Difference between new and used padel balls - what you feel, what you measure, and when it matters

What actually changes in a padel ball over time?

To assess the difference between new and used balls, we need to know what actually changes. Three things happen simultaneously:

1. Internal pressure drops. It starts with approximately 10.5-11 PSI internal overpressure and drops through the porous rubber core. It falls to around 7-9 PSI after 2-3 weeks of normal play and regular tube storage.

2. Felt cover wears. Every contact with the racket, glass wall, and court scrapes off small amounts of felt. The felt becomes thinner, lighter, and loses its original structure. This marginally changes air resistance and noticeably affects spin.

3. Rubber core changes character. The porous structure also wears due to compression. Over time, the core becomes slightly less elastic and a bit more sluggish - even if the pressure is kept constant. This is a slower process, but after several months, it contributes to the "dead" feeling.

Together, these three processes define the difference between new and used balls. The first is the fastest and the one we react to the most.

Bounce - the objective measurement

A bounce test is the only measurement we have that doesn't depend on whether we believe there's a difference. Drop the ball from a height of 254 cm onto a hard surface and measure how high it bounces. Physics is honest - it doesn't lie.

Expected bounce at different stages (Balcour estimate based on reported patterns and FIP standard, not laboratory data):

The objectively measurable difference in bounce between a new ball and a ball used for 1 week is approximately 10-13 cm. This is a noticeable - but not dramatic - difference. Between a new ball and a 4-week-old ball, you lose 25-50 cm of bounce. That's a significant difference. You'll feel it.

The sound, contact time, and playing feel

The measurable differences have consequences for the playing feel. Here's what players typically report and what underlies it.

The sound changes from "pop" to "thud." A fresh ball makes a short, clean impulse sound against the racket because it is stiff and elastic. A softer ball has a longer contact time with the string bed, which dampens the high-frequency components of the sound. This is the same principle as the difference between hitting a dry plate versus a wet plate with a hammer.

Contact time on the racket becomes longer. A softer ball "sticks" to the string bed for a fraction of a second longer. This provides more control over direction and spin, but less speed. This is one reason some players prefer used balls for drills where precision is more important than power.

The ball flies flatter and slower. Lower internal pressure results in lower energy in each shot, which is seen as a lower parabola through the air plus a lower maximum speed. This is a large part of why used balls feel "tired."

Spin reacts differently. The felt structure changes with use, and this changes how the string bed can grip the ball for topspin and slice. Many players experience that new balls take more topspin, and used balls slide out of the string bed more without accumulating rotation.

When do even experienced players not notice a difference?

There's a point where the difference between new and used balls disappears into the noise of everything else that varies - the day's form, the court's humidity, your own pace. Below that threshold, the difference is real, but it's small enough that most club players cannot reliably distinguish in a blind test.

Realistic threshold (based on common player feedback, not a formal blind study):

• Beginner/recreational: Notices a difference between a new ball and a 4+ week old ball. Does not notice a difference between a 1-week and 2-week ball.
• Club player (DPF 2-4): Notices a difference between new and 2 weeks. Does not reliably notice a difference between new and 4-5 days.
• Competitive club player (DPF 5-6): Notices a difference down to 1-2 games with reasonable reliability. Noted small fluctuations in pace.
• Tournament player: Notices a difference after just 1-2 games. For this reason, they change balls after approximately 9 games in FIP tournaments.

Conversely, this also means: if you are a recreational player and have just changed tubes, it's not because a brand new ball plays much differently than the 4-day-old one you took out. It's because the clearly worn one you were playing with was far gone.

Table: new vs. 1 week vs. 2 weeks vs. 4 weeks

This is the central comparison table - what you can expect at each stage:

The table is based on the same assumptions as our previous article on padel ball bounce height and is consistent with FIP specifications and common Danish club practice.

What this means for your ball consumption

The difference between new and used balls is not abstract - it costs money. A realistic calculation for a club player who plays 2-3 times a week and requires a "fresh" level:

Assumptions:

• 2-3 padel sessions per week, 1.5 hours each
• Plays at FIP-approved level (bounce > 135 cm) for match play
• A tube of 3 padel balls costs approximately 60 DKK
• Balls fall out of the FIP window after approximately 10-14 days of normal use

Result:

• Approximately 2-3 tubes per month = 120-180 DKK per month
• Approximately 24-36 tubes per year = 1,440-2,160 DKK per year on balls alone

That's the real price tag for insisting on fresh-feeling balls. If you lower your level requirements and accept club-play balls with 86-95 percent bounce (1 week of use), you can stretch each tube for 2.5-3 weeks and halve the expense. This is the trade-off between feel and economy that each player makes every time they face the choice of opening a new tube or using the semi-used one. If you want to calculate the numbers for your own setup, the full calculation of how much padel balls cost per year is available here.

How to keep the ball close to "new"

The difference between new and used balls is primarily driven by pressure loss. If you stop that, you stop much of the difference. This is the principle behind active pressure retention.

• Put the balls back in the tube with the lid on after play. Approximately halves passive diffusion.
• Stable 18-22 degree storage. Reduces accelerated diffusion from heat.
• Rotate between tubes. Allows each set of balls to rest without use in between.
• Active pressure retention. The only thing that truly stops passive pressure drop. Pressurebox Pro maintains approximately 10-11 PSI around the balls 24/7, so there is no pressure gradient for diffusion. This significantly extends the "new-feeling" part of the ball's life.

If you want to delve further into the subject, we have a larger guide to the lifespan of padel balls, a technical explanation of why balls lose pressure, and the corresponding set of signs for worn tennis balls.

The felt is a separate wear mechanism you can read more about in the article on padel ball felt quality. If your balls have survived a Danish winter, then the winter storage guide for padel balls is worth reviewing before your first session.