AZENIS RT660

The Falken Azenis RT660 is an extreme performance summer tire developed for motorsports enthusiasts and track day participants seeking competition-ready levels of dry traction and handling with DOT-approved street legality. With a 200 UTQG rating, the RT660 occupies the aggressive end of street-legal competition tires while offering impressive durability for its performance level.

The tire features a low-void, symmetric tread pattern that maximizes rubber contact with the surface. Massive shoulder blocks deliver extreme levels of lateral grip for confident cornering, while a broad, continuous center rib provides solid on-center feel and longitudinal traction for both acceleration and braking. The aggressive design prioritizes dry grip while maintaining enough groove volume for light wet conditions.

Internal construction employs a two-ply polyester casing utilizing Falken's Crosshatch Carcass design for enhanced handling and stability. Two wide steel belts support the tread area, reinforced by dual polyamide cap plies that further improve handling precision and high-speed capability. This robust construction maintains consistent contact pressure even under aggressive cornering loads.

Reviewers praise the RT660's ability to deliver exceptional grip from the first lap on cold tires—a significant advantage in autocross where averaged lap times determine standings. The tire also demonstrates remarkable heat tolerance compared to predecessors like the RT615K+, maintaining performance well beyond temperatures where older designs would fade. Users consistently report the RT660 matches or exceeds competitors like the Bridgestone RE-71R in grip while offering better wear characteristics and value.

Note that RT660s run approximately one size larger than marked—a 275/35 performs like a 285. The tire is not intended for near-freezing temperatures, snow, or ice, and like all extreme performance summer tires, requires warmer conditions for optimal performance.