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Bike Repair: SRAM X.9 Rear Derailleur

June 6, 2009 Mountain Biking No Comments

Last week, while riding in Del Cerro Park, I bent my rear derailleur, which also broke my bicycle chain. I really don’t know how I did it. My best guess is that an errant rock mustve came into my path, since the derailleur was also rotated (in a not-so good way) on the derailleur hanger.

The damages came to light when I got to the bottom of the mountain. What is kind of funny is that I parked my car at the top of the mountain. The ride down was a glorious and speedy 20-minutes. The walk back up (in hard-soled bicycle shoes, no less) was a pretty grueling hour and half.

Anyways, it was a good opportunity to upgrade another bike component. Still getting used to my bike (I know, not yet a month-old and I broke it =T), I opted to just go one level up, from X.7 to X.9. Other than the finish, the only real difference seems to be weight. The X.9s are 30 grams lighter.

Here is the actual damage. BENT parallelogram. This, technically, could be straightened, but the time/effort involved would’ve cost more than simply replacing/upgrading it.

Action shot: already attached to the derailleur hanger, used my multi-tool (Topeak Alien II) to screw the unit to the frame.

Stock photo of the part. Pretty, aint it?

Copy + Paste from SRAM’s website:

Rear Derailleur

  • Stylish and Strong! A forged 6061 aluminum B-Knuckle improves stiffness while the X.9 styling exudes our commitment to quality. X.9 is now available in three cage sizes.
  • World Cup Proven Composite Cage
  • Outside Facing Limit Screws – Intuitive Adjustment
  • Sealed Bearing Upper Pulley
  • Di.R.T: Direct Route Technology™
  • 1:1 Actuation Ratio™ Superior Shift Quality
  • Weight: Short 212g / Medium 227g / Long 230g

As I mentioned before, in addition to my old rear derailleur, my bicycle chain was rendered useless. Instead of getting another generic 9-speed chain from KMC, I upgraded to SRAM PC-991 chains. Not only do these have convenient Powerlink (those gold things) connectors to make installation realtively pain-free, they were also on sale at the local bike shop =).

PC-991

  • Compatibility: 9-speed
  • Push Pin Power: 200 kgf, Chrome Hardened Pins
  • Technology: PowerChain II™, PowerLink™ Gold
  • Weight: 300g / 114 Links

Given this was my first time replacing a chain and a rear derailleur, it took me a good hour or two.. or three.. to read the instructions and watch YouTube demonstrations to get the job done. Before you say anything, I know I could’ve spent the time doing something more productive and pay an expert to do the repairs, but I think that takes away from the hobby. Besides, I like fixing things. In any case, I’m sure I will be much quicker next time around. =]

Bonus:

Last week, watched the sunset at Chilao.

Link:
SRAM

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