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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

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Old 03-27-11, 02:48 PM   #1
climber7
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front derailleur problem

halfway through my ride yesterday, i got stuck in the big chainring. shifting still moved the FD, just not enough to push the chain down. i worked on it for a while today with some help. messed around with limit screws, cable tension, etc. it's not stuck in the big ring any more, but...

if i adjust it so that it shifts UP ok, if i push the shifter all the way, it sometimes throws the chain off the outside of the big ring.

if i adjust it so that it doesn't drop the chain, it won't shift up at all.

FD is shimano 105 5600 braze-on. shifters are shimano 105 5600 (for double or triple). crankset is fsa gossamer pro compact BB30. bike is relatively new (bought it new in august 2010), so it has less than 1400 miles on it, 400 of which are on the trainer.

thoughts? does this seem like a problem with shifter, derailleur, or cables? or maybe even crankset/chainrings?

i'll post in mechanics' thread also.

thanks!
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Old 03-27-11, 03:01 PM   #2
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http://bicycletutor.com/adjust-front-derailer/

You can skip ahead to where he adjusts limit screws.

Last edited by hairnet; 03-27-11 at 03:04 PM.
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Old 03-27-11, 03:16 PM   #3
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yeah, i know how to do that already, and i tried it. as i said, if i do that, it won't shift up. if i change it so it shifts up, it throws the chain.
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Old 03-27-11, 03:47 PM   #4
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But are you adjusting the derailer like he is? You should start over by adjusting the lower limit and setting cable tension then move on to the high gear limit. You say you have it shifting down. So, you can try to shift to big ring/small cog and loosen the limit screw while turning the cranks until the chain catches.

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if i do that, it won't shift up. if i change it so it shifts up, it throws the chain.
it seems like you're turning the screw too much. You can also try to pulling on the cable to bypass the shifters

Last edited by hairnet; 03-27-11 at 03:54 PM.
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Old 03-27-11, 03:52 PM   #5
CNY James
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+



+



=

fixed.
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Old 03-27-11, 04:01 PM   #6
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Dude, just get it over with and break that left shifter. Shimano will replace it a double specific since they already know that it's a POS. I had the same set-up on my bike - it took a 11 months, but it finally took a ****.

The small chain ring is the 'natural' position for the FD - with no tension on the cable, that's where it should rest. If it's not moving there, there's too much tension on the cable or the limit is set improperly or (maybe?) the FD alignment is off. Might as well detach the cable and start from scratch with the FD height, alignment and lower limit. After that, re-connect the cable (make sure you've clicked the lever in to the small ring position first) and get to setting the upper limit.
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Old 03-27-11, 04:32 PM   #7
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hairnet - yes. i did exactly what that article says.
EDIT: and i did pull on the cable rather than using the shifter.

whyfi - breaking it is pretty tempting...maybe i'll start pushing the shifters extra hard. as for the adjustments, i got it to go back down, so i no longer have that problem. now i just can't get it to shift both directions without throwing the chain. as for height/alignment, i'm not a trained mechanic, but it looks good to me based on what i've read.

i'll go through all that routine stuff again just to make sure, though.

CNY james - if i give it one more shot and can't get it, that's the next step. i enjoy working on and learning about my own bike, though, so if i can figure it out, i'd rather do it that way.
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