The stiffness rating of 69 greatly improves the racket's power, with little distortion on impact.

When choosing your racket, keep the following in mind:
Stiff frame: > 64 – 66 RA
Flexible frame: < 64 – 66 RA.

The stiffer the frame, the shorter the contact time: you lose control but gain power.

An inertia of 285 prevents the frame from distorting during fast acceleration, delivering power and precision. The higher the inertia, the harder the racket is to swing and manoeuvre, but the greater the power. The lower the inertia, the easier the racket is to swing and manoeuvre, providing more control but less power

The size of the TR890's head (640 cm²) provides power, forgiveness and powerful spin.
Its open 16 x 19 stringing pattern accentuates spin.

Further information:
- Midsize – small head size: < 97 inch² or 625 cm²
- Mid plus (MP) – standard head size: 97-105 inch² or 626-677 cm²
- Oversize (OS) – large head size: 106-115 inch² or 678-742 cm²
- Super oversize – very large head size: > 116 inch² or 742 cm².

Its weight (285 g) provides a good combination of power and manoeuvrability.

For your information:
- Less than 260 g: lightweight rackets, for comfort and easy handling.
- 260 to 295 g: classic rackets (intermediate) for versatility.
- 300 to 315 g: rackets for players with good technique.
- > 315 g: rackets for high-level competitors with a strong game.