Front deraileur problems
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  1. #1
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    Front deraileur problems

    Started out on a club ride and suddenly the front shifter wouldn't move the chain onto the large front ring. No upper gears. Fiddled with the barrel adjuster to no avail. Left the thing with the bike shop. The groupo is Ultegra, and only about a year old. What causes this?

  2. #2
    Rub it............
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    2 things to check. See if you can manually move the FD by pulling on the cable. If you can, then check to make sure that the cable isn't broken inside the shifter.

    It does sound like to me the cable broke inside the shifter.
    You can't fix stupid.

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  3. #3
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    How many miles are on the bike? How much resistance do you feel when trying to shift to the larger chainring?

    A broken cable is indeed possible, but it is highly unusual to break a front shifter cable unless you have lots and lots of miles. The rear cable is usually the one that breaks since the rear shifter is used way more than the front shifter.
    "With bicycles in particular, you need to separate between what's merely true and what's important."-- DCGriz, RBR.

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  4. #4
    tlg
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    I bet $1 that you broke the cable.
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  5. #5
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    Quote Originally Posted by tlg View Post
    I bet $1 that you broke the cable.
    How does that happen? Bad roads? A big bump? Rough handling while shifting?

  6. #6
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    I'd say the bike has, at most, about 600 miles on it. No more. I bought it last year at the end of the season. It's a Trek Emonda 5 on which I swapped the 105 groupo for Ultegra.

  7. #7
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    Quote Originally Posted by coondogger View Post
    How does that happen? Bad roads? A big bump? Rough handling while shifting?
    The cable is most vulnerable inside the shifter where it wraps it tightly in a small circle. When you shift, it wraps and unwraps the cable which eventually leads to fraying. As I said, very unusual for this to happen on a front shifter cable, quite common on rear shifter cable. The last three generations of Shimano shifters (the ones where the cable housing goes under the handlebar tape) are notorious for this. I have to replace my rear shifter cable every 2000 miles or so.

    But at 600 miles, I really doubt it's a broken cable. How much resistance do you feel on the shifter when trying to go to the large chainring?
    "With bicycles in particular, you need to separate between what's merely true and what's important."-- DCGriz, RBR.

    “Statistics are like bikinis. What they reveal is suggestive, but what they conceal is vital.” -- Aaron Levenstein



  8. #8
    tlg
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    Quote Originally Posted by coondogger View Post
    How does that happen? Bad roads? A big bump? Rough handling while shifting?
    Normal wear and tear.

    Shimano cables are notorious for fraying and breaking. Particularly 10sp and 11sp. (10sp was worse, 11sp is a little better) There is a tight bend inside the shifter. The constant movement over the bend causes the wires in the cable to weaken, fray and break.

    Usually the rear shifter goes more frequently since you shift more with the rear. It's typical for rear cables to fray/break in the 3k-5k mile range.
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  9. #9
    tlg
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    Quote Originally Posted by coondogger View Post
    I'd say the bike has, at most, about 600 miles on it. No more.
    Ok, that's odd then. Not likely a broken cable.

    My $2 bet.... the pinch bolt wasn't tight enough and the cable slipped.
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  10. #10
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    Quote Originally Posted by tlg View Post
    I bet $1 that you broke the cable.
    Quote Originally Posted by coondogger View Post
    I'd say the bike has, at most, about 600 miles on it.
    I bet you $2 that he didn't.
    "With bicycles in particular, you need to separate between what's merely true and what's important."-- DCGriz, RBR.

    “Statistics are like bikinis. What they reveal is suggestive, but what they conceal is vital.” -- Aaron Levenstein



  11. #11
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    Quote Originally Posted by tlg View Post
    My $2 bet.... the pinch bolt wasn't tight enough and the cable slipped.
    That' my $3 bet.

  12. #12
    'brifter' is a lame word.
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    Quote Originally Posted by Kerry Irons View Post
    That' my $3 bet.
    I'll see your $3 and raise you to $5.
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  13. #13
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    Pinch bolt. That is plausible. Cable snapped? Not so much.

  14. #14
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    Quote Originally Posted by coondogger View Post
    Pinch bolt. That is plausible. Cable snapped? Not so much.
    Well have you checked it yet to prove one way or the other?

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    Quote Originally Posted by JoeDaddio

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  15. #15
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    How do you know how much he changes his front rings? I'll go with the the broken cable.
    If you ride rollers a lot, one uses the FD as much as the RD. ....almost.
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  16. #16
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    Quote Originally Posted by duriel View Post
    How do you know how much he changes his front rings? I'll go with the the broken cable.
    If you ride rollers a lot, one uses the FD as much as the RD. ....almost.
    600 miles is a stretch (no pun intended) even for a rear cable.
    "With bicycles in particular, you need to separate between what's merely true and what's important."-- DCGriz, RBR.

    “Statistics are like bikinis. What they reveal is suggestive, but what they conceal is vital.” -- Aaron Levenstein



  17. #17
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    Sport's drink glue??? Do you slop sport's drink down the outside of the down tube???
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  18. #18
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    Turns out, it's the shifter; it failed. They're just waiting for the a new shifter from Trek. Who knew?

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    Quote Originally Posted by coondogger View Post
    Turns out, it's the shifter; it failed. They're just waiting for the a new shifter from Trek. Who knew?
    They are waiting on a shifter from Shimano. Trek does not cover that, Shimano does. Better stay on top of the shop on this one.

  20. #20
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    Quote Originally Posted by coondogger View Post
    Turns out, it's the shifter; it failed. They're just waiting for the a new shifter from Trek. Who knew?
    Unusual, but it does happen. Shimano is pretty good about warranty coverage. I bought a bike with a Shimano RS-11 wheelset. A year later, the bearings went south on the front wheel to the extent that the cup was scoured. Long story short, my shop convinced Shimano to give me a brand new wheelset - both front and rear so they would match!
    "With bicycles in particular, you need to separate between what's merely true and what's important."-- DCGriz, RBR.

    “Statistics are like bikinis. What they reveal is suggestive, but what they conceal is vital.” -- Aaron Levenstein



  21. #21
    'brifter' is a lame word.
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    Quote Originally Posted by 202cycle View Post
    They are waiting on a shifter from Shimano. Trek does not cover that, Shimano does. Better stay on top of the shop on this one.
    ^This^
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    and a bunch of skateboards

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