Yonex BG 66 Ultimax Badminton String

The Yonex BG66 Ultimax (BG66UM) is widely considered the ultimate formula for technical speed, razor-sharp control, and explosive repulsion. It is one of the most popular choices among elite international professionals and advanced club players who want maximum feedback and speed.

If BG65 sits at the extreme end of the durability spectrum, BG66 Ultimax sits squarely at the pinnacle of sheer performance. It exchanges structural thickness for incredible elasticity, making the game feel fast, crisp, and effortless.

Core Construction & Technology

The ultra-thin nature of BG66 Ultimax is precisely calibrated to optimize flight speed and feedback:

1. Ultra-Thin 0.65 mm Gauge: This incredibly slender profile dramatically minimizes wind resistance during high-speed swings and allows the string to stretch and snap back with violent acceleration.
2. High-Intensity Nylon Multifilament: The core uses tightly wound, ultra-fine nylon fibers that give the string its distinctively high elasticity.
3. Special Braided High-Polymer Nylon Outer: Even at 0.65mm, the outer braiding is optimized to give a subtle texture, providing excellent bite and grip on the shuttle's skirt during tight net slices and drops.

Playing Characteristics

1. Repulsion Power (10/10): The snapback effect on this string is effortless. You don’t need a massive, heavy swing to send the shuttle deep to the baseline; a quick flick of the wrist is enough to engage the trampoline effect of the 0.65mm gauge.
2. Control & Net Play (9.5/10): Because the string bed is incredibly responsive, it provides unmatched tactile feedback. You can feel exactly how the shuttle is resting on the face of the racket, making tight net drops, cross-court slices, and deceptive hold-and-flicks highly precise.
3. The Hitting Sound (10/10): BG66 Ultimax produces a beautifully clean, high-pitched "crack" on sweet-spot hits that sounds highly satisfying and dominant on the court.
4. Durability (4/10): This is the major trade-off. At 0.65mm, it has a significantly shorter lifespan than strings like BG65 or BG80 Power. Hard smashers or players who frequently mis-hit the shuttle near the top of the frame may find themselves snapping this string relatively quickly.
5. Tension Retention (6.5/10): It settles and drops its initial tension moderately fast due to how thin and elastic the core fibers are. Advanced players often string it 1–2 lbs higher than their usual reference tension to compensate for the initial drop.

Who is it for?

1. Advanced & Professional Players: Those with highly accurate hitting technique who rarely mis-hit and want premium speed and net precision.
2. Control & Double Players: Ideal for fast-paced mid-court drives, tight net skirmishes, and defensive counter-attacks where rapid reaction speed is key.

Specifications

• Color: Metallic White.
• Gauge / Thickness: 0.65 mm.
• Material Core: High-Intensity Nylon Multifilament.
• Outer Coating: Special Braided High Polymer Nylon Fiber.
• Feel: Medium Feeling (Crisp and highly responsive).
• Main Characteristic: Ultimate Repulsion Power & High Control.
• Country of Origin: Japan.