Two Prime 9 Derailleur(9spd), X-Wide Cage – Black



The Box Two Prime 9 Rear Derailleur is very similar to the Box One version; but 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 lower price!

2 in stock


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)

Material Stainless Steel, Hardened Alloy Steel
Finish Matte Onyx
Weight 290g/10.2 oz
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 Box offers a clamp for their shifters to mount on some 31.8 mm drop handle bars.

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Additional information


Box Two


Components, drivetrain






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