, Mercedes-Benz C63 AMG, and high-performance versions of the Ford Mustang and Chevrolet Camaro. It is engineered to transmit high torque to the road while ensuring limited-distance mobility after a puncture.

Key Features and Technical Details:

• Run-Flat Technology (RFT): The primary safety feature is the reinforced, self-supporting sidewall construction. In the event of a total air pressure loss, these robust sidewalls prevent the tyre from collapsing, allowing the driver to continue driving safely for a limited distance (typically up to 50 miles / 80 km) at a reduced speed.

• High Load Capacity: The 99 load index certifies this tyre to support a substantial maximum load of 775kg (1709 lbs) per tyre. This high load rating is critical for managing the significant weight and dynamic forces associated with modern rear-wheel-drive performance cars.

• High-Speed Stability: Rated W (up to 168 mph / 270 km/h), the Speedway 56 is built for sustained high-speed driving. The ‘ZRF’ in the size code confirms a high-performance radial run-flat construction, optimized to handle the extreme centrifugal forces and heat generated by performance driving.

• Asymmetric Tread Design: The wide 275mm tread utilizes an aggressive asymmetric pattern. The robust outer shoulder blocks maximize the contact patch for immense lateral grip during hard cornering, while the continuous center ribs ensure immediate and precise steering response.

• Wet Weather Control: Four wide, deep circumferential grooves are designed for rapid and efficient water evacuation from the footprint. This critical drainage system significantly enhances hydroplaning resistance and improves both braking and traction in wet conditions.

• Optimal Contact Patch: The low 40-series aspect ratio contributes to minimal sidewall flex, ensuring a direct and sharp steering feel. This structure maintains a consistent, optimized contact patch with the road surface, which is vital for maximum grip under acceleration and braking.