Taiwan Samuel 12 Speed Steel Cassette | FLYMaster CNC One-Piece Steel for Shimano & Sram

Samuel FLYMaster 12-Speed CNC Monoblock Steel Cassette

Made in Taiwan
Tested, trusted and proven by professionals.

Key Highlights

• One-piece solid Cr-Mo steel body — stronger and far more durable than alloy or modular cassettes.
  
  
• Anti-corrosion coating for maximum longevity and smooth operation.
  
  
• Lighter than Shimano Dura-Ace 11-34T (253 g) — only 245 g.
  
  
• 100 g lighter than Ultegra 11-34T (345 g) — significant inertia reduction.
  
  
• XDR version only 255 g, 48 g lighter than SRAM Force XG-1270 (303 g).
  
  
• Slightly heavier than SRAM Red XG-1290 (233 g), but far more durable and cost-efficient.
  
  
• Proudly made in Taiwan, JIS strength & rigidity certified.

Engineered for Pure Performance

The FLYMaster One-Piece Steel Cassette is engineered for riders who demand both stiffness and long-term durability.

Designed and manufactured in Taiwan, it is CNC-machined from a single block of Cr-Mo steel, not welded or riveted.

The dense monoblock steel structure maintains perfect gear alignment and resists wear even under extreme torque.

A multi-layer anti-corrosion coating protects the surface from sweat, humidity, and road debris, ensuring smooth shifting and long service life even in harsh riding environments.

Performance Advantage: Lightweight Inertia Control

A lighter cassette doesn’t just save grams — it changes how your drivetrain behaves.

When descending or sprinting at high speed, a heavier cassette carries more rotational inertia.

If the rider suddenly stops pedaling, the heavy cassette continues spinning forward, pushing the chain slack toward the front derailleur.

This can cause chain overshoot or even chain-drop, especially during explosive sprints.

A lightweight monoblock cassette like the Samuel FLYMaster reduces rotational inertia, allowing the chain to settle instantly and maintain tension when power is cut.
Professional riders have faced such scenarios — even top sprinters like Mark Cavendish have experienced chain-drop incidents during high-speed finishes, illustrating how drivetrain inertia and chain tension fluctuations can become critical under load.

By minimizing the flywheel effect, FLYMaster ensures cleaner shifting and greater drivetrain stability during sudden accelerations or decelerations.

Model Comparison

Design Philosophy

One-Piece Steel Construction

CNC-cut from a single block of Cr-Mo steel — no joints, no weak points, perfect concentricity.

Extended Lifespan

Steel offers superior wear resistance compared to alloy, ideal for long-distance riders and racers.

Corrosion Protection

Advanced coating prevents rust and oxidation, even under sweat or humidity exposure.

JIS Certified

Tested under Japan Industrial Standards for both tensile strength and structural rigidity.

Specifications