Box Two-E 9S Prime 9 Drive-train Bundle

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Box Two-E 9S Drivetrain Bundle w/ Prime 9 Technology

Box developed the Box Two-E system as an e-bike specific drivetrain to offer more robust high wattage strength and a better riding experience. With Box 9 speeds and wide range gearing means less shifting action and more efficiency for the motor. With the 42 and 50 tooth low gears, it’s possible to maintain optimum pedaling cadence while climbing steep hills. By enabling riders a higher pedaling cadence, the electric assist also operates more efficiently and is able to climb without bogging down the motor.


  • E-Bike specific drivetrain designed to provide wide gear ratios with reduced shifting
  • 454% differential between gear 1 and gear 9
  • Easy to use Twin Lever Shifter actuation
  • Low maintenance derailleur
  • High durability cassette and chain


With the trend to 10, 11, 12 and now even 13 speed cassettes, the gears and chains are getting thinner and more fragile. With a mid-drive motor you need fewer gears but more strength in drive train components. This is something Box noticed and did something about. Depending on the mid-drive motor, you can be putting between two and over ten times the typical human power through the drive train. By taking a step back to 9 speeds, Box was able to beef up the drive-train to withstand these magnified ebike power levels.


Box Prime 9 Compatibility Guide

  • You need this!
  • Derailleur Specs
  • Cassette Specs
  • Shifter Specs
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If you are converting your bike to a mid-drive motor and want maximum drive-train durability, maximum gear range, and all of your shifts to be just right then this is the first thing you should consider after installing that powerful mid-drive motor.  At Electrify Bike Co., we are always looking for the Goldilocks zone, the sweet spot between weight, power, range, durability and price.  With a mid-drive motor, Box has given us a drive-train that is squarely in the "just right" goldilocks zone for eMTB drive-trains.  With electric assist you just don't need all of those gears!  So the smart thing to do is to trade off unneeded gears in an ultra wide-range cassette for beefier components and less shifting.  SRAM gave us the EX1 which is still the king of this category but it misses the "just right" on price.  Box has nailed it on price.

Although this is the perfect drive-train for electric mountain bikes it also can't be beat for street machines and hybrids.  What electric bike with a mid-drive can't benefit from a beefy drive-train and super wide gearing.  You probably gave up two of your front chainrings with your mid-drive conversion so now you not only have fewer gears but a much narrower range of gearing.  This ultra-wide range cassette gives it all back.

If you bought an eMTB with an 11 or 12 speed drive-train or converted an 11 or 12 speed MTB with a mid-drive kit, you either already have or certainly will wear out or break a key drive-train component.  You should seriously consider replacing your whole drive train with this.  This is the perfect drive-train for a mid-drive motor ebike and with its lifetime warranty, you will never need to buy another one. All new drivetrains from Box Components include a Lifetime Warranty Against Breakage.

Like I said, "You need this!"

Reviews:
https://www.emtbforums.com/box-e-bike-drivetrain-review/
​https://e-bikerumor.com/2019/01/23/box-two-e-9s-e-mtb-drivetrain-keeps-it-simple-in-favor-of-durability-and-reliability/
Box Two-E 9SP Derailleur
Tri-Pack limited slip clutch™ - an innovative chain damper that vastly reduces derailleur cage bounce and chain slap. The system also maintains tension for better chain wrap. At its core is a clutch pack, that is capable of providing a large amount of force in a small package.
Durable 3D Forged Linkages - Impact resistance is greatly improved by way of forging — a key manufacturing process that strengthens critical components. Tested at the premier freeride event of the season — Red Bull® Rampage — this new construction has proven itself capable of performing at the highest level.
Pivot-Tech - Impact resistant, spring-loaded cable stay keeps cable, housing & you out of harm’s way.
Speeds                             9 Speed
Materials                          6061-T6 Aluminum, Carbon Fiber/Nylon Composite
Pulleys                             Closed Bushings
Cage Size                        X-Wide
Maximum Cog                50T
Hardware                         Aluminum / Cr-Mo Alloy
Color/Finish                    Hard Onyx™
Weight                              290 grams / 10.2 ounces
Technology                      Tri-Pack™ Limited Slip Clutch, Pivot Tech™

Box Two-E 9SP 11-50 Cassette
​Extend your range, without emptying your wallet. Box Two™ Cassettes are a quick and easy upgrade for you electric mid-drive motor conversion. Ramped teeth and a gradual, linear progression help provide smoother transitions from gear to gear, while a massive 50 tooth cog extends range to a respectable 454 percent. Compatibility** with standard freehub bodies means this cassette is suitable for nearly any bike.
Cogs                                 11-13-15-18-22-28-34-42-50
Hub Compatibility           Shimano® HG
Speeds                              9 speed
Material                            Steel & 7075-T6 Aluminum
Weight                              650 grams (w/lock-ring)
Box Two-E 9SP Shifter
With improved ergonomics and thumb & index finger controls, Box Two™ Twin Lever Shifters provide smooth and accurate transitions from gear to gear. One gear per shift improves e-bike drivetrain durability.
Speeds                     9 Speed
Material                   Aluminum, Nylon Composite
Hardware                 Aluminum, Steel
Color/Finish            Matte Onyx
Weight                     122 grams / 4.3 ounces

All Box Two™ shifters include a stainless steel shift cable.