Advertise on Bikeforums.net



User Tag List

Results 1 to 10 of 10
  1. #1
    Senior Member phx1973's Avatar
    Join Date
    Oct 2010
    Location
    Gilbert, Arizona
    My Bikes
    2011 Kona Dew
    Posts
    152
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Delayed Gear Shifters

    You will have to excuse a newbie question, of something that i'm sure has been discussed in these forums at length...I have a used Motobecane Record (Road Bike) that supposedly has about 100 miles on it. I took it to my LBS and they said a tuneup probably wasn't necessary unless I was having problems. Well guess what, now I seem to have found a problem. I have about a 4.3 mile commute to and from work, and today on the way home I noticed that when I shift gears, it does not engage right away. Sometimes a few seconds go by and then it shifts, sometimes not at all. Then I might try shifting up or down again, and I can hear it shift both gears at once. Doesn't seem good to say the least, but I know so little about bike mechanics, I thought I would check in here.

    What say you?

  2. #2
    Senior Member
    Join Date
    Mar 2010
    Location
    Southwest Washington
    My Bikes
    '77 Traveller III '05 Rockhopper.
    Posts
    337
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    If this is happening in most gears, it sounds like you got some dirt in the system, or perhaps a kink in the housing somewhere. Check that out and lube as necessary. Also, the indexing could be off.
    Trim adjustment is most likely...

    Validate indexing first. Turn the adjusting barrel "in" (into the dérailleur) just a little bit. I'd recommend about a quarter turn at a time. This should hasten shifting into higher gears (smaller cogs) and run through the gears to see if there is improvement. Lather rinse, repeat. If you go too far, it will have slow down shifting (into bigger cogs). Then you will need to turn the adjuster "out" (as if you are removing it from the dérailleur). Repeat until it shifts both ways equally.
    - Solo Attack: When you attack, let the sprint group lead you out. You take no points. But when they sit up, you put your head down and hold threshold. Remember: When you see Jesus you are still about 2 minutes from blacking out. Hang on.

  3. #3
    Guest
    Join Date
    Jul 2008
    Location
    Grid Reference, SK
    My Bikes
    I never learned to ride a bike. It is my deepest shame.
    Posts
    3,769
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    How old is this bike? Does it even have indexed (click) shifting?

    If it is indexed shifting, you may not benefit from a full 'tune up' but probably just need some minor adjustments, or maybe a cable replacement or cleaning.

  4. #4
    Senior Member phx1973's Avatar
    Join Date
    Oct 2010
    Location
    Gilbert, Arizona
    My Bikes
    2011 Kona Dew
    Posts
    152
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by LarDasse74 View Post
    How old is this bike? Does it even have indexed (click) shifting?

    If it is indexed shifting, you may not benefit from a full 'tune up' but probably just need some minor adjustments, or maybe a cable replacement or cleaning.
    Good question. I am actually not sure, but I think the bike is a 2007, seems to have pretty modern components all the way around. Either way, I appreciate the suggestion about doing some minor adjustments, rather than a full tune-up. I think you may be right. Thanks again.

  5. #5
    Senior Member
    Join Date
    Oct 2009
    Location
    Northern/Central VA
    My Bikes
    Specialized Sirrus, Univega Activa ST Hybrid, 70's Schwinn Traveler, Giant Innova, Nishiki Mixte
    Posts
    213
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    If it is occurring primarily on the the down shift to smaller ring or rear gear, check the cables going under the bottom bracket. That is the highest friction point in the system and also the area most likely to pick up crud from the road as well as corrode from exposure to road salt, or puddles. It is in direct line of the front tire as it flings debris/water during front wheel rotation.

    If the cables in this area have a white haze, the zinc plating is starting to fail and will roughen the cables a bit as well as swell and get grabby entering the cable housing at the base of the down tube. If you plan to keep the bike for a long time, and ride in all weather, replace the cables and housings with stainless cables, a bit pricier, but you will never replace the cable again for rust until they mechanically fail.
    The tyranny of a multitude is a multiplied tyranny.

    When bad men combine, the good must associate; else they will fall one by one, an unpitied sacrifice in a contemptible struggle.

    - Edmund Burke

  6. #6
    Senior Member BCRider's Avatar
    Join Date
    Mar 2008
    Location
    The 'Wack, BC, Canada
    My Bikes
    Norco (2), Miyata, Canondale, Soma, Redline
    Posts
    5,410
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Very likely all that you need is to slightly adjust the thimble on the derrailleur to even the up and downshifts. This sort of periodic adjustment is extremly basic and should become second nature to you. If you didn't know about this and don't know how to do it then it is high time you learned. There are a few basics about riding a bike that all riders should know and trimming the cable to even up the shifting is one of them.

    If you do know about this and tried it and the shifting is still being delayed then you can move on to suspecting a frayed or gunked up cable or a housing that the cable has worn a tight fitting groove into the inner lining and it's grabbing at the cable. If cleaning the cable and housing out doesn't fix it then swap out the housing. If the cable is kinked or frayed at all then swap that out as well. Once you do that and re-trim the shifting it should be good for a while.
    Model airplanes are cool too!.....

  7. #7
    Senior Member
    Join Date
    Oct 2010
    Posts
    173
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    sorry i just a newbie here too
    riding bike is a lifestylehttp://www.free123.net/sig/27/smile.gif

  8. #8
    Senior Member
    Join Date
    Jun 2010
    Location
    Pearland, Texas
    My Bikes
    Cannondale, Trek, Raleigh, Santana
    Posts
    5,403
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    phx1973, I just had a similar problem on a bike I'd just rebuilt. I had hesitation and some non shifts that'd end up double shifting in the middle of the cassette. This type of failure typically happens with cable housing reseating itself at one end or the other of where it seats.

    There is a barrel adjuster on the rear derailleur that positions the cable housing. Screw the barrel slightly outwards (CCW) if failing to shift to a larger gear, the reverse if to a lower gear. You'll need to have the rear wheel off the ground and crankarm clearance as you're going to be up/down shifting until the adjustment is correct. It's a trial and error thing and you'll likely make things worse before better, don't worry about it as you're learning.

    Brad

  9. #9
    Mechanic/Tourist
    Join Date
    Apr 2007
    Location
    Syracuse, NY
    My Bikes
    2008 Novara Randonee - love it. Would have more bikes if I had time to ride them all. Previous bikes: 1968 Motobecane Mirage, 1972 Moto Grand Jubilee (my fav), Jackson Rake 16, 1983 C'dale ST500.
    Posts
    4,695
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    The reason you see two different causes above (essentially friction and adjustment) is that the fix depends on where you are experiencing the delay. If the delay happens when you are shifting to higher gears (smaller cogs) then the problem is friction, because on those shifts it it the derailleur spring pulling the cable that is completing the shift. If it happens when shifting to higher gears (larger cogs) then it is an adjustment issue. Adjustment cannot make the shift in both directions slow, and only very high friction could cause a slow shift in both directions. If you are somehow experiencing delay in both directions then either you have both of the above problems or something is seriously wrong with your shift lever.

  10. #10
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    39,018
    Mentioned
    20 Post(s)
    Tagged
    0 Thread(s)

    In the old days the technique was overshifting, push the lever pulling on the derailleur
    just past the derailleur pulley wheel being centered over the cog,
    then when the gear completely engaged in its new position re center the lever back.

Posting Permissions

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