Advertise on Bikeforums.net



User Tag List

Results 1 to 7 of 7
  1. #1
    Da Big Kahuna
    Join Date
    May 2003
    Location
    Oahu, Hawaii
    Posts
    814
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Shifting problem

    On both my old Bianchi Volpe (27 gears) and my new Felt (double crank with 18 gears), I have had the same problem with getting the right adjustment on my gears.

    The problem occurs when I downshift (move to larger rear cog) from 7th gear to 6th. Even after an adjustment at the LBS, it will soon not want to downshift - either it will delay too long or not downshift to 6th at all unless I nudge the shifter over a little extra before releasing. It upshifts (to smaller cog) just fine.

    I asked the LBS about this when I had them replace the chain four days ago (no, it isn't the chain being old or stretched - it happens regardless).

    As they were checking the gears after replacing the chain, the guy said that if it gets that way and even adjusting the screw thing in back, which I had tried over and over with no improvement (turning a very little bit each time), then he said the hanger might be bent. But he said mine looked fine. Still, he got out a tool to check it and maybe made a very minor adjustment.

    So, I'm riding home and found I had the same problem going to 6th (but maybe not quite as bad) AND it had a little more of a delay sometimes downshifting to 8th and 7th as well.

    I turned the adjustment a tiny bit and everything seemed fine the rest of the way - even going down to 6th.

    Two days later I rode 54 miles. For the most part it was fine except the problem going down to 6th was back. I had to nudge it extra to get it down.

    I didn't mess with anything - just figured next chance I got I'd go to the shop again to pursue the matter.

    Then today I rode 43 miles. I decided to try adjusting it a tiny bit more to see if the problem went away some miles from home. I can't recall when I did that, but it wasn't more than 8 miles.

    Well, sometimes I felt the shifting wasn't quite right. Eventually I found it wouldn't UPSHIFT from 2nd to 3rd so, okay, I simply adjusted it back where it was so - theoretically - only the 6th gear problem should remain.

    But then things got really weird. In the lowest gear, it didn't sound right with the chain. Then the chain kept jumping between gears (typically between 1st and 2nd though I think it may have extended further than that but since I was climbing my last hill, I didn't get to check much).

    When I got home, I set it on a little stand so I could turn the cranks and experiment with the shifting. Nothing seems to work no matter how I make that adjustment.

    Now, I have two questions. The main one concerns the repeated problem, with two bikes, at downshifting to 6th gear from 7th. What are some things that could cause this?

    The other has to do with this present disaster where things are really screwed up! I just can't imagine how that small change - which just put things back the way it should have been before - caused such havoc!

  2. #2
    TÍte de Limace gurana's Avatar
    Join Date
    Jun 2005
    Location
    Maryland
    My Bikes
    '05 Specialized Allez Sport Triple
    Posts
    1,542
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I can see a few possibilities: your LBS isn't doing a good enough job in tuning this in, you just haven't found the right setting yet, or it's a problem with the component set. I have an allez sport with tiagra shifters, 105 RD and tiagra FD. I had problems with the RD shifting in similar circumstances. I was able to tune that relatively easy. However I had trouble with my FD and screwed with it enough that I just couldn't get it to work properly (might haver something to do with the fact that I broke off the cable-end ). I took it in for a tune up. If it's still giving me trouble I'm going to try minor adjustments on my own (only to the limit screws, not the cable fix) but if that doesn't fix it I'm going to assume it's just an issue with the tiagra FD.

    Les Douleurs de la Mort. :: Sed fugit interea fugit irreparabile tempus.

  3. #3
    Powered by Borscht ovoleg's Avatar
    Join Date
    Jul 2005
    Location
    SoCal
    My Bikes
    Russian Vodka
    Posts
    8,344
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)
    OMG you guys shift alot lol. I would never go from one rear cog to the next constantly, I'll just push harder

    Downtube friction shifters should solve this

    Shouldn't the LBS be able to fix this issue?

  4. #4
    Senior Member
    Join Date
    Dec 2001
    Location
    New Jersey
    Posts
    6,285
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by TheRCF
    On both my old Bianchi Volpe (27 gears) and my new Felt (double crank with 18 gears), I have had the same problem with getting the right adjustment on my gears.

    The problem occurs when I downshift (move to larger rear cog) from 7th gear to 6th. Even after an adjustment at the LBS, it will soon not want to downshift - either it will delay too long or not downshift to 6th at all unless I nudge the shifter over a little extra before releasing. It upshifts (to smaller cog) just fine.
    This sounds like a cable problem. The Volpe may need a new Cassette but I don't have the problem at all. This does not sound like a high/low problem but a cable adjustment.

  5. #5
    Da Big Kahuna
    Join Date
    May 2003
    Location
    Oahu, Hawaii
    Posts
    814
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Okay, from what I'm getting so far, it could be a component issue - but it would seem very odd to me that it would be the same with two different bikes and components!

    The other is what Dahon.Steve said - maybe a cable issue, though again the same thing on two bikes seems odd. As for a new cassette on the Volpe, I only rode it for a total of about 7000 miles and the problem didn't just start near the end, so I wouldn't think it would be worn out.

    The Felt I ride now has just passed 10,000 miles. It had a major tune-up at the end of the first year so I've gone about 3000 miles since then. Don't know if any cables were replaced/adjusted or what.

    But I was wondering, considering the crazy stuff it started doing yesterday, if something had suddenly happened to the cable. I'm not mechanically inclined at all to figure that out.

  6. #6
    TÍte de Limace gurana's Avatar
    Join Date
    Jun 2005
    Location
    Maryland
    My Bikes
    '05 Specialized Allez Sport Triple
    Posts
    1,542
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by TheRCF
    But I was wondering, considering the crazy stuff it started doing yesterday, if something had suddenly happened to the cable. I'm not mechanically inclined at all to figure that out.
    When was the last time you had your cables replaced? They don't last forever, and I'm sure the suggested replacement mileage is < 7000 mi. If it's a cable issue I'm not sure what you could do to diagnose it. You (or or LBS guy) can tighten it, because they tend to stretch out overtime. It's also possible that there's now some sort of imperfection somewhere on the cable. But unless it's on the exposed part, I don't know how you would necessarily know without pulling the cable out of the housing.

    Les Douleurs de la Mort. :: Sed fugit interea fugit irreparabile tempus.

  7. #7
    Da Big Kahuna
    Join Date
    May 2003
    Location
    Oahu, Hawaii
    Posts
    814
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Well, I now know the reason for the 2nd problem - why the shifting went berserk. The LBS does weekly clinics and this week was on adjusting gears. So I took my bike in and related my problem. They used my bike for the demo.

    Turns out that the cable where it goes into the shifter area was considerably frayed so they replaced it. Apparently the fraying just happened to reach the point of causing lots of problems just about the same time that I made that last adjustment - just a coincidence, which I figured must be the case.

    Riding back home, the matter of the other problem remains - downshifting from 7th to 6th gear. I know the gears work a little different when riding compared to sitting on a rack so no biggie. I didn't make a further adjustment myself because I didn't even want to risk another "coincidence" while trying to ride home at night. I'll probably see if I can make an adjustment next ride, just before coming home in the late morning. That is, in some ways, the bigger problem since I keep getting it.

    Bob

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •