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chain rubbing front derailleur cage

Old 09-27-12, 09:47 AM
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kevmk81 
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chain rubbing front derailleur cage

I'm stuck on how to solve a problem in having with my caad 10. When in the small chainring, largest cog on back (and a few cogs down from that one for that matter), the chain rubs on the inner inside of the front derailleur cage that guides the chain. I have set the inner screw to its limit (turned screw counter clockwise), and it still allows chain rub. Is the front derailluer installed incorrectly if it won't even allow me to set the inner limit screw to fix this? My 5 year old 9 speed doesn't even have this issue! Its a braze-on derailluer, not a clamp style. I wonder if I just need to adjust how its attached to the frame?

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Old 09-27-12, 09:53 AM
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Andy Somnifac 
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https://www.parktool.com/blog/repair-...ur-adjustments

Follow their guide. Others will chime in and say not to cross chain. They are not entirely incorrect.
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Old 09-27-12, 09:57 AM
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Originally Posted by Andy Somnifac View Post
https://www.parktool.com/blog/repair-...ur-adjustments

Follow their guide. Others will chime in and say not to cross chain. They are not entirely incorrect.
heck, I'm not even cross chaining though! Small chainring on front, largest on back isn't cross chaining, is it?? Even if I move down a cog in the back, there is still a significant amount of chain rub. :-(
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Old 09-27-12, 10:02 AM
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What happens if you disconnect the FD cable?
Does it still rub then?

I am guessing your cable is way too tight.
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Old 09-27-12, 10:29 AM
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you need to make sure FD is aligned w/chainrings and sounds like you need to loosen your FD cable some. Make sure shifter is in small ring position when refastening the cable to the FD
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Old 09-27-12, 10:46 AM
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Originally Posted by fstshrk View Post
What happens if you disconnect the FD cable?
Does it still rub then?

I am guessing your cable is way too tight.
This was my first thought also.
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Old 09-27-12, 10:48 AM
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i would agree, its probably to do with your cable, If it is too tight it will not allow the derailleur to move over far enough. That being said, You generally run into FD problems when in the largest rear cog. The angle of the chain just kind of forces this to happen.
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Old 09-27-12, 10:49 AM
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Originally Posted by kevmk81 View Post
I'm stuck on how to solve a problem in having with my caad 10. When in the small chainring, largest cog on back (and a few cogs down from that one for that matter), the chain rubs on the inner inside of the front derailleur cage that guides the chain. I have set the inner screw to its limit (turned screw counter clockwise), and it still allows chain rub. Is the front derailluer installed incorrectly if it won't even allow me to set the inner limit screw to fix this? My 5 year old 9 speed doesn't even have this issue! Its a braze-on derailluer, not a clamp style. I wonder if I just need to adjust how its attached to the frame?
Chances are, you need to play with the positioning. One way to check is to loosen the cable all togther for the FD and check for chain rub without any force being applied to the FD. Shift the RD all the way up and then down to see if there are any rubbing issues.

If there is rubbing, check the angle of the RD relative to the the chainring and ensure that they are parallel.
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Old 09-27-12, 10:59 AM
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Originally Posted by fstshrk View Post
What happens if you disconnect the FD cable?
Does it still rub then?

I am guessing your cable is way too tight.
Probably this
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Old 09-27-12, 11:19 AM
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Reading comprehension is key. I should read and not just assume the typical BF questions. Let that be a lesson.
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Old 09-27-12, 11:23 AM
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Yea he's not cross chaining so I bet the cables too tight.
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Old 09-27-12, 11:59 AM
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Cable being too tight as has been mentioned is probably the problem. If it still rubs with no tension on the cable, then your derailleur isn't aligned properly with the chainrings. Following every step in that parktool guide in the second post will fix your problem either way as both issues are discussed.
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Old 09-27-12, 12:09 PM
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Yeah, cable was too tight... d'oh!

Can't wait to ride home now. I've been just dealing with the noise for a while.

Mechanical noises make me sad. :-(
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Old 09-27-12, 12:55 PM
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Originally Posted by kevmk81 View Post
Yeah, cable was too tight... d'oh!

Can't wait to ride home now. I've been just dealing with the noise for a while.

Mechanical noises make me sad. :-(
i know how you feel. The easy way out is going to a bike shop. But I prefer figuring out what is wrong myself. That way, next time the problem arises you can deal with it. That is kind of the approach I take with bikes. I do not do a whole lot to educate myself on how to fix and maintenance things, but over the years I learn things when the need arises. That way I have learned how to deal with all common/simple problems.

There is an upside too. Every time there is something wring with your bike, you learn something new.
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Old 09-27-12, 04:44 PM
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Originally Posted by fstshrk View Post
What happens if you disconnect the FD cable?
Does it still rub then?

I am guessing your cable is way too tight.
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