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Stiffness.

Racquet stiffness ratings, flex profiles, and how frame stiffness affects spin, power, and arm strain in your game.

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Racquets ·5 min · June 2026

Racquet Stiffness Is the Number Behind the Control vs Power Debate — Here's What RA 65 Actually Tells You

Start with one number: RA 65. It shows up over and over as the rough line brands and testers draw between a "control" frame and a "power" frame.