This groupset is available as a Single Shift option for electric mountain bikes (E-MTB) & a Multi Shift option for mountain bikes. Combining four trail-ready components from Box's Two & Three range, this model is simple to set up & means that you can upgrade your existing drivetrain for functional & intuitive shifting performance wherever your next adventure takes you. Did you know that you can mix & match Prime 9? Can't decide between the modern basics of Box Three & the long service life of Box Two? Well, you don't need to! With this pre-configured & pre-tested option, you'll receive a Box Three cassette paired to the durable Box Two derailleur, shifter & chain. Box Three Prime 9 Cassette 11-50T The Box Three cassette draws from both of its Box One & Box Two siblings to create a sensible all-rounder. All cogs are stamped from steel. The main difference here versus Box Two is the use of additional weight-reducing holes on the cogs. This X-Wide version offers an 11-50T range.

Features:
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Material: Aluminium, Cold Rolled Steel
- Finish: ED Black
- Gear Ratio: 11-50T
- Gears: 11
- 13
- 15
- 18
- 22
- 28
- 34
- 42
- 50
- Box Component's Best All-Rounder Cassette
- Steel Stamped Cogs
- Ultra-Wide Ratio with Consistent Progression
- Prime 9 Technology
- Compatible with HG Freehub Bodies
- Weight: 660g Box Two Prime 9 Chain 126L The Box Two chain's nickel plating adds both corrosion & wear-resistance. All Prime 9 chains have chamfered shifting edges, solid plates & solid pins to safeguard durability. The unique inner link spacing is engineered to grab those modern wide/narrow chainrings. Box chose to modernise the 9-speed platform due to the chain's spirited reputation.

Features:
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Material: Hardened Alloy Steel
- Finish: Nickel
- Box Component's Most Durable Chain
- Nickel Plated Protection
- Durable Hardened Solid Pins
- Wide/ Narrow Chainring Compatible
- Compatible with most 10, 11, & 12-speed wide / narrow chain rings
- Prime 9 Technology
- Weight: 305g Box Two Prime 9 Shifter (Select Option) The Box Two shifter is the only shifter on the market (other than the Box One) that comes factory stock with a hinged clamp. Box Two is performance tier, so this shifter still maintains the durable cast aluminium top shell but trades out the Box One's 1-piece pull-lever for a 2-piece resin & steel variant. All Prime 9 shifters take advantage of the 9-speed's inherent durability, simplicity, & reliability. Not only is the shifter mechanism joyfully simplified, but fewer shifts are needed for every mile of travel. & the best part is? Prime 9 is also terribly forgiving so you won't have to constantly adjust your set-up. Available as a multi-shift option (pull several gears at once) or single-shift shifter option (a sound choice for e-bikes). Please select the option from the menu to suit your bike.

Features:
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Material: Glass Fibre / Nylon Composite, Steel, Aluminium Alloy
- Finish: Matte Onyx
- Hinged & Extruded Clamp
- 2 pc Pull Lever / Up to 3 Gears Per Shift* (Multi Shift Option)
- 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 nonadjustable Tri-Pack Clutch, bushing pulleys & some muted finishes. Box Two rear derailleurs are still optimised for 11-50t cassettes & offer durability & performance for the most demanding terrain, just at lower price.

Features:
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Material: Stainless Steel, Hardened Alloy Steel
- Finish: Matte Onyx
- Tri-Pack Limited Slip Clutch
- Sealed Bushings Pulleys
- Nylon Composite Knuckle
- Pivot-Tech Cable Stay
- Durable 3D Forged Linkages
- Forged Inner & Outer Cage
- Prime 9 Technology
- Compatible with Standard Derailleur Hangers (Non Direct-Mount)
- Weight: 290g Manufacturer's Part Numbers: BX2PR9GRP03 Black Single Shift BX2PR9GRP04 Black Multi Shift































































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The Box Four groupset is designed for riders who want less fuss. It features an 8 speed shifter & an 11-42T cassette, which offers a great range of gearing to meet the demands of your off-road adventures. Designed for smooth performance, its rear mech uses a Limited Slip clutch in a compact cage. A final highlight is its custom 8 speed chain that's built for abuse. This makes it a great groupset for riders that want strong groupset without all the frills & at a wallet-friendly price. Box Four 8 Speed Shifter The Box Four shifter's main features aren't strikingly different from Box Three's. The key difference is its 8-speed platform. We've chosen to modernize the 8-speed in much the same way we did the 9-speed for Prime 9. Just like the Prime 9, the Box Four shifters take advantage of the "less is more" theme & exploit durability, simplicity, & reliability.

Features:

Material: glass reinforced fiber / Nylon Composite, Steel Extruded Clamp 2 Piece Pull Lever / Up to 3 Gears Per Shift Resin Top Shell Fast Action Release Lever Not Intended for E-Bike Use Weight: 128g Box Four 8 Speed Wide Rear Derailleur Black The Box Four Rear Derailleur is the base of Prime 9 Technology that offers an affordable clutch based 1 by 8-speed derailleur that is simple & light; this makes it a perfect candidate for every entry-level bike that traditionally has a 3 by drive-train that is neither durable nor user friendly.

Features:

Material: Aluminum, glass reinforced fiber / Nylon Composite, Steel Limited Slip Clutch Bearing Pulleys Nylon Composite Knuckle Direct Channel Cable Stay Die-Cast Linkages Stamped Inner & Outer Cage Compatible with Standard Derailleur Hangers (Non Direct-Mount) Weight: 328g Box Four 8 Speed 11-42T Cassette The Box Four cassette adapts our Prime 9 philosophy of durability, simplicity, & reliability at a great price point. All cogs are stamped from steel, given our durable black coating & then the larger cogs are pinned to each other with spacers for easy installation.

Features: Material Cold Rolled Steel Steel Stamped Cogs No Spiders Wide Ratio & Consistent Progression ED Black Protection Compatible with HG Freehub Bodies Not Intended for E-Bike Use Weight: 473g Box Four 8 Speed 116 Link Chain Natural The Box Four chain employs an 8-speed platform in a similar strategy to the Prime 9 but at a great price point. The chain is polished & then chemically treated to achieve corrosion resistance. We engineered the inner link spacing to be a little tighter than other 8-speed chains & is optimized for use with our Box Four Wide/ Narrow Chainring.

Features:

Material: Hardened Alloy Steel Durable Hardened Solid Pins Wide/ Narrow 8 speed Specific Weight: 364 FAQ Derailleur Are Box Prime 9 derailleurs compatible with Shimano "direct mount" hangers? No, Shimano direct mount hangers are proprietary & are not compatible with Box derailleurs. Is the Box Four Prime 9 Derailleur compatible with other 8 speed components? No, traditional 8 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 Four Prime 9 derailleur? We suggest removing the derailleur from the bike & using a soft bristle brush or rag with soapy water or a mild degreaser. We do not recommend pressure washing, strong solvents or de-greasers as they could degrade the surface coating. Shifter Does the Box Four Shifter come with a cable? Yes. All Box One 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 & 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 Four Shifter compatible with other 8 speed derailleurs? No, traditional 8 speed systems use a Cable Pull that is not compatible with Box Four components. Cassette Will the Box Four Prime 9 Cassette fit on a 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 Four Prime 9 Cassette compatible with other 8 speed drivetrains? No, The Box Four Prime 9 Cassette is optimized for use only with Box Four Prime 9 Components; running other component variations could result in poor performance. How should I clean my Four Prime 9 Cassette? We suggest removing the cassette from the wheel & using a soft bristle brush with soapy water or a mild degreaser. We do not recommend pressure washing, strong solvents or degreasers as they could degrade the surface coating.













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This high-quality chainring features a hard-wearing steel construction, which allows it to withstand all of the speed & torque that's associated with long days on the trails. Box has also put this model through a forging process for extra durability & a CNC-machining process to remove any excess material while still maintaining strength. Coming complete with an ED Black Protection coating, it provides additional protection against corrosion when exploring the mountains in all-weather conditions. The Box Four Wide/ Narrow chainring completes the package for the 1x 8 system. It is the first 8 speed specific chainring designed to optimise chain retention when using 8 speed chains. The tooth profile & thicknesses are tailored to match the inside geometry of the unique Box Four chain. ...

This Box Four chain employs an 8 speed platform in a similar strategy to the Prime 9 model but at a great value price point. ...

Heat-treated for added strength & durability, this 11-Speed & Box 7 DH compatible chain gives smooth shifting & movement from its durable, alloy steel construction. Each of the 116 links is finished with a Titanium Aluminum-Nitride coating for further dependability & efficiency on long days going up & down the mountain. ...

Easier to adjust, greater efficiency & smoother driving are all key factors provided by this superb model which makes life ...

This stunning groupset focuses on the ride & not just the clicks. It's easy to use thanks to its twin lever shifter actuation ...

This stunning groupset focuses on the ride & not just the clicks. It's easy to use thanks to its twin lever shifter actuation ...

This superb model is specifically designed for MTB use, so can enjoy fast & precise shifting all across the mountain. in addition, ...

Made from cold forged & CNC-machined 6061-T6 aluminium, this aesthetically awesome clamp is equipped with titanium hardware & laser-etched graphics to add a bit of colour & customisation to your seatpost. ...