—$214.99

If you're in the market for a new drivetrain the Box Prime 9 groupset is a great option! Many of the Big Box (pun intended) brands have a lot of options and it makes it hard to choose what's right for you. This drivetrain is not so hard on the wallet and is meant to take all the abuse you can throw at it. The great thing about this drivetrain is you don't get overly heavy parts because it's only got what you need. The 9 speed cassette is really what helps this bring the weight down. This isn't your typical old school 9 speed though. You get a seriously good gear range with just the right spacing and not too much in between. You can't go wrong with the Prime 9 because it's backed by Box's Shift Happens warranty program that really stands behind the product.Box's Prime 9 Technology is a counter-intuitive philosophy based on the less is more theory. It embraces range without adding complexity. The outcome is fewer parts, reduced weight, and increased durability. The x-wide rear derailleur features a limited slip clutch, which engages instantly with constant torque for less chain slap, better chain engagement and no dropped chains The 11-50t cassette offers ultra-wide ratio with consistent progressions Prime 9 technology offers the same range as a 12-speed drivetrain, with fewer gears to shift through Fewer parts, reduced weight, and increased durability Prime 9 drivetrains significantly reduce the chain angle in the lowest gears, allowing the chain to run straighter across all gears, increasing the life of the chain and cassette The 2-piece multi-shift pull lever allows for riders to move up to 3 gears per shift The Prime 9 chain is compatible with modern narrow/wide chainrings, and resists stretching over time, and decreases wear on the cassette and chainring Item Specifications Cassette Cogs 11-13-16-20-24-30-36-42-50 Weight 1354g BOX Three Prime 9 Groupset Kit-In-A-Box Mtn Group UPC: 639266097488

by BOX

—$81.99

The Box Three Prime 9 cassette is a great all-around cassette option. All cogs are stamped from steel and subsequently, the larger ones are pinned to alloy spiders. It also features weight-reducing holes on the cogs. The Box Three Prime 9 offers ultra-wide ratio with consistent progressions Prime 9 technology offers the same range as a 12-speed drivetrain, with fewer gears to shift through Fewer parts, reduced weight, and increased durability Cogs pinned to lightweight spiders Constructed using a standard freehub body (HG) Item Specifications Cassette Body Type Shimano/SRAM 8, 9, 10 Speed Cassette Cogs 11-13-15-18-22-28-34-42-50 Color ED Black Defined Color Black Designed for ebike Yes Drivetrain Speeds 9 Range 11-50 Weight 550 BOX Three Prime 9 Cassette 9-Speed Cassettes UPC: 639266097341

by BOX

—$83.99

The Box Three Prime 9 Rear Derailleur is a simple, but fully-featured and wallet-friendly rear derailleur. It includes a limited slip clutch, sealed bearing pulleys and a solid construction. It is compatible with 11-46 and 11-50t cassettes making it one of the most versatile derailleur offerings for Prime 9 drivetrains. Prime 9 technology offers the same range as a 12-speed drivetrain, with fewer gears to shift through The limited slip clutch engages instantly and offers constant torque for less chain slap, better chain engagement and no dropped chains Stamped front and rear cage Direct channel cable stay Bearing pulleys Item Specifications Cage Length Long Chain Wrap Capacity (teeth) 39 Color Matte Black Designed for ebike Yes Drivetrain Speeds 9 Largest Cog 50 Rear Der/Shifter Compatibility BOX Prime 9 Rear Derailleur Mount Type 10x1 Standard Weight 349 BOX Three Prime 9 Rear Derailleur Rear Derailleur UPC: 639266097334

by BOX

—$166.99

The BOX Four tier is the perfect choice for riders who just want less fuss! You're fond of Prime 9, but know 8 is enough, and surely 11-42T is plenty of range for an 8-speed cassette. The derailleur still has the Limited Slip clutch and now arrives with a more compact cage. The 8-speed chain is built for abuse, although it's sophisticated enough to have its own wide/narrow chainring. Push through fewer gears with a no-nonsense shifter. Multi shift shifter pulls up to 3 gears per shift Multi shift shifter is not intended for use with eBikes Engineered with BOX's "8 is Enough" drivetrain philosophy 8-speed 11-42 tooth cassette is compatible with HG freehub bodies Rear derailleur with Limited Slip clutch is compatible with standard derailleur hangers (non-direct mount) 8-speed chain is compatible with wide/narrow chainrings Item Specifications Cassette Cogs 11-13-15-18-22-28-34-42 BOX Four 8-Speed Groupset Kit-In-A-Box Mtn Group UPC: 639266097433

by BOX

—$209.99

Box's Prime 9 Technology is a counter-intuitive philosophy based on the less is more theory. It embraces range without adding complexity. The outcome is fewer parts, reduced weight, and increased durability. The wide rear derailleur features a limited slip clutch, which engages instantly with constant torque for less chain slap, better chain engagement and no dropped chains The 11-46t cassette offers ultra-wide ratio with consistent progressions Prime 9 technology offers the same range as a 12-speed drivetrain, with fewer gears to shift through Fewer parts, reduced weight, and increased durability Prime 9 drivetrains significantly reduce the chain angle in the lowest gears, allowing the chain to run straighter across all gears, increasing the life of the chain and cassette The 2-piece multi-shift pull lever allows for riders to move up to 3 gears per shift The Prime 9 chain is compatible with modern narrow/wide chainrings, and resists stretching over time, and decreases wear on the cassette and chainring Item Specifications Cassette Cogs 11-13-16-20-24-28-34-40-46 Weight 1308 BOX Three Prime 9 Groupset Kit-In-A-Box Mtn Group UPC: 639266097471

by BOX

—$166.99

The BOX Four tier is the perfect choice for riders who just want less fuss! You're fond of Prime 9, but know 8 is enough, and surely 11-42T is plenty of range for an 8-speed cassette. The derailleur still has the Limited Slip clutch and now arrives with a more compact cage. The 8-speed chain is built for abuse, although it's sophisticated enough to have its own wide/narrow chainring. Push through fewer gears with a no-nonsense shifter. Single shift option is recommended for eBike use Engineered with BOX's "8 is Enough" drivetrain philosophy 8-speed 11-42 tooth cassette is compatible with HG freehub bodies Rear derailleur with Limited Slip clutch is compatible with standard derailleur hangers (non-direct mount) 8-speed chain is compatible with wide/narrow chainrings Item Specifications Cassette Cogs 12-14-16-18-22-28-34-42 BOX Four 8-Speed Groupset Kit-In-A-Box Mtn Group UPC: 616043832326

by BOX

—$309.99

The BOX Two Prime 9 Groupset delivers exceptional 9-speed performance, but in a simpler and more cost-effective package than BOX One. This kit includes a rear derailleur with a Tri-Pack Clutch, an 11-50 tooth cassette, shifter with snappy action, and a durable 9-speed chain. Multi shift shifter pulls up to 3 gears per shift Multi shift shifter is not intended for use with eBikes BOX's most durable drivetrain Prime 9 rear derailleur features a Tri-Pack clutch (non-adjustable) Derailleur is compatible with standard derailleur hangers (non-direct mount) Cassette is compatible with HG freehub bodies Compatible with most 10,11, and 12-speed wide/narrow chainrings Item Specifications Cassette Cogs 11-13-15-18-22-28-34-42-50 BOX Two Prime 9 Groupset Kit-In-A-Box Mtn Group UPC: 639266097464

by BOX

—$141.99

The Box Two Prime 9 Rear Derailleur is wallet-friendly and offers a non-adjustable Tri-Pack Clutch, bushing pulleys, and muted finishes. The derailleur is optimized for 11-50t cassettes, and offers durability and performance for the most demanding terrain. Prime 9 technology offers the same range as a 12-speed drivetrain, with fewer gears to shift through Forged inner and outer cage Closed bushing pulleys Durable 3-D forged linkages Pivot-Tech Cable Stay The limited slip clutch engages instantly with constant torque for less chain slap, better chain engagement and no dropped chains Limited slip clutch is also fully serviceable and a fully adjustable Meets durability requirements for E-MTB applications Item Specifications Cage Length Long Chain Wrap Capacity (teeth) 39 Color Matte Onyx Designed for ebike Yes Drivetrain Speeds 9 Largest Cog 50 Rear Der/Shifter Compatibility BOX Prime 9 Rear Derailleur Mount Type 10x1 Standard Weight 290 BOX Two Prime 9 Rear Derailleur Rear Derailleur UPC: 639266097273

by BOX

—$47.99

The Box Three shifter combines performance and value at an affordable price point. It makes good use of nylon composites in both top and bottom shells as well as the levers. Not only is the shifter mechanism joyfully simplified, but fewer shifts are needed for every mile of travel. Prime 9 is also terribly forgiving so you won't have to constantly adjust your set-up. Multi-shift lever allows you to pull several gears at once (up to 3 per shift) Prime 9 technology offers the same range as a 12-speed drivetrain, with fewer gears to shift through Features a resin top shell and extruded clamp Fast action lever Item Specifications Color Matte Black Drivetrain Speeds 9 Rear Der/Shifter Compatibility BOX Prime 9 Shifter Style Thumb Weight 128 BOX Three Prime 9 Shifter Shifter, Flat Bar-Right UPC: 639266097327

by BOX

—$62.99

The Box Two shifter offers exceptional performance with high-quality componentry. It features a hinged clamp made of extruded resin and steel, with a durable die cast aluminum top shell. Not only is the shifter mechanism joyfully simplified, but fewer shifts are needed for every mile of travel. Prime 9 is also terribly forgiving so you won't have to constantly adjust your set-up. Multi-shift lever allows you to pull several gears at once (up to 3 per shift) Prime 9 technology offers the same range as a 12-speed drivetrain, with fewer gears to shift through Die cast top shell Hinged and extruded clamp Fast action lever Item Specifications Color Matte Onyx Drivetrain Speeds 9 Rear Der/Shifter Compatibility BOX Prime 9 Shifter Style Thumb Weight 135 BOX Two Prime 9 Shifter Shifter, Flat Bar-Right UPC: 639266097266

by BOX

—$68.99

The BOX Four Rear Derailleur is an affordable clutch-based 1x8-speed derailleur that is both simple and lightweight. Engineered with BOX's "8 is Enough" drivetrain philosophy Limited Slip Clutch Bearing pulleys Nylon composite knuckle Direct channel cable stay Die-cast linkages Stamped inner and outer cage Compatible with standard derailleur hanges (non-direct mount) Item Specifications Cage Length Medium Chain Wrap Capacity (teeth) 31 Color Black Designed for ebike Yes Drivetrain Speeds 8 Largest Cog 42 Rear Der/Shifter Compatibility BOX 8-Speed Rear Derailleur Mount Type 10x1 Standard BOX Four 8-Speed Rear Derailleur Rear Derailleur UPC: 639266097402

by BOX

—$16.99

The BOX Four chain employs an 8-speed platform. The chain is polished and then chemically treated to achieve corrosion resistance. Inner link spacing is engineered to be a little tighter than other 8-speed chains and is optimized for use with the BOX Four wide/narrow chainring. Durable hardened solid pins Wide/narrow 8-speed specific Item Specifications Color Natural Defined Color Gray Designed for ebike Yes Drivetrain Speeds 8 Half Link Chain No Links (links) 116 BOX Four 8-Speed Chain Chains UPC: 639266097426

by BOX

—$54.99

The BOX One Prime 9 Chain is protected by a dual-coating of nickel plating and a "Diamond-Like Carbon" layer for added hardness, wear-resistance, and slickness. Prime 9 chains feature chamfered shifting edges, solid plates, and solid pins to safeguard durability. Inner link spacing is engineeered to grab modern wide/narrow chainrings. Durable dual-coating DLC ("diamond-like carbon") and nickel protection Hardened alloy steel Durable hardened solid pins Wide/narrow chainring compatible Compatible with most 10,11,12-speed wide/narrow chainrings Prime 9 technology Item Specifications Color DLC Black Defined Color Black Designed for ebike Yes Drivetrain Speeds 9 Half Link Chain No Links (links) 126 BOX One Prime 9 Chain Chains UPC: 639266097518

by BOX

—$47.99

The Box Three shifter combines performance and value at an affordable price point. It makes good use of nylon composites in both top and bottom shells as well as the levers. Not only is the shifter mechanism joyfully simplified, but fewer shifts are needed for every mile of travel. Prime 9 is also terribly forgiving so you won't have to constantly adjust your set-up. Single-shift lever is a sound choice for e-bikes Prime 9 technology offers the same range as a 12-speed drivetrain, with fewer gears to shift through Features a resin top shell and extruded clamp Fast action lever Item Specifications Color Matte Black Designed for ebike Yes Drivetrain Speeds 9 Rear Der/Shifter Compatibility BOX Prime 9 Shifter Style Thumb Weight 128 BOX Three Prime 9 Shifter Shifter, Flat Bar-Right UPC: 639266097310

by BOX

—$54.99

The BOX Four cassette adapts our Prime 9 philosophy of durability, simplicity, and reliability at a great price point. All cogs are stamped from steel, given our durable black coating and then the larger cogs are pinned to each other with spacers for easy installation. Compatible with HG freehub bodies Steel stamped cogs No spiders Wide ratio and consistent progression ED black protection Item Specifications Cassette Body Type Shimano/SRAM 8, 9, 10 Speed Cassette Cogs 11-13-15-18-22-28-34-42 Color Black Defined Color Black Drivetrain Speeds 8 Range 11-42 BOX Four 8-Speed Cassette Cassettes UPC: 639266097419

by BOX

—$22.99

The BOX Three Prime 9 Chain is polished and then chemically treated to achieve corrosion resistance. All Prime 9 chains have chamfered shifting edges, solid plates and solid pins to safeguard durability. A unique inner link spacing is engineered to grab modern wide/narrow chainrings. Durable hardened solid pins Wide/narrow chainring compatible Compatible with most 10,11, and 12-speed wide/narrow chainrings Item Specifications Color Polished Defined Color Silver Designed for ebike Yes Drivetrain Speeds 9 Half Link Chain No Links (links) 126 BOX Three Prime 9 Chain Chains UPC: 639266097365

by BOX

—$81.99

BOX's top of the line 9-speed shifter comes packed with features such as a hinged clamp and a durable cast aluminum pull lever and top shell. 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. Available as a multi-shift (pull several gears at once) or single-shift shifter (a sound choice for e-bikes). Multi shift shifter pulls up to 3 gears per shift Multi shift shifter is not intended for use with eBikes Engineered with Prime 9 drivetrain technology Lightweight hinged and machined clamp 1-piece pull lever Fast action release lever Die cast top shell Item Specifications Color Black Drivetrain Speeds 9 Rear Der/Shifter Compatibility BOX Prime 9 Shifter Style Trigger BOX One Prime 9 Shifter Shifter, Flat Bar-Right UPC: 639266097211

by BOX

—$62.99

The Box Two shifter offers exceptional performance with high-quality componentry. It features a hinged clamp made of extruded resin and steel, with a durable die cast aluminum top shell. Not only is the shifter mechanism joyfully simplified, but fewer shifts are needed for every mile of travel. Prime 9 is also terribly forgiving so you won't have to constantly adjust your set-up. Single-shift lever is a sound choice for e-bikes Prime 9 technology offers the same range as a 12-speed drivetrain, with fewer gears to shift through Die cast top shell Hinged and extruded clamp Fast action lever Item Specifications Color Matte Onyx Designed for ebike Yes Drivetrain Speeds 9 Rear Der/Shifter Compatibility BOX Prime 9 Shifter Style Thumb Weight 135 BOX Two Prime 9 Shifter Shifter, Flat Bar-Right UPC: 639266097259

by BOX

—$81.99

BOX's top of the line 9-speed shifter comes packed with features such as a hinged clamp and a durable cast aluminum pull lever and top shell. 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. Available as a multi-shift (pull several gears at once) or single-shift shifter (a sound choice for e-bikes). Single shift option is recommended for eBike use Engineered with Prime 9 drivetrain technology Lightweight hinged and machined clamp 1-piece pull lever Fast action release lever Die cast top shell Item Specifications Color Black Designed for ebike Yes Drivetrain Speeds 9 Rear Der/Shifter Compatibility BOX Prime 9 Shifter Style Trigger BOX One Prime 9 Shifter Shifter, Flat Bar-Right UPC: 639266097204

by BOX

—$109.99

The BOX Two Prime 9 Cassette delivers long service life and extra range. All cogs are stamped from steel and the larger ones are pinned to alloy spiders. Cogs pinned to lightweight spiders Ultra-wide ratio with consistent progression Prime 9 technology Compatible with HG freehub bodies Item Specifications Cassette Body Type Shimano/SRAM 8, 9, 10 Speed Cassette Cogs 11-13-15-18-22-28-34-42-50 Color Black Defined Color Black Drivetrain Speeds 9 Range 11-50 BOX Two Prime 9 Cassette Cassettes UPC: 639266097280

by BOX

—$109.99

The BOX Two Prime 9 Cassette delivers long service life and extra range. All cogs are stamped from steel and the larger ones are pinned to alloy spiders. Rated for eBike use Cogs pinned to lightweight spiders Ultra-wide ratio with consistent progression Prime 9 technology Compatible with HG freehub bodies Item Specifications Cassette Body Type Shimano/SRAM 8, 9, 10 Speed Cassette Cogs 12-14-16-18-22-28-34-42-50 Color Black Defined Color Black Designed for ebike Yes Drivetrain Speeds 9 Range 12-50 BOX Two Prime 9 Cassette Cassettes UPC: 616043832845

by BOX

—$214.99

Box's Prime 9 Technology is a counter-intuitive philosophy based on the less is more theory. It embraces range without adding complexity. The outcome is fewer parts, reduced weight, and increased durability. Single shift option is recommended for eBike use Prime 9 technology offers the same range as a 12-speed drivetrain, with fewer gears to shift through Fewer parts, reduced weight, and increased durability Prime 9 drivetrains significantly reduce the chain angle in the lowest gears, allowing the chain to run straighter across all gears, increasing the life of the chain and cassette The 2-piece multi-shift pull lever allows for riders to move up to 3 gears per shift The Prime 9 chain is compatible with modern narrow/wide chainrings, and resists stretching over time, and decreases wear on the cassette and chainring Item Specifications Cassette Cogs 11-13-15-18-22-28-34-42-50 BOX Three Prime 9 Groupset Kit-In-A-Box Mtn Group UPC: 639266097389

by BOX

—$194.99

The Box One Prime 9 Rear Derailleur takes the advantage of BOX's legacy 9-speed drivetrain but adds the advancements of a modern 1x; a fully adjustable Tri-Pack(TM) Clutch, and an x-wide cage optimized for an 11-50T cassette. Forged construction steps up the durability and performance to an unparalleled level. Suited for the most demanding terrain. Designed for aggressive terrain Adjustable Tri-Pack Limited Slip clutch Precision sealed bearing pulleys Carbon-nylong composite knuckle Pivot-Tech cable stay Durable 3D forged linkages Forged inner and outer cage Compatible with standard derailleur hangers (non-direct mount) Item Specifications Cage Length Long Chain Wrap Capacity (teeth) 39 Color Black Designed for ebike Yes Drivetrain Speeds 9 Largest Cog 50 Rear Der/Shifter Compatibility BOX Prime 9 Rear Derailleur Mount Type 10x1 Standard BOX One Prime 9 Rear Derailleur Rear Derailleur UPC: 639266097228

by BOX

—$35.99

The BOX Four 8-Speed Shifter takes advantage of the "less is more" drivetrain philosophy and exploits durability, simplicity, and reliability. Multi shift shifter pulls up to 3 gears per shift Multi shift shifter is not intended for use with eBikes Engineered with BOX's "8 is Enough" drivetrain philosophy Extruded clamp 2-piece pull lever Resin top shell Fast action release lever Item Specifications Color Black Drivetrain Speeds 8 Rear Der/Shifter Compatibility BOX 8-Speed Shifter Style Trigger BOX Four 8-Speed Shifter Shifter, Flat Bar-Right UPC: 639266097396

by BOX

—$76.99

The Box Three Prime 9 cassette is a great all-around cassette option. All cogs are stamped from steel and subsequently, the larger ones are pinned to alloy spiders. It also features weight-reducing holes on the cogs. Rated for eBike use The Box Three Prime 9 offers ultra-wide ratio with consistent progressions Prime 9 technology offers the same range as a 12-speed drivetrain, with fewer gears to shift through Fewer parts, reduced weight, and increased durability Cogs pinned to lightweight spiders Constructed using a standard freehub body (HG) Item Specifications Cassette Body Type Shimano/SRAM 8, 9, 10 Speed Cassette Cogs 12-14-16-18-22-28-34-40-46 Color Black Defined Color Black Designed for ebike Yes Drivetrain Speeds 9 Range 12-46 BOX Three Prime 9 Cassette 9-Speed Cassettes UPC: 616043832869

by BOX

—$309.99

The BOX Two Prime 9 Groupset delivers exceptional 9-speed performance, but in a simpler and more cost-effective package than BOX One. This kit includes a rear derailleur with a Tri-Pack Clutch, an 11-50 tooth cassette, shifter with snappy action, and a durable 9-speed chain. Single shift option is recommended for eBike use BOX's most durable drivetrain Prime 9 rear derailleur features a Tri-Pack clutch (non-adjustable) Derailleur is compatible with standard derailleur hangers (non-direct mount) Cassette is compatible with HG freehub bodies Compatible with most 10,11, and 12-speed wide/narrow chainrings Item Specifications Cassette Cogs 11-13-15-18-22-28-34-42-50 BOX Two Prime 9 Groupset Kit-In-A-Box Mtn Group UPC: 639266097303

by BOX

—$35.99

The BOX Four 8-Speed Shifter takes advantage of the "less is more" drivetrain philosophy and exploits durability, simplicity, and reliability. Single shift option is recommended for eBike use Engineered with BOX's "8 is Enough" drivetrain philosophy Extruded clamp 2-piece pull lever Resin top shell Fast action release lever Item Specifications Color Black Designed for ebike Yes Drivetrain Speeds 8 Rear Der/Shifter Compatibility BOX 8-Speed Shifter Style Trigger BOX Four 8-Speed Shifter Shifter, Flat Bar-Right UPC: 616043832258

by BOX

—$81.99

The Box Three Prime 9 cassette is a great all-around cassette option. All cogs are stamped from steel and subsequently, the larger ones are pinned to alloy spiders. It also features weight-reducing holes on the cogs. Rated for eBike use The Box Three Prime 9 offers ultra-wide ratio with consistent progressions Prime 9 technology offers the same range as a 12-speed drivetrain, with fewer gears to shift through Fewer parts, reduced weight, and increased durability Cogs pinned to lightweight spiders Constructed using a standard freehub body (HG) Item Specifications Cassette Body Type Shimano/SRAM 8, 9, 10 Speed Cassette Cogs 12-14-16-18-22-28-34-42-50 Color Black Defined Color Black Designed for ebike Yes Drivetrain Speeds 9 Range 12-50 BOX Three Prime 9 Cassette 9-Speed Cassettes UPC: 616043832852

by BOX