Box Three Prime Cassette
Best wide-range drivetrain upgrade for riders seeking simplicity and durability.
This rear derailleur offers a wallet-friendly option with essential features for a smooth riding experience. It incorporates a limited slip clutch to manage chain tension and sealed bearing pulleys for efficient operation. Its robust construction ensures durability, and it boasts impressive versatility, being compatible with a wide range of cassette sizes, including 11-46t and 11-50t options. This makes it a highly adaptable choice for various Prime 9 drivetrains.
$72.99
at
Roy's Cyclery
More Prime 9 options
Who it's for
- Mechanics and riders preferring simpler, more durable drivetrain maintenance
- Budget-conscious cyclists seeking wide-range gearing without premium pricing
- Cyclists using standard Shimano HG hubs avoiding proprietary driver upgrades
Who should skip it
- Road cyclists needing tight gear spacing for consistent pedaling cadence
- Weight-weenies prioritizing minimal rotating mass for climbing performance
- Aggressive riders demanding crisp, instant shifting under high power
Performance breakdown
Drivetrain Simplicity
Nine gears deliver massive range without the complexity of modern twelve-speed systems.
Compatibility
Standard HG freehub mounting makes upgrading older bikes incredibly straightforward.
Durability
Stamped steel construction handles high torque loads with impressive long-term resilience.
Weight Efficiency
Alloy spiders and weight-reducing holes keep mass manageable for a steel cassette.
Climbing Range
The 50T cog provides serious leverage for tackling the steepest local climbs.
Shift Progression
Consistent gear steps offer predictable cadence changes across the entire wide range.
Key Specs
Drivetrain Speeds
9
Cassette Body Type
Shimano/SRAM 8, 9, 10 Speed
Largest Cog
50T
Smallest Cog
11T
Material
Steel and Alloy
Color
ED Black
Mounting Standard
HG
Know before you buy
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