Advertise on Bikeforums.net



User Tag List

Results 1 to 22 of 22

Thread: Gears messy?

  1. #1
    Senior Member
    Join Date
    Sep 2008
    Posts
    75
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Gears messy?

    I just got a Trek 7.2FX. I'll admit that I haven't owned a bike since I was a kid so I really don't know what it should feel like.....okay, when I shift gears, should it be smooth and silent? Mine sometimes is smooth, sometimes it seems to miss a little bit but I almost always hear it shift. Any advice is appreciated, I'm learning....

  2. #2
    Senior Member
    Join Date
    Jun 2008
    Location
    Near Sacramento
    Posts
    4,872
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Sounds like your derailler is a little off. On new bikes the cable will stretch some and muck up the shifting. You can either learn to handle it yourself (good info on the Park Tools web site) or take it back to the shop after 100 miles for an adjust.
    -------

    Some sort of pithy irrelevant one-liner should go here.

  3. #3
    Senior Member tntyz's Avatar
    Join Date
    Aug 2008
    Location
    Nabob, WI
    My Bikes
    '03 Trek 7500, '08 Madone 4.5
    Posts
    1,176
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Is the bike new or used? If used, maybe you just need a cleaning.

  4. #4
    Senior Member
    Join Date
    Sep 2008
    Posts
    75
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Brand new.

  5. #5
    Banned. Mr. Beanz's Avatar
    Join Date
    Dec 2005
    Location
    Upland Ca
    My Bikes
    Lemond Chambery/Cannondale R-900/Trek 8000 MTB/Burley Duet tandem
    Posts
    20,031
    Mentioned
    1 Post(s)
    Tagged
    1 Thread(s)
    Takes time for the cables to break in. Might need to adjust once or twice depending won how many miles it takes to break them in. Expect the brakes (cables) to need adjusting sometime in the future too!

  6. #6
    Bike ≠ Car ≠ Ped. BarracksSi's Avatar
    Join Date
    Jul 2007
    Location
    Washington, DC
    My Bikes
    Some bikes. Hell, they're all the same, ain't they?
    Posts
    13,857
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Bookmark these:

    http://bicycletutor.com/
    http://www.parktool.com/repair/

    Learn 'em, love 'em, live 'em.

  7. #7
    Senior Member onbike 1939's Avatar
    Join Date
    Dec 2004
    Location
    Fife Scotland
    My Bikes
    Airnimal Chameleon; Ellis Briggs; Moulton TSR27
    Posts
    1,885
    Mentioned
    6 Post(s)
    Tagged
    0 Thread(s)
    It may be that the problem is that the poster may not be releasing the pressure on the chain whilst shifting. If he has not ridden since childhood this may be the cause.

  8. #8
    Senior Member
    Join Date
    Sep 2008
    Posts
    75
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by onbike 1939 View Post
    It may be that the problem is that the poster may not be releasing the pressure on the chain whilst shifting. If he has not ridden since childhood this may be the cause.
    May be! Teach me please..


    Also, when peddling through turns, occasionally it feels like the gear "slips" and I peddle freely/no resistance for a second and then it picks back up.
    Last edited by BikeGk; 10-02-08 at 04:15 AM.

  9. #9
    tilt head to right Alpha52's Avatar
    Join Date
    Jul 2008
    Location
    on your left
    My Bikes
    Trek, Specialized, Atala, Kona
    Posts
    145
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Bookmark this site too. It is the technical docs for all things Shimano.

    http://techdocs.shimano.com/techdocs/index.jsp

    You can look up your components, and download detailed installation, tuning and trouble-shooting docs for your Shimano components.

  10. #10
    Senior Member tntyz's Avatar
    Join Date
    Aug 2008
    Location
    Nabob, WI
    My Bikes
    '03 Trek 7500, '08 Madone 4.5
    Posts
    1,176
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Most LBS's will include a free tune-up at the 100-200 mile mark or within a reasonable time from date of purchase. This is needed b/c cables stretch a little and settle into place and there's probably other causes, too.

    Sounds like it's time to do that! Get in touch with the folks you bought it from and I bet they'll get you fixed right up. I'd do that before taking on adjustment yourself, at least for the first round.

  11. #11
    Senior Member
    Join Date
    Sep 2008
    Posts
    75
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I did not mention that it is only the 3rd time that I rode the bike. Maybe it's my technique or not broken in yet?

  12. #12
    Senior Member tntyz's Avatar
    Join Date
    Aug 2008
    Location
    Nabob, WI
    My Bikes
    '03 Trek 7500, '08 Madone 4.5
    Posts
    1,176
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Since you're getting s slight skip going through turns it's likely a small adjustment issue. Doubtful that anything's broken. Just get a tune-up. If it's inconvenient to get it in, then take a look at the links that others have posted.

    Technique could be an issue, but not if your getting some slippage just peddling along. While shifting you should keep the pedals rotating, but ease up on the pressure a bit. The chain needs to be able to move from one to to the other and it can do that easier when you're not hemmering the pedals.

    Get the issue taken care of. Getting even a small slip while tackling a hill can be a real pain, especially if you're up on the pedals!

  13. #13
    Senior Member
    Join Date
    Sep 2008
    Posts
    75
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    It is a little inconvenient to go to the shop, and I'd like to attempt it myself.
    I read and watched the tutorials on rear derailleur adjustments, however I'm not sure what I need to adjust to prevent the "slipping" when peddling through a turn. Can anyone offer advice?

  14. #14
    Team Water Andy_K's Avatar
    Join Date
    Jan 2008
    Location
    Beaverton, OR
    My Bikes
    2013 Kona Jake, 2008 Kona Major Jake, 2013 Kona Jake the Snake, 1999 Kona Muni Mula, 2012 Ridley Excalibur, 2008 Surly Long Haul Trucker
    Posts
    6,809
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Good choice deciding to do this yourself. The first time I tried adjusting my own derailleur I messed it up royally. Fortunately, you can just try again until it works, usually with no worse consequence than a thrown chain.

    I don't have an answer for you about the slipping while turning, except maybe, "don't do that."

  15. #15
    Senior Member tntyz's Avatar
    Join Date
    Aug 2008
    Location
    Nabob, WI
    My Bikes
    '03 Trek 7500, '08 Madone 4.5
    Posts
    1,176
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Maybe give us a bit more detail on when this happens?

    At times my rear d gets out fo adjustment and the chain will jump off the gear for about 1/4 turn of the crank. I can't say it was specific to turning. Maybe you've got the same thing going on and it happening in turns is just coincidence.

  16. #16
    Senior Member
    Join Date
    Sep 2008
    Posts
    75
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Maybe.... I'm going riding now, so I'll pay more attention to it and report back. I just adjusted my brakes, and brakes/shifters on the handle to accommodate my hands better. I have not ridden in ages so maybe I did something wrong.

  17. #17
    Senior Member
    Join Date
    Sep 2008
    Posts
    75
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Ok, just got back. It only happened when I was peddling really slow, a gear suddenly changed/or slipped. It was also a little sloppy to switch gears at very slow speeds (I'm talking very slow, equivalent to walking speeds). Seems like it is functioning better overall, could it be that it is breaking in?

  18. #18
    Senior Member
    Join Date
    Sep 2004
    My Bikes
    Trek5000
    Posts
    949
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    This site has the perfect solution to your gear problems:

    http://sheldonbrown.com/fixed/index.html

  19. #19
    Bike ≠ Car ≠ Ped. BarracksSi's Avatar
    Join Date
    Jul 2007
    Location
    Washington, DC
    My Bikes
    Some bikes. Hell, they're all the same, ain't they?
    Posts
    13,857
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by BikeGk View Post
    Ok, just got back. It only happened when I was peddling really slow, a gear suddenly changed/or slipped. It was also a little sloppy to switch gears at very slow speeds (I'm talking very slow, equivalent to walking speeds). Seems like it is functioning better overall, could it be that it is breaking in?
    Hmm, interesting; yes, the slipping could just be an adjustment thing.

    Keep in mind, too, that it takes longer for a shift at slow speeds. Both the chainrings and the cassette (especially true with a SRAM OpenGlide cassette and its missing teeth; which shifts nicely on my bike, BTW) have sections that kind of "encourage" the chain to shift more easily, whether it's with teeth that are a little stubbier, or ramps machined into the side of the cog, or even the pins that you'd usually only see on the big chainring.

    The chain will shift, but it'll want to shift on its own at a certain point in a revolution of the wheel. When you're going really slow, then, it just takes more time for the wheel to make a whole revolution.

  20. #20
    Senior Member
    Join Date
    Sep 2008
    Posts
    75
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Ok, have been breaking it in. I went on a 5mi ride tonight. It performed well and everything was going well except toward the end of the ride I was pedaling and all of a sudden it started shifting in and out of gear until it finally got settled. I didn't even try to shift it...just sorta happened. I want to make some adjustments to the rear derailleur, but I'm unsure which screw to mess with. I guess I have to re-watch the tutorial on bicycletutor.

  21. #21
    Senior Member
    Join Date
    Jul 2006
    Location
    IN
    Posts
    77
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The Hi and Low (H& L) screws set the limits of how far the derailleur can travel.

    The barrel adjuster where the cable housing terminates at the derailleur will fine tune shifting and probably needs a slight adjusment. Don't go crazy with it. Try a 1/2 turn at a time and keep track of how far and which direction you have moved it (so you can always go back if you make it worse). Chances are, 1 full turn counter clockwise will take care of it.

    http://www.parktool.com/repair/readhowto.asp?id=64.....scroll down to "Checking the Rear Indexing Adjustment".

  22. #22
    Bike ≠ Car ≠ Ped. BarracksSi's Avatar
    Join Date
    Jul 2007
    Location
    Washington, DC
    My Bikes
    Some bikes. Hell, they're all the same, ain't they?
    Posts
    13,857
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Two more things that could affect shifting --

    1) A slightly bent derailleur hanger. Unless you're good with working metal, I'd let the shop guys do it.

    2) A derailleur hanger that's actually loose. This happened somehow with mine, and I only needed to snug down the screws holding it to the frame. Easy-peasy.

Posting Permissions

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