Strings

Not two qualities, two structures. What each one does to the ball, to the arm and to the life of the string — and why the player who never breaks is often the worst served.

A ball never meets a string at its stringing tension. The model, the equations and the figures: what string-bed deflection adds in kilos, and why a stiff string takes more of it.

Not a brand, not an adjective: four variables decide — material, gauge, shape, tension. What your current string already tells you, and where to place yourself among the seven numbers.

A racquet does not cure a tendinopathy. It can stop feeding it: frame stiffness, string, tension, swingweight and grip size — and the order in which to change things.

Gear is not the cause of the pain. It can make it easier or harder — shoulder, wrist, forearm, elbow. The levers, in the order they count and what each costs.

“As many times a year as you play per week” is convenient and incomplete. A string ages in three ways, and only one of them is visible.

Tension is not chosen in the absolute: it is chosen for the string you are tensioning. What it really moves, and why copying someone else's number transmits nothing.

Strings are sold on adjectives. An elongation curve, by contrast, can be compared. What eighteen readings say about the range — including the curve still missing.

A string is not a wire, it is a surface. Two rules without exception are enough to know what a structure will give — and what you must never ask of it.

1.20, 1.25, 1.30: diameter is not a feel setting, it is a lifespan setting. The one useful question is the one nobody asks.

The tangential (brushed) strike explains the shape of your racquet and why your gear fits you. The physics of modern tennis, and how to read the Matcheur grid.

Elasticity, linear density, structure: three measured quantities are enough to place a string. That is what ranks the range from N°1 to N°7, and what lets you choose.