Q: I’m currently using 39°/2.1mm Provincial Hurricane, but I feel it lacks power. Should I switch to 40°/2.1mm or 39°/2.15mm?
This is a classic question. In the same rubber model, increasing either the hardness or the thickness will improve support and power to some extent, but the feedback and feel are completely different:
1. Increasing Hardness (40°/2.1mm): Higher Hardness, Same Thickness
- Feel: The sponge will feel significantly stiffer. At lower impact speeds, it is harder to “penetrate” the sponge, and the feedback feels very direct and rigid.
- Performance: The support is significantly enhanced, providing a much higher power ceiling. If you have good active power and can fully compress the sponge, this version produces the maximum explosive power.
- Best for: Players seeking maximum explosive power and a strong, aggressive offensive game.
2. Increasing Thickness (39°/2.15mm): Same Hardness, Higher Thickness
- Feel: The perceived hardness remains the same, but the sponge is thicker. At medium-to-low impact speeds, the difference is subtle, and it maintains a better “ball-eating” feel (dwell time) and control.
- Performance: The support is slightly better than the 2.1mm version. However, because the sponge is thicker, you might feel the rubber is not as “transparent” as before—what we call “harder to bottom out.”
- Best for: Players who want to keep their original feel but need slightly better cushioning and support during heavy loops.
💡 Why do professional players prefer “Higher Hardness” over “Higher Thickness”?
This involves a piece of expert equipment knowledge—the 4.0mm Rule:
- ITTF Regulation: The total thickness of the top sheet + sponge + glue + booster (expansion oil) must NOT exceed 4.0mm.
- Risk of Violation: A 2.15mm sponge, after multiple layers of booster and thick glue, very easily exceeds the 4.0mm limit. If a racket is caught during a random inspection at a tournament, the player is disqualified.
- The Pro Choice: For safety, pro players usually stick to a 2.1mm thickness and gain more power by increasing the hardness (e.g., switching to 41° or 42°).
Final Recommendation:
- If you want more power, stronger support, and are confident in your own stroke power: Choose 40°/2.1mm.
- If you want to keep the same dwell time and feel, but feel the 2.1mm is a bit too thin or “bottoms out” too easily: Choose 39°/2.15mm.