chain touching the outer part of front mech.

Jerryhughes101
Jerryhughes101 Posts: 21
edited July 2014 in Workshop
Hi guys, I assume this is quite a common problem as I've googled and seen a few videos talking about how to adjust the mech etc.

My question is really, for someone who isn't very confident with doing stuff like this (in the past I've damaged cables adjusting the rear mech), is it as simple as just turning a screw or do I have to loosen cables etc and do a bit more work?

I've attached a photo of the problem at the moment, as you can see it's resting against the mech so when I rode home on Friday I could hear it and I just thought the lube had worn down and chain needed cleaning + re-applying.

Thanks!

http://s29.photobucket.com/user/jerryhu ... n-mech-rub - photo :)

Comments

  • Matthewfalle
    Matthewfalle Posts: 17,380
    Case of just twiddling screws from what I can make out - mech so chain is on inner ring, cable slack, twiddle screw to move mech out wards, job jobbed.
    Postby team47b » Sun Jun 28, 2015 11:53 am

    De Sisti wrote:
    This is one of the silliest threads I've come across. :lol:

    Recognition at last Matthew, well done!, a justified honour :D
    smithy21 wrote:

    He's right you know.
  • Jon_1976
    Jon_1976 Posts: 690
    Probably needs a bit more cable tension or the high limit screw loosening. More likely to be cable tension.

    With the bike stationary and in big ring - smallest sprocket. push the shifter ( to change onto the big ring) the furthest it will move and hold it there. Check for clearance (if there is, the limit screw is ok. If not, loosen the screw to get the required clearance). If there is clearance but it disappears when you release the lever, the cable tensions needs increasing.
  • Jerryhughes101
    Jerryhughes101 Posts: 21
    I did the shifter check, the spacing was minimal, I (nervously) turned the high screw anti clockwise a small bit at a time and it now seems to have a bit more spacing in between it than before, thank you so much!

    Am I right in thinking that I've read the optimal spacing is about 2-3mm? I think I read somewhere about a coin fitting in between it or something?
  • Matthewfalle
    Matthewfalle Posts: 17,380
    Yup - 2 or 3mm is cool or just whack it on a stand and spin away turning the screw a tadge at a time until you're happy.
    Postby team47b » Sun Jun 28, 2015 11:53 am

    De Sisti wrote:
    This is one of the silliest threads I've come across. :lol:

    Recognition at last Matthew, well done!, a justified honour :D
    smithy21 wrote:

    He's right you know.
  • Jon_1976
    Jon_1976 Posts: 690
    Jerryhughes101 wrote:
    I did the shifter check, the spacing was minimal, I (nervously) turned the high screw anti clockwise a small bit at a time and it now seems to have a bit more spacing in between it than before, thank you so much!

    Am I right in thinking that I've read the optimal spacing is about 2-3mm? I think I read somewhere about a coin fitting in between it or something?

    2-3mm is usually the distance recommended between the mech cage and big chainring teeth. You want the chain clearance to be as small as possible, whilst avoiding chain rub. Usually about 1mm is the most you need. If you need more, check the cage is aligned correctly with the big chainring.
  • papavero
    papavero Posts: 57
    Go to the manufacturers web site, find the support section and down load the instructions for setting up a front mech. It's dead easy and fool proof if you follow the instructions slowly and calmly.

    Shimano and campagnolo are very similar, start with the cable loose set the mech parallel with the chain ring and About 2mm above. Chain on big at the back, small at the front, set the inner limit screw so the cage is just clear of the chain. Now pull the cable tight and lock it down. Change to the big ring at the front (still big at the back) and use the barrel adjuster to set the cable tension so that the mech shifts properly and the inside of the mech is just clear of the chain.
  • Jon_1976
    Jon_1976 Posts: 690
    I always recommend this vid http://m.youtube.com/watch?v=lxV_vKlgolc so easy to follow 8)
  • Jerryhughes101
    Jerryhughes101 Posts: 21
    Jon_1976 wrote:
    I always recommend this vid http://m.youtube.com/watch?v=lxV_vKlgolc so easy to follow 8)

    Ooh thanks, that's probably better than ones I've seen so far, I don't like taking the cables out, that's my main fear, last time I did the rear mech one it was too slack and then I pulled off the cap trying to pull it tight and then it split haha... Proper rage fest occurred!
  • Jon_1976
    Jon_1976 Posts: 690
    Don't be afraid to do the work yourself mate, it's a good way of saving money for starters :D In Jan 2013, I got my first road bike and didn't have a clue on anything. There's so much useful information, tutorials and videos on the web that by February I'd built a bike from scratch.
  • lapavoni10
    lapavoni10 Posts: 146
    Don't be afraid to do the work yourself mate, it's a good way of saving money for starters

    And the less you will be phased if something goes wrong out on the road!!
  • Jerryhughes101
    Jerryhughes101 Posts: 21
    ha yeah I know, I'm getting there. I can do most of the real basics, it's mainly the cables I've had problems with in the past really!

    Before I do the next thing I'll just come back here and ask/check again before I do something to give me the confidence ;)

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