Advertise on Bikeforums.net



User Tag List

Results 1 to 18 of 18
  1. #1
    L T X B O M P F A N S R apricissimus's Avatar
    Join Date
    Jun 2008
    Location
    Melrose, MA
    My Bikes
    Bianchi Volpe, Bianchi San Jose, Redline 925
    Posts
    2,226
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)

    Excessive cog wear after only 900 miles?

    Last night I changed the chain on a new bike I bought in May. I've only put 900 miles on it. This morning with the new chain on, I got some pretty extreme chain slippage while in the two rear cogs I use the most. There's no stiff link on the new chain, and everything was working just dandy prior to changing the chain.

    Is it possible that I have that much wear on my cogs after only 900 miles? The old chain did have some stretch on it, but only 1/16 to 1/8 inch.

  2. #2
    surly old man jgedwa's Avatar
    Join Date
    Sep 2006
    Location
    Carlisle, PA
    My Bikes
    IRO Mark V, Karate Monkey half fat, Trek 620 IGH, Cannondale 26/24 MTB, Amp Research B3, and more.
    Posts
    3,268
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    That is a lot of stretch, actually.

    Are you sure you have the same number of links on the new chain?

    Are you sure you have the right chain?

    You might clean and lube and adjust the derailleur to see if you can improve it.

    You might also ride it for a little bit to see if the chain/cog marry better.

    But it sounds like you need a new cassette. Many people change chain/cassette together as a matter of habit. I would have hoped that 900 miles would not have required this, but with that kind of stretch, I think that is what you are looking at.

    jim
    Cross Check Nexus7, IRO Mark V, Trek 620 Nexus7, Karate Monkey half fat, IRO Model 19 fixed, Amp Research B3, Surly 1x1 half fat fixed, and more...
    --------------------------
    SB forever

  3. #3
    Senior Member
    Join Date
    Aug 2005
    Location
    Pittsburgh, PA
    My Bikes
    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
    Posts
    24,794
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    If the old chain was that badly "stretched" it could have worn the most-used cogs pretty quickly.

  4. #4
    me have long head tube TallRider's Avatar
    Join Date
    Oct 2005
    Location
    Chapel Hill, NC
    Posts
    4,088
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by HillRider View Post
    If the old chain was that badly "stretched" it could have worn the most-used cogs pretty quickly.
    exactly. when a cassette is worn enough to warrant replacing, it's usually worth replacing the chain at that time too.

    edit: sorry, I missed the part where you said "new bike" so the chain was new, too. I was thinking the chain was old (and probably already stretched) and the cassette was replaced 900 miles ago.
    Last edited by TallRider; 10-13-08 at 08:46 AM.

  5. #5
    Senior Member thomson's Avatar
    Join Date
    Dec 2003
    Posts
    3,332
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    900 miles seems like too quick a lifespan for a chain let alone a cassette. Any ideas on why the chain would have excessive gap between pins in only 900 miles?

  6. #6
    L T X B O M P F A N S R apricissimus's Avatar
    Join Date
    Jun 2008
    Location
    Melrose, MA
    My Bikes
    Bianchi Volpe, Bianchi San Jose, Redline 925
    Posts
    2,226
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Yikes. I never thought that 900 miles would damage my drive train so badly. Who the heck are these people I see on BF who say they go 4000 miles or more without changing the chain?

    So, if I replace the cassette, am I going to have to change the chain more frequently in the future? I thought I was cleaning and lubing the chain fairly regularly. Wipe down and lube at least weekly, more thorough cleaning with a degreaser at least monthly.

  7. #7
    L T X B O M P F A N S R apricissimus's Avatar
    Join Date
    Jun 2008
    Location
    Melrose, MA
    My Bikes
    Bianchi Volpe, Bianchi San Jose, Redline 925
    Posts
    2,226
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by thomson View Post
    900 miles seems like too quick a lifespan for a chain let alone a cassette. Any ideas on why the chain would have excessive gap between pins in only 900 miles?
    I don't know why.

    Every time I've replaced a chain on other bikes, I've seen similar stretch, but I don't know how many miles they had on them. (The new bike I bought in May was the first one that I've used a computer with.) Even with similar stretch on other chains, I haven't had the kind of slipping that I'm experiencing with the new bike.

  8. #8
    L T X B O M P F A N S R apricissimus's Avatar
    Join Date
    Jun 2008
    Location
    Melrose, MA
    My Bikes
    Bianchi Volpe, Bianchi San Jose, Redline 925
    Posts
    2,226
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    And just so we're clear, the 1/16 to 1/8 inch stretch is over the entire 112 link chain.

  9. #9
    Senior Member thomson's Avatar
    Join Date
    Dec 2003
    Posts
    3,332
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by apricissimus View Post
    And just so we're clear, the 1/16 to 1/8 inch stretch is over the entire 112 link chain.
    The entire chain is 56.125"? or are you saying that you got the same excess 1/8" over various 12 sections around the chain?

  10. #10
    Senior Member
    Join Date
    Aug 2005
    Location
    Pittsburgh, PA
    My Bikes
    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
    Posts
    24,794
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by apricissimus View Post
    And just so we're clear, the 1/16 to 1/8 inch stretch is over the entire 112 link chain.
    OK, that isn't very much. Normally chain elongation is reported over a 12" (24 half-links) section and 1/8" is way too much. If you chain is elongated only 1/8" over its entire length then either the cogs were defective or something else is going on.

  11. #11
    Senior Member
    Join Date
    Feb 2005
    Location
    No Va but ride also in So Md
    My Bikes
    Cervelo SLC-SL, Guru Photon, Waterford, Specialized CX
    Posts
    7,991
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    If your two "worn" cogs are in the middle of the cassette, check to see if your cable is stretched. Often missed shifts and noise from mid range gears are di to cable stretch. 900 miles is right for cable stretch but not chain stretch to the point where gears are worn
    You're just trying to start an argument to show how smart you are.

  12. #12
    L T X B O M P F A N S R apricissimus's Avatar
    Join Date
    Jun 2008
    Location
    Melrose, MA
    My Bikes
    Bianchi Volpe, Bianchi San Jose, Redline 925
    Posts
    2,226
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by StanSeven View Post
    If your two "worn" cogs are in the middle of the cassette, check to see if your cable is stretched. Often missed shifts and noise from mid range gears are di to cable stretch. 900 miles is right for cable stretch but not chain stretch to the point where gears are worn
    Indeed they are in the middle of the cassette. I'll give that a look. Thanks.

  13. #13
    L T X B O M P F A N S R apricissimus's Avatar
    Join Date
    Jun 2008
    Location
    Melrose, MA
    My Bikes
    Bianchi Volpe, Bianchi San Jose, Redline 925
    Posts
    2,226
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by thomson View Post
    The entire chain is 56.125"? or are you saying that you got the same excess 1/8" over various 12 sections around the chain?
    I'm saying that the entire chain is 56.125".

  14. #14
    Senior Member thomson's Avatar
    Join Date
    Dec 2003
    Posts
    3,332
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by apricissimus View Post
    I'm saying that the entire chain is 56.125".
    Ahh OK, that is not unreasonable wear after 900 miles. I would not have replaced it.

    But, that is no longer the issue. You have two gears that slip. I think Stan's suggestion is the proper next step.

  15. #15
    Bill
    Join Date
    May 2007
    Location
    HIGHLANDS RANCH, CO
    My Bikes
    Specialized Globe Sport, Specialized Stumpjumper FSR Pro
    Posts
    630
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Chains and cassettes wear. It's a fact that can only be avoided by not riding the bike. The key is to minimize it by keeping the chain clean and well lubricated and that's a topic the forum search function will provide you enough opinion on to prevent chain wear forever (cuz you will read til you die and therefore not be riding your bike and wearing things out). If it's clean, lubricated and adjusted properly it will all last longer and run and shift smoothly. My current chain is approaching 3000 miles. My chain wear indicator shows less than 0.75% wear and it runs and shifts smooth and quiet, but at a price - regular care and maintenance (read - kept clean, lubricated and adjusted).
    [SIGPIC][/SIGPIC]
    Eventually you will reach a point when you stop lying about your age and start bragging about it. - Will Rogers

  16. #16
    Senior Member
    Join Date
    Apr 2006
    Posts
    1,024
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    If the teeth on the cogs are not worn to sharp points, then try to adjust the shifter cable with the adjustment screw.

    I use cheap chains and only get about 500 miles before they need replacing. I get 1/16" wear over a 12" section of chain.

  17. #17
    Senior Member
    Join Date
    Sep 2008
    Location
    Northern, CA Save Our Potholes!
    My Bikes
    Varies
    Posts
    95
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by wmodavis View Post
    The key is to minimize it by keeping the chain clean and well lubricated and that's a topic the forum search function will provide you enough opinion on to prevent chain wear forever (cuz you will read til you die and therefore not be riding your bike and wearing things out).
    Yes! Not that I want to start trouble, but if you want to hear an argument in a bike shop, just ask what the best way to clean a chain is. Or, state authoritatively that one oil/wax/lube is the best!

    Very funny!

  18. #18
    L T X B O M P F A N S R apricissimus's Avatar
    Join Date
    Jun 2008
    Location
    Melrose, MA
    My Bikes
    Bianchi Volpe, Bianchi San Jose, Redline 925
    Posts
    2,226
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by jim p View Post
    If the teeth on the cogs are not worn to sharp points, then try to adjust the shifter cable with the adjustment screw.
    Forgive me for asking a stupid question... Is this to increase the overall tension on the chain?

    (I'm an ignoramus about bike maintenance, but I'm learning... slowly.)

Posting Permissions

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