Sticky front mech

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Discussion

TheDrownedApe

Original Poster:

1,161 posts

62 months

Thursday 4th August 2022
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I'm now at the "I need help" stage.

105 7000 front mech, 2 years old and it's been sticky since i first had it but when it's been in LBS (warranty) they can't replicate it.

In the stand i can move it freely up and down without issue. When I'm out cycling at times (40%) it gets stuck in the big ring and i have to unclip and knock it with my heel to get it to drop to the sissy. needless to say it's been thoroughly cleaned and still happens.

The one thing i can't check is the cable as when it's on the stand i can see the cable moving, however on the bike clearly i can't see if it's loose when i drop it down.

fire away please

bigdom

2,104 posts

151 months

Thursday 4th August 2022
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I'd start with a new cable, in my experience, they cure most problems.


jamm13dodger

144 posts

42 months

Thursday 4th August 2022
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No suspension on the bike I assume? Just wondering if it could be something binding once sag occurs if it does have suspension.

If you replace the cable be sure to do the housing at the same time. Failing all that do you have anyone you can borrow a 105 front mech from just to rule out a manufacturing fault?


TheDrownedApe

Original Poster:

1,161 posts

62 months

Thursday 4th August 2022
quotequote all
jamm13dodger said:
No suspension on the bike I assume? Just wondering if it could be something binding once sag occurs if it does have suspension.

If you replace the cable be sure to do the housing at the same time. Failing all that do you have anyone you can borrow a 105 front mech from just to rule out a manufacturing fault?
hmm yeah didn't think of swapping it with my mtb. idea

JEA1K

2,544 posts

229 months

Thursday 4th August 2022
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Two things, firstly cable as suggested above but secondly, also check the lever itself and make sure the hood is correctly seated on it. The lever has a return mechanism which, if obstructed by the hood, can prevent the mechanism operating and releasing the tension in the cable, thus leaving you on the 'big plate'.;)

mike9009

7,452 posts

249 months

Thursday 4th August 2022
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A few drops of lube down the inner gear casing will loosen a binding cable..... Happened a few times on bikes which have been stood a little while.....

TheDrownedApe

Original Poster:

1,161 posts

62 months

Friday 5th August 2022
quotequote all
thanks. I can feel the "clunk" as the lever releases the tension so it's not the lever. ordered a new cable as that's easier than swapping mechs, will see