Box One-E 9S Derailleur

$157.99 Sale Save
Size X-Wide Cage
Color Black

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Adjustable Tri-Pack Limited Slip Clutch™

The Adjustable Tri-Pack limited slip clutch™ is 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. Clutch force can be adjusted to give the user the ability to tune their setup to the desired balance of shifter feel and chain retention. This version is also serviceable.

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.


Impact resistant, spring-loaded cable stay keeps cable, housing & you out of harm’s way.


How is the Ebike variant different?

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

Standard Mount vs. Direct Mount Derailleur Hangers

View & download instructions here: PDF File

View & download instructions here: PDF File

Q: Can I install this on my bike that uses a b-link for my current derailleur?
A: Yes! All you need to do is remove your old derailleur and the b-link leaving the standard hanger attached to your bike frame. You can now mount your Box Components derailleur directly to the hanger on your frame.

Q: Can I install this on my bike that currently has a direct mount hanger?
A: Possibly, you will need to see if your frame manufacturer or a third party like wheelsMFG offers a standard mount hanger for your frame. 

Speeds 9 Speed
Materials 6061-T6 Aluminum, Carbon fiber/Nylon Composite
Shifter Compatibility Box One™ or Box Two™ 9S-E
Pulleys Precision Sealed Bearing
Minimum Cog 11 teeth
Maximum Cog 50 teeth
Color/Finish Hard Onyx™
Inner & Outer Cage Forged
Weight 288 grams / 10.2 ounces
Technology Adjustable Tri-Pack™ Limited Slip Clutch, 3D Forged Linkages, Pivot Tech™