Ready for fast and fun MTB adventures, the Box Two Prime 9 Speed Groupset offers super-smooth gearing and consistent operation on your mountain bike.

The Box Two groupset delivers similar performance to the top-tier Box One without the costly features. You still get the Tri-Pack (TM) Clutch in the rear mech only it isn’t adjustable. The cassette’s 11-50T range is equally impressive and the action on the shifter is just as snappy although you don’t get the rigid die-cast pull lever. Completing this groupset is its high-quality chain, which boasts impressive torque power and speed as you explore the trails on your mountain bike.

Box Two Prime 9 Shifter

The Box Two shifter is the only shifter on the market (other than our Box One) that comes factory stock with a hinged clamp. Box Two is our performance tier so this shifter still maintains the durable cast aluminum top shell but trades out the Box One’s 1-piece pull-lever for a 2-piece resin and steel variant. All Prime 9 shifters take advantage of the 9-speed’s inherent durability, simplicity, and reliability. Not only is the shifter mechanism joyfully simplified, but fewer shifts are needed for every mile of travel. And the best part is? Prime 9 is also terribly forgiving so you won’t have to constantly adjust your set-up.

Features:

Material: Glass Fibre / Nylon Composite, Steel, Aluminum Alloy with Matte Onyx finish

Hinged and Extruded Clamp

2 pc Pull Lever / Up to 3 Gears Per Shift* ( two options available to select)

Die Cast Top Shell

Fast Action Release Lever

Prime 9 Technology

Multi Shift Option Not Intended for E-Bike Use

Single Shift Option Recommended for E-Bike Use

Weight 135g

Box Two Prime 9 X-Wide Rear Derailleur

The Box Two Prime 9 Rear Derailleur is very similar to the Box One version however, to be more wallet-friendly, it offers a non-adjustable Tri-Pack™ Clutch, bushing pulleys, and some muted finishes. Box Two rear derailleurs are still optimized for 11-50t cassettes and offer durability and performance for the most demanding terrain, just at a lower price!

Features:

Material: Stainless Steel, Hardened Alloy Steel with Matte Onyx finish

Tri-Pack Limited Slip Clutch

Sealed Bushings Pulleys

Nylon Composite Knuckle

Pivot-Tech Cable Stay

Durable 3D Forged Linkages

Forged Inner and Outer Cage

Prime 9 Technology

Compatible with Standard Derailleur Hangers (Non Direct-Mount)

Weight: 290g

Box Two Prime 9 11-50T Cassette

The Box Two cassette was where Prime 9 started. Originally conceived as an E-MTB product to deliver long service life and extra range over fewer gears, we quickly grew to enjoy its abilities on unpowered MTBs. All cogs are stamped from steel and subsequently, the larger ones are pinned to alloy spiders. Due to its provenance, this is, without doubt, the most durable cassette in the range.

Features:

Material: Hardened Alloy Steel, Aluminium

Cogs Pinned to Lightweight Spiders

Ultra-Wide Ratio with Consistent Progression

Prime 9 Technology

Our Most Durable Cassette

Compatible with HG Freehub Bodies

Not Intended for E-Bike Use

Weight: 645g

Box Two Prime 9 126 Link Chain Nickel

The Box Two chain’s nickel plating adds both corrosion and wear-resistance. All Prime 9 chains have chamfered shifting edges, solid plates and solid pins to safeguard durability. Our unique inner link spacing is engineered to grab those modern wide/narrow chainrings. We chose to modernize the 9-speed platform due to the chain’s spirited reputation.

Features:

Material: Hardened Alloy Steel with Nickel finish

Our Most Durable Chain

Nickel Plated Protection

Durable Hardened Solid Pins

Wide/Narrow Chainring Compatible

Prime 9 Technology

Weight: 350g

FAQ

SHIFTER

Does the Box Two Prime 9 Shifter come with a cable?
Yes. All Box Two Twin Lever Shifters come with a stainless steel shift cable.

How do I remove the cap from the cable port to install a new cable?
To remove it, use a Phillips head screwdriver and turn it counter-clockwise a quarter turn You can then push the cap out by applying pressure to the cable from the other side. Please Note: The Cable Port is not a screw that un-threads from the cable port, if you turn the cable port screw more than 90 degrees damage may occur.

Is the Box Two Prime 9 Shifter compatible with other 9 speed derailleurs?
No, traditional 9 speed systems use a Cable Pull that is not compatible with prime 9.

DERAILLEUR

Are Box Prime 9 derailleurs compatible with Shimano “direct mount” hangers?

No, Shimano direct mount hangers are proprietary and are not compatible with Box derailleurs.

Is the Box Two Prime 9 Derailleur compatible with other 9 speed components?
No, traditional 9 speed systems use a Cable Pull that is not compatible with Prime 9.

Are Box Prime 9 derailleurs compatible with drop bar (road) shifters?
No, Box Prime 9 derailleurs are not currently compatible with drop bar shifters, but we do offer a clamp for our shifters to mount on some 31.8mm drop handle bars.

How should I clean my Box Two Prime 9 derailleur?
We suggest removing the derailleur from the bike and using a soft bristle brush or rag with soapy water or a mild de-greaser. We do not recommend pressure washing, strong solvents or de-greasers as they could degrade the surface coating.

CASSETTE

Will the Box Two Prime 9 Cassette fit on an wheel with a Sram XD Driver?

No this will only work with a HG splined Shimano 9-10-11 speed freehub body.

Is the Box Two Prime 9 Cassette compatible with other 9 speed drivetrains?
No, The Box Two Prime 9 Cassette is optimized for Box Prime 9 drivetrains and running other component variations can result in poor performance.

How should I clean my Box Two Prime 9 Cassette?
We suggest removing the cassette from the wheel and using a soft bristle brush with soapy water or a mild de-greaser. We do not recommend pressure washing, strong solvents or de-greasers as they could degrade the surface coating.

CHAIN

Is the Box Two Prime 9 Chain compatible with other 9 speed drivetrains?

Yes, All Box prime 9 chains have standard external geometry that will work with most existing 9 speed drivetrains.

Is the Box Two Prime 9 Chain Compatible with any wide narrow chainring?
No, Box Prime 9 chains are compatible with most 11-speed wide narrow chainrings but there are some chainrings that can result in poor performance. We recommend the following 11 speed wide/narrow chainrings for best performance, Wolftooth Components, Raceface, One Up Components, Absolute Black.

How should I clean my Box Two Prime 9 Chain?
We suggest removing the chain from the bike and using a soft bristle brush or rag with soapy water or a mild de-greaser. We do not recommend pressure washing, strong solvents or de-greasers as they could degrade the surface coating.