Trim Question

badhorsy
badhorsy Posts: 107
edited December 2010 in Road beginners
Hey guys,

got a Shimano 105 triple gearset. I've been having some problems with shifting in the front, but managed to get rid of most of the issues by just tightning the cable tension (it was a little loose).

How many "trim" positions should I have? I find that when I'm the top chainring, I always have two clicks to get to middle, so that the chain doesn't rub when I'm low on the rear.
Going from the middle to the low chainring, I seem to *either* have two clicks or one click - I know it seems weird, but it really does seem to vary.
Should I have trim going from middle - low, or additional trim when I'm in low?

Comments

  • sungod
    sungod Posts: 17,355
    use/adjustment is described in the service instruction documents, they are all on http://techdocs.shimano.com

    for 105, there are several different models of shifter and front mech, you need to identify which ones you got, and then follow the instructions

    105 is all here...

    http://techdocs.shimano.com/techdocs/bl ... ID=iNmG0.1
    my bike - faster than god's and twice as shiny
  • John.T
    John.T Posts: 3,698
    All changing operations require a full movment of the lever to change gear. The trim is done with half moves and should only be done if required after changing rings. When on the big ring one full move should put you on the middle one. The chain should not rub when in lower gears at the rear. It may do so on the higher ones. If so then a half move of the large lever will move the cage outwards enough to stop this. If you get rub when on the big ring and larger sprockets then a half move of the small lever will let the cage move in a little to stop this. If your gears are not working like this then they are not set up right or you are using them wrong. You should never need two clicks to change.
    Should I have trim going from middle - low, or additional trim when I'm in low?
    You should have trim in both directions on the middle ring, trim outwards only on the granny and trim inwards only on the big ring. Most trim actions only move the cage less than 2mm.
    My Fleet.
  • hubcap
    hubcap Posts: 163
    John.T wrote:
    You should never need two clicks to change.

    Not sure I agree with this. I have Ultegra triple and when you change from the large chainring on the front to the middle, or indeed from the middle to the small, you can feel that there are two clicks. I agree that you have to carry out the movement of the lever in one motion and push it as far as it will go but you can definately feel that it goes through two clicks.
  • hubcap
    hubcap Posts: 163
    John.T wrote:
    You should never need two clicks to change.

    Not sure I agree with this. I have Ultegra triple and when you change from the large chainring on the front to the middle, or indeed from the middle to the small, you can feel that there are two clicks. I agree that you have to carry out the movement of the lever in one motion and push it as far as it will go but you can definately feel that it goes through two clicks.
  • John.T
    John.T Posts: 3,698
    Hubcap wrote:
    John.T wrote:
    You should never need two clicks to change.

    Not sure I agree with this. I have Ultegra triple and when you change from the large chainring on the front to the middle, or indeed from the middle to the small, you can feel that there are two clicks. I agree that you have to carry out the movement of the lever in one motion and push it as far as it will go but you can definitely feel that it goes through two clicks.
    By 2 clicks I was refering to 2 movements of the lever. You may notice a click as the lever passes the trim position but I never have on mine. The secret is to use full travel of the lever to change rings. Any trim needed should be back and done on the other lever. I no longer have a triple but seldom need to trim on a double. I do use the wrong speed mechs on 2 of my bikes, 8sp on 9 and 9sp on 10 which helps.
    My Fleet.

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