Michelin 99394 Pilot Sport AS 4 255/45R21 106V All-Season Ultra High Performance Tire

The Michelin Pilot Sport AS 4 (MPN 99394) is an all-season ultra-high performance passenger car tire designed to deliver exceptional year-round grip without sacrificing wear life or dry-weather performance. Sized at 255/45R21 106V, this tire is engineered for drivers who demand both spirited driving dynamics and all-weather confidence.

Key Features:

• Dynamic Response Technology – Distributes forces and temperatures evenly across the contact patch for extended, even tread wear
• Asymmetric Tread Pattern – Places increased rubber mass on the outer shoulder for exceptional lateral grip during cornering
• Full-Depth Interlocking Sipes – Provide biting edges throughout the life of the tire for consistent wet and light-snow traction
• Helio Plus Technology – Advanced rubber compound maintains pliability and road grip even in near-freezing temperatures
• Winter-Ready Tread Grooves – Biting edges in the grooves engage loose snow to improve acceleration and braking control in winter conditions

Warranty Coverage:

• 45,000-mile Manufacturer's Treadwear Limited Warranty (Speed Rating: Y, W sizes)
• 30,000-mile Manufacturer's Treadwear Limited Warranty (Speed Rating: (Y) / ZP Run-Flat sizes)
• Standard Manufacturer's Limited Warranty on all sizes

Select sizes are available with ZP (Zero Pressure) Run-Flat Technology, allowing continued mobility after a complete loss of air pressure. The Pilot Sport AS 4 is Michelin's premium choice for performance vehicles that require confident handling across all four seasons.