Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

Worn Front Derailer?

Old 06-18-08, 06:19 PM
  #1  
hanknstein
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Worn Front Derailer?

I have been having issues with chain drops on my 2+ year old Specialized Rubaix (when I shift up front). The bike came with a FSA compact crank & worked fine the first season. I started dropping my chain in during the second season with increasing frequency & brought it in to a bike shop for a tuneup. They replaced the chain with an ultegra 10 speed (the original chain was a KMC) & I dropped the chain 6 times in my first ride. After bringing it back for an adjustment, it still drops once or twice a ride. I brought my bike to a different shop & they looked at it & thought the front derailer was "all over the place". I have never had to replace a front derailer, do they wear out? Ive got less than 3000 miles on this bike.

Anybody have any similar stories or suggestions before I put a new derailer on?
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Old 06-18-08, 06:46 PM
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Check your housing for friction, and double check your limits.
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Old 06-18-08, 07:05 PM
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Hi Streetlightpoet.

I have been playing with the limits, but couldn't seem to nail it. What is the "housing", the cable housing?
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Old 06-18-08, 08:18 PM
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markyore
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Probably just needs a derailleur adjustment but a deda dog fang

http://www.dedaelementi.com/En/Produ...ctIDMaster=447

Or a third eye chain watcher should be very useful

http://www.outsideoutfitters.com/p-3...inwatcher.aspx
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Old 06-18-08, 10:49 PM
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Sorry for not being clear. Shift into your big ring, then shift just the lever to create some slack at the cable (but not actually shifting at the chain.) Work your housing free and slide it along the cable and see how freely it moves. Maybe use some triflow if it doesn't feel to bad, if you feel any sort of resistance though replace the cable.
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Old 06-19-08, 03:01 AM
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Originally Posted by streetlightpoet View Post
Sorry for not being clear. Shift into your big ring, then shift just the lever to create some slack at the cable (but not actually shifting at the chain.) Work your housing free and slide it along the cable and see how freely it moves. Maybe use some triflow if it doesn't feel to bad, if you feel any sort of resistance though replace the cable.
If that does not work, possibly the housing is worn out...if the OP does not know what that is, my guess is that neither the cables or housing have been replaced. If you are riding a decent number of miles, it's best to replace them annually.

Why a mechanic did not look at that is beyond me. Having a derailleur that "is all over the place" that's the first place to look after the obvious adjustments. If the limit screws were OK for a long while, generally that will not change. So it's almost always worn cables and housings.
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Old 06-19-08, 07:34 AM
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Thanks all, I plan on picking up the bike from the shop tomorrow & see where I stand.
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Old 06-19-08, 07:55 AM
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Something else to check. My front derailleur started acting up just a bit. I looked at the limits, the cable tension, and tweaked things. Eventually I gave up. Took it to an LBS. It took him about 7 minutes to figure it out: one of the allen screws attaching the derailleur to the frame was a little loose. The extra play threw things off. The weird part was it wasn't obvious; only under load would it slightly move.
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Old 06-19-08, 08:18 AM
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Goto a different shop. The limits are off and at 3K miles, the cables should be tightened up.
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