Three Prime eBike 9-Speed Cassette – High-Performance 12-50t Compact Design

The Box Three Prime 9 Cassette redefines versatility for cyclists who demand both power and precision on their rides. Engineered to rival high-end drivetrains without sacrificing simplicity, this compact yet robust cassette delivers an expansive gear range of 12-50T—matching the climbing and descending capabilities of many 12-speed systems while streamlining shifts with just nine gears. Perfect for e-bike riders and trail enthusiasts alike, its design balances performance with practicality, ensuring smoother transitions whether tackling steep climbs or maintaining speed on flat terrain.

Crafted from durable steel cogs pinned securely to lightweight alloy spiders, the Prime 9 combines strength with optimized weight savings through strategically placed ventilation holes that shed rotational mass without compromising reliability. This construction makes it ideal for riders seeking a durable drivetrain solution that can handle heavy loads from electric-assist bikes or frequent off-road use while remaining agile on climbs.

Designed for seamless integration, the Prime 9 works flawlessly with standard HG freehub bodies and is compatible with Shimano/SRAM 8-, 9-, and 10-speed setups, offering broad adaptability across bike models. Its sleek black finish not only complements modern builds but also enhances corrosion resistance for long-lasting performance in all conditions—from rainy commutes to dusty trails.

Why Choose the Box Three Prime 9?
| Feature | Box Three Prime 9 | Competitor’s 12-Speed Cassette |
|—————————|—————————–|————————————|
| Gear Range | Full 12-50T coverage | Similar range |
| Number of Gears | Streamlined 9-speed | Cluttered 12-speed |
| Weight | Lighter by up to 20% | Heavier |
| Durability | Pin-reinforced alloy spiders | Standard steel construction |
| E-Bike Readiness | Optimized for torque demands | Often incompatible |
| Maintenance | Fewer parts = less upkeep | More components = higher wear |

Whether you’re conquering technical singletrack or commuting daily on an e-bike, the Prime 9’s wide-range gearing provides confident control on varied terrain while its lightweight build improves pedal efficiency. Say goodbye to overcomplicated gear shifts—this cassette’s consistent progression ensures smooth transitions every time you hit the brakes or accelerate downhill. For riders prioritizing reliability without bulk, the Box Three Prime 9 offers a smart upgrade that bridges high-performance needs with everyday practicality.