Advertise on Bikeforums.net



User Tag List

Page 1 of 2 12 LastLast
Results 1 to 25 of 47
  1. #1
    crotchety young dude el twe's Avatar
    Join Date
    Jan 2005
    Location
    SF, CA
    My Bikes
    IRO Angus; Casati Gold Line; Redline 925; '72 Schwinn Olympic Paramount
    Posts
    4,818
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Chain skipping gone weird

    I finally got the Casati all dialed in, strung up the derailleurs and had some trouble shifting into the lowest gears, but eventually got it. Now, originally I had problems with the chain skipping and heard that I should move the wheel back a little in the dropouts, so I went ahead and pushed it all the way back. Kept skipping, so I replaced the freewheel with an almost NOS Regina. Since it was STILL skipping, I ordered new jockey wheels from Soma. Got it all re-done today, and guess what? My chain skips in the middle cogs on the freewheel.

    My only current theory is that the chain is just the tiniest bit too narrow. It's an 8-7-6-speed Sram chain. Should I look into getting a(nother) new chain and seeing if that solves the problem? Any other ideas?
    Quote Originally Posted by CardiacKid View Post
    I explained that he could never pay me enough cash for the amount of work I had put into that bike and the only way to compensate me for it was to ride the hell out of it.
    IRO Angus Casati Gold Line

  2. #2
    Senior Member
    Join Date
    Mar 2006
    Posts
    2,413
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Assuming you are using friction shifters? Are you using an narrow style freewheel, to run 6 speeds in a 120mm frame? Sometimes a chain will be too wide for those and not seat on the center cogs. I've had trouble with Regina narrow sets. But it sounds like you have the right type of chain.

    I've never had the opposite problem of too narrow a chain. But since you've replaced everything else I would at least try a chain off something else just to see if anything changes. Unless you have a very large low gear, having the wheel all the way back will not solve anything. Italian race bikes should have the adjuster screws all the way in!

  3. #3
    crotchety young dude el twe's Avatar
    Join Date
    Jan 2005
    Location
    SF, CA
    My Bikes
    IRO Angus; Casati Gold Line; Redline 925; '72 Schwinn Olympic Paramount
    Posts
    4,818
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    No, the frame's spaced at 126. I had heard that the Nuovo Record rear der can be picky with the wheel too close up. I'll probably take it into the LBS where I work tomorrow and see if there are any other suggestions.
    Quote Originally Posted by CardiacKid View Post
    I explained that he could never pay me enough cash for the amount of work I had put into that bike and the only way to compensate me for it was to ride the hell out of it.
    IRO Angus Casati Gold Line

  4. #4
    Senior Member
    Join Date
    May 2005
    Posts
    181
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I had the same problem, did many of the same things you did with no improvement. Finally figured out that the chain itself had a couple of links that did not move freely like they should. When the stiff links hit the freewheel, all heck broke loose. A little penetrating oil and some moving the offending portion back and forth fixed the problem.

  5. #5
    Freewheel Medic pastorbobnlnh's Avatar
    Join Date
    Oct 2005
    Location
    Trying to Ride in the NH Mountains!
    My Bikes
    Vintage Schwinns, Classy Cannondales, & an '83 Santana Tandem
    Posts
    8,967
    Mentioned
    5 Post(s)
    Tagged
    0 Thread(s)
    Tim, you said this happens in the "middle cogs." By chance are your friction shifters loose and move more freely in the mid range? If so the spring in the N/R RD might just be pulling the chain off to the next cog. Does it tend to only skip in one direction? Down to a smaller cog? The other possibility is that the RD is bent and the jockey pulleys not lining up with the freewheel cogs correctly.
    Last edited by pastorbobnlnh; 04-03-07 at 05:55 AM.
    Bob
    Dreaming of Summertime in NH!

    Visit my websites:
    FreeWheelSpa.com orpastorbobnlnh.com

  6. #6
    Senior Member
    Join Date
    Dec 2005
    Posts
    7,695
    Mentioned
    3 Post(s)
    Tagged
    1 Thread(s)
    I'd suspect the chain since you've dealt with everything else. I'm assuming what you describe is that it skips under a load, not self shifting as Bob describes? Is the derailleur fully tightened on to the dropout (and thus has no play)?

    Neal

  7. #7
    Seņor Member USAZorro's Avatar
    Join Date
    Oct 2004
    Location
    Carlisle, PA
    My Bikes
    1954 Hetchins M.O., 1959 Viking Severn Valley, 1970 Raleigh Pro, 1972 Fuji "The Finest", 1974 Raleigh Superbe&Comp, 1976 Raleigh Team Pro, 1994 Trek 830 MTB, 2000 Bob Jackson Arrowhead, Unicycle
    Posts
    13,034
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    How many speeds? Indexed or friction?

    I'm cheap, and use the HKK Z-Chains. I had a similar problem with the lower gears (high tooth-count) on a Miyata 210. Replacing the existing chain with a Z-Chain helped a lot, but the problem didn't go away until I replaced the 5 speed Sun Tour freewheel with a 6 speed (seems counter-intuitive doesn't it?) Shimano freewheel.
    The search for inner peace continues...

  8. #8
    Senior Member nick burns's Avatar
    Join Date
    Oct 2004
    Location
    Absecon, NJ
    My Bikes
    Puch Luzern, Puch Mistral SLE, Bianchi Pista, Motobecane Grand Touring, Austro-Daimler Ultima, Legnano, Raleigh MountainTour, Cannondale SM600
    Posts
    2,941
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    My money's on the chain. Try a new one.

  9. #9
    Senior Member Bikedued's Avatar
    Join Date
    Jul 2004
    Posts
    8,933
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    My 83 Trek is doing the exact same thing, skipping in the middle cogs. I've had a new chain, and the chain that was on it when I found it. It only skips slightly less than with the new chain. New cables, and RD is an NOS Cyclone M-II. The shifter "wingnuts" are tight. Should I try the old BL?,,,,BD
    "Whale. Oil. Beef. Hooked!" The Rumjacks

  10. #10
    Don't call me sir cmdr's Avatar
    Join Date
    Jun 2006
    Location
    Charlottesville, VA
    My Bikes
    1954 Holdsworth 3 speed, 1969 Bob Jackson, 1988 Miyata Twelve Hundred (retired), 1989 Schwinn Paramount, 2004 Santa Cruz Blur Classic, 2012 Specialized P3, 2013 Specialized Roubaix Expert Disc
    Posts
    616
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I had skipping on my 84 Trek. I wracked my brain for a long time trying to figure it out.
    I needed to tighten the bolt on the shifter. Doh!
    1969 Bob Jackson, 1989 Schwinn Paramount, 2004 Santa Cruz Blur, 2011 Specialized P-3, 2013 Salsa Colossal Ti

  11. #11
    Senior Member Bikedued's Avatar
    Join Date
    Jul 2004
    Posts
    8,933
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    Mine isn't jumping from gear to gear, it stays in one gear and jumps. Causes the crank to lurch forward while pedaling. The bike is IN one gear while doing this. I installed another helicomatic from my PH10 peugeot, and it was full speed ahead, no problems.,,,,BD

    Cogs are shot I guess. Sorry not trying to hijack. My bike is doing the same thing that's all.
    "Whale. Oil. Beef. Hooked!" The Rumjacks

  12. #12
    crotchety young dude el twe's Avatar
    Join Date
    Jan 2005
    Location
    SF, CA
    My Bikes
    IRO Angus; Casati Gold Line; Redline 925; '72 Schwinn Olympic Paramount
    Posts
    4,818
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Huh, could be that the cage is bent. I'll check it out when I get home.
    Quote Originally Posted by CardiacKid View Post
    I explained that he could never pay me enough cash for the amount of work I had put into that bike and the only way to compensate me for it was to ride the hell out of it.
    IRO Angus Casati Gold Line

  13. #13
    crotchety young dude el twe's Avatar
    Join Date
    Jan 2005
    Location
    SF, CA
    My Bikes
    IRO Angus; Casati Gold Line; Redline 925; '72 Schwinn Olympic Paramount
    Posts
    4,818
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    It's friction shifting and the lever is tight. 6-speed. The bolt is well secured. Also, it's not skipping to a smaller cog, it skips and remains in the same gear.
    Quote Originally Posted by CardiacKid View Post
    I explained that he could never pay me enough cash for the amount of work I had put into that bike and the only way to compensate me for it was to ride the hell out of it.
    IRO Angus Casati Gold Line

  14. #14
    Senior Member
    Join Date
    Nov 2006
    Posts
    92
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Had the same issue myself recently and as mentioned earlier in the thread it ended up to be stiff links in the chain. The problem was the chain would skip on some cogs (not all) it would not skip to another cog. Tried everything and as a last resort swapped out the chain which was only a week old..... problem solved. Why not give it a go?

    385xza

  15. #15
    crotchety young dude el twe's Avatar
    Join Date
    Jan 2005
    Location
    SF, CA
    My Bikes
    IRO Angus; Casati Gold Line; Redline 925; '72 Schwinn Olympic Paramount
    Posts
    4,818
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    No, I know the links are good. I've checked them all already.
    Quote Originally Posted by CardiacKid View Post
    I explained that he could never pay me enough cash for the amount of work I had put into that bike and the only way to compensate me for it was to ride the hell out of it.
    IRO Angus Casati Gold Line

  16. #16
    Senior Member Bikedued's Avatar
    Join Date
    Jul 2004
    Posts
    8,933
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    Mine too, even had a new chain on it. It was worse with the new chain, lol.,,,,BD
    "Whale. Oil. Beef. Hooked!" The Rumjacks

  17. #17
    Don't call me sir cmdr's Avatar
    Join Date
    Jun 2006
    Location
    Charlottesville, VA
    My Bikes
    1954 Holdsworth 3 speed, 1969 Bob Jackson, 1988 Miyata Twelve Hundred (retired), 1989 Schwinn Paramount, 2004 Santa Cruz Blur Classic, 2012 Specialized P3, 2013 Specialized Roubaix Expert Disc
    Posts
    616
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Bent teeth on the cog? I don't know how it happens, but I had two on a freewheel that I got with a replacement wheel from one of the LBS's
    I think I saw something about how to repair them on Sheldon's site.
    1969 Bob Jackson, 1989 Schwinn Paramount, 2004 Santa Cruz Blur, 2011 Specialized P-3, 2013 Salsa Colossal Ti

  18. #18
    Senior Member
    Join Date
    Jun 2006
    Posts
    8,126
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by el twe
    No, the frame's spaced at 126. I had heard that the Nuovo Record rear der can be picky with the wheel too close up. I'll probably take it into the LBS where I work tomorrow and see if there are any other suggestions.
    Double check by hand the chain completely for a stiff link(s).
    Check the derailluer hanger for alignment, often out by the way. The Shimano tool is best, from the SIS days.

    Checking the cogs carefully, for bent teeth as stated and Cupping, depending on the ratio, that can happen to Reginas if somone attempted to take them apart, note the intercog spacing adjacent and between to all troubled cogs, its micrometer time. It can be very slight.

    Unless you know the history of the freewheel personally, even a slightly used unit when run with a stretched chain can cause havoc.

    Check the rear derailluer for alignment, best test is with the jockey wheels removed and with the parallellogram spring out, I have seen units that "look" good be bent from a wreck and or botched shift, rare, but what can happen is that at certian angles of the cage to the freewheel, the jockey wheels are not in alignment and the skipping is an "autoshift" in progress.

  19. #19
    crotchety young dude el twe's Avatar
    Join Date
    Jan 2005
    Location
    SF, CA
    My Bikes
    IRO Angus; Casati Gold Line; Redline 925; '72 Schwinn Olympic Paramount
    Posts
    4,818
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I'm thinking the derailleur's just shot. I'll double check the hanger, just in case. Grrrr.
    Quote Originally Posted by CardiacKid View Post
    I explained that he could never pay me enough cash for the amount of work I had put into that bike and the only way to compensate me for it was to ride the hell out of it.
    IRO Angus Casati Gold Line

  20. #20
    Senior Member Bikedued's Avatar
    Join Date
    Jul 2004
    Posts
    8,933
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    I'm not sure what the adjuster screw is called where the RD mounts on the dropout. I unscrewed mine nearly all the way and it seem to help a bit. I still can't stand on it, but I can pedal harder than just cruising
    on all but one gear.,,,,BD
    "Whale. Oil. Beef. Hooked!" The Rumjacks

  21. #21
    Freewheel Medic pastorbobnlnh's Avatar
    Join Date
    Oct 2005
    Location
    Trying to Ride in the NH Mountains!
    My Bikes
    Vintage Schwinns, Classy Cannondales, & an '83 Santana Tandem
    Posts
    8,967
    Mentioned
    5 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by el twe
    I'm thinking the derailleur's just shot. I'll double check the hanger, just in case. Grrrr.
    Tim, can you take some close up pics of the RD, chain, FW, etc and let us take a look before you start adding to the landfill? Someone's eagle eye should be able to spot the cause(s) of your problem.
    Bob
    Dreaming of Summertime in NH!

    Visit my websites:
    FreeWheelSpa.com orpastorbobnlnh.com

  22. #22
    crotchety young dude el twe's Avatar
    Join Date
    Jan 2005
    Location
    SF, CA
    My Bikes
    IRO Angus; Casati Gold Line; Redline 925; '72 Schwinn Olympic Paramount
    Posts
    4,818
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)







    Let me know if you'd like any more pictures.
    Quote Originally Posted by CardiacKid View Post
    I explained that he could never pay me enough cash for the amount of work I had put into that bike and the only way to compensate me for it was to ride the hell out of it.
    IRO Angus Casati Gold Line

  23. #23
    Senior Member intron's Avatar
    Join Date
    Jun 2005
    Posts
    310
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    maybe not enough chain wrap? maybe add more links to the chain, or mess with the "b" screw adjuster if you have one.

    edit: i don't see a b-screw (think this is what bikedued is refering to)

    rollin' and tumblin'

  24. #24
    crotchety young dude el twe's Avatar
    Join Date
    Jan 2005
    Location
    SF, CA
    My Bikes
    IRO Angus; Casati Gold Line; Redline 925; '72 Schwinn Olympic Paramount
    Posts
    4,818
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Just added two more links to the chain (anymore and it'll be way too loose in the small ring), didn't get any better.
    Quote Originally Posted by CardiacKid View Post
    I explained that he could never pay me enough cash for the amount of work I had put into that bike and the only way to compensate me for it was to ride the hell out of it.
    IRO Angus Casati Gold Line

  25. #25
    Senior Member intron's Avatar
    Join Date
    Jun 2005
    Posts
    310
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    hmm...you said almost NOS freewheel? how NOS? those middle rings are the ones that usually get used the most.

    rollin' and tumblin'

Page 1 of 2 12 LastLast

Posting Permissions

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