Box Three Prime 9 Speed Groupset

The Prime 9 range of components from Box has made many people rethink what a 9-speed drivetrain is capable of. Providing riders with all the range of a 12-speed setup but without the complexity, weight, and excessive shifting, Prime 9 drivetrains are also far more affordable. You can ride them hard and not shed so many tears when something inevitably wears out or breaks.

Box Three is their best all-rounder drivetrain that offers excellent performance and durability at a wallet-friendly price point.

Single-shift groupsets have been designed with e-bikes in mind and feature a 12T smallest cog rather than the 11T found on the multi-shift options.

Who's this item for: This is for riders looking for all the same range as a 12-speed setup with the simplicity and weight savings of a 9-speed setup. It's a great choice for those wanting to bring an older 2x/3x drivetrain bike into the 12 century without needing to re-mortgage the house.

Compatibility: Single-shift groupsets have been designed with e-bikes in mind and feature a 12T smallest cog rather than the 11T found on the multi-shift options.

All Prime 9 components are cross-compatible with other levels across the range. All of these components can be purchased separately if you want to mix and match with other Box Prime 9 parts.

Works with 10,11, or 12-speed Shimano, SRAM, and most other brands' narrow/wide chainrings (you must use a Prime 9 chain).

Each Box Three groupset includes the following components:

• Box Three Prime 9 Speed Twin Lever Shifter
• Box Three Prime 9 Speed Derailleur
• Box Three Prime 9 Speed Chain
• Box Three Prime 9 Speed Cassette

Rear derailleur Specifications:

• Number of gears: 9 speed
• Weight: 349g
• Materials: Constructed from both aluminium, glass fibre/nylon composite and steel with a matte black finish.
• Chain and cassette compatibility: Compatible with Prime 9 chains and cassettes.
• Max cassette range: 11-50t, or 11-46t depending on the option selected.
• Clutch style: Limited-slip clutch. Non-adjustable
• Cage length: Available in Wide (46t max), or X-Wide (50t max) cage lengths

Compatible with standard derailleur hangers only (not compatible with Direct-Mount hangers)

Shifter / Remote Specifications:

• Number of gears: 9 speed
• Trigger action: Single or multi-shift depending on the option selected.
• Weight: 135g
• Materials: Glass fibre, nylon composite, steel.
• Mount style: 22.2mm bar clamp (non-hinged).
• Shifter cable: Comes with a stainless steel shifter cable included.

Chain Specifications:

• Number of gears: 9 speed
• Compatible with 10,11, or 12-speed Shimano, SRAM, and most other brands' narrow/wide chainrings.
• Weight: 312g
• Materials/Construction: Hardened alloy steel. Solid pin construction.
• Quick joining link: Yes, a quick link comes included with the chain.
• Number of links: 126 links

Cassette Specifications:

• Number of gears: 9 speed
• Weight: 545g (11-46t), 660g (11-50t)
• Materials / construction: Stamped steel cogs with the largest ones pinned to a steel spider.
• Freehub mounting style: Shimano style HG only

Cog-tooth span:

• 11-46t: 11 - 13 - 15 - 18 - 22 - 28 - 34 - 40 - 46
• 11-50t: 11 - 13 - 15 - 18 - 22 - 28 - 34 - 42 - 50
• 12-46t: 12 - 14 - 16 - 18 - 22 - 28 - 34 - 40 - 46
• 12-50t: 12 - 14 - 16 - 18 - 22 - 28 - 34 - 42 - 50