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Box One Prime 9 Rear Derailleur - boxcomponents
Box One Prime 9 Rear Derailleur - Box®
Box One Prime 9 Rear Derailleur - Box®
Box One Prime 9 Rear Derailleur - Box®
Box One Prime 9 Rear Derailleur - Box®
Box One Prime 9 Rear Derailleur - Box®
Box One Prime 9 Rear Derailleur - Box®
Box One Prime 9 Rear Derailleur - Box®
Box One Prime 9 Rear Derailleur - Box®
Box One Prime 9 Rear Derailleur - Box®

Box One Prime 9 X-Wide Rear Derailleur Black

Regular price
$184.99
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$184.99
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BX-DR1-P9AXWC-BK

DESCRIPTION

The Box One Prime 9 Rear Derailleur takes the advantages of our legacy 9-speed drive-train but adds the advancements of a modern 1 by; a fully adjustable Tri-Pack™ 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. 

FEATURES

  • Our Best Performing Derailleur
  • For Aggressive Terrain
  • Adjustable Tri-Pack™ Limited Slip Clutch
  • Precision Sealed Bearing Pulleys
  • Carbon-Nylon Composite Knuckle
  • Pivot-Tech™ Cable Stay
  • Durable 3D Forged Linkages
  • Forged Inner and Outer Cage
  • Compatible with Standard Derailleur Hangers (Non Direct-Mount)
  • Prime 9 Technology™

IMPORTANT NOTES

COMPATIBILITY

  • Box One Prime 9 11-50T and also 12-50T eBike Cassette Black
  • Box Two Prime 9 11-50T and also 12-50T eBike Cassette Black
  • Box Three Prime 9 11-50T and also 12-50T eBike Cassette Black
  • Box One Prime 9 Chain 126L DLC Black
  • Box Two Prime 9 126 Link Chain Nickel
  • Box Three Prime 9 126 Link Chain Polished
  • Box One Prime 9 Shifter Black
  • Box Two Prime 9 Shifter Black
  • Box Three Prime 9 Shifter Black

FAQ

Prime 9 Box One & Two Installation

 

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

No, traditional 9 speed systems use a Cable Pull that is not compatible with Prime 9.

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.

We suggest removing the derailleur from the bike and using a soft bristle brush or rag with soapy water or a mild de-greaser. We do not recommend pressure washing, strong solvents or de-greasers as they could degrade the surface coating.

Please see our installation video at https://boxcomponents.com/collections/support

 SPECIFICATIONS


Material Stainless Steel, Hardened Alloy Steel, Nylon Composite
Finish Hard Onyx
Weight 290g/10.2oz



Customer Reviews
4.0 Based on 3 Reviews
5 ★
33% 
1
4 ★
33% 
1
3 ★
33% 
1
2 ★
0% 
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1 ★
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Filter Reviews:
KG
01/04/2022
Kevin G.
United States

Box 1 Prime 9 Perfect

This thing will take a beating. Going on over a year with no issue

MS
10/02/2021
Mark S.
United States United States

So So

The Box One 9 speed derailleur and shifter is a bit sloppy, which makes too much noise for me. The sitting is also too clunky. It works fine, but I switched back to SRAM XO.

V
09/04/2021
Victor
United States United States

Pretty Good Option Over 11 Speed

I have been using the Box One derailleur for 5 months, two of which for racing. One issue I have noticed is that the derailleur goes out of adjustment quite often and the jockey wheels have a small bit of play in the bearings. Once, the clutch on the derailleur lost the chain tension and I took the clutch cover off and removed the derailleur cage screw and noticed it had a lack of Loctite. I resolved this issue by adding some Loctite and re-tightening the clutch to my desired cage tension. Besides those issues, the derailleur is holding up well and the cassette range (11-46) is very good. I am a XC racer running a 1x oval chain ring and a ten-speed chain with no problems. I recommend this to trail/enduro guys looking for simplicity in a drivetrain. I cannot completely recommend this to aggressive XC/XC racers or to anyone who shifts under load often. I have reviews for the Box Three shifter and deraillieur.