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Sram X9 9 Speed Rear Derailleur Review

   Words by Ben Mercer

   on 03/12/2010 10:30:00


Sitting below the elite XO model is the new SRAM X9 alloy and composite rear mech, at 239g for the long-cage model. The body is a tweaked 10-speed version of the 2009/10 9-speed X9.

It's chunky, solid and without a hint of flex or sloppiness anywhere - good portents for accurate shifting. Strong return springs in the arm and the parallelogram keep the chain tensioned over the rough stuff and ensure lightning fast rear shifting right across modern wide-ration 12-36T rear cassettes.

Setting up SRAM rear mechs is a breeze and once dialled in they're more tolerant of slight cable stretch and drop-damage hanger misalignment - meaning you can keep riding while your biking buddies are figuring out how to make their gears work. 

We've run this grey one (a red/white option is also available in short, medium and long cages) through some seriously yucky trail conditions, filled it with flay, bashed it on rocks and left it out in the rain. So far, so durable - shifting is still laser guided. Perfect. Try the X7 mech for £20 less for the same effect but a few extra grams.  Verdict: Solid, reliable 10-speed shifting but nearly £30 more than the XT.

Verdict: 3.5/5

Reviewer: What Mountain Bike


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