Results 1 to 8 of 8

Thread: Chain Skipping

  1. #1
    MoJo Neophyte damnitjim's Avatar
    Join Date
    Aug 2001
    Location
    San Antonio, TX
    Posts
    29

    Chain Skipping

    Hi, I am having a problem with my chain skipping under load. It happens when in the middle chain ring and high gears 6-7. The cassette and chain do not appear to be worn (no shark teeth!). Tried cleaning the cassette, chain, and chain rings. Also made sure no links were stiff. Help! Any methodical procedure would be appreciated before I attempt my tried and true method: replace parts until it goes away! TIA

  2. #2
    try explaining the internet to a bum!
    MoJo SuppoRteR
    carlos's Avatar
    Join Date
    May 2001
    Location
    southside, chico!
    Posts
    9,705
    hmmm...

    good thing you got the wear issue all squared away.

    how old is the bike?

    are the chain, cassette, AND rings all about the same age...in months? about 1000 miles is the limit or about 1 year.

    how old are the cables AND housing? 1 year is usually too long.

    -check the housing for kinks or damage
    -check the ferrules if you're using Shimano brand housing.
    -check for a bent hanger.
    -check the freehub. see if there is any play in the cassette while the rear wheel is still.
    -check the crank bolts to make sure they are tight
    -if possible...make sure the driveside cup isn't unthreading. that'll mess with the chain line. long shot and not usually cause for skipping but worth a look.
    -kinked cable...this is usually right near a ferrule or just inside of a ferrule.
    -check for a missing or bent tooth on the middle ring.
    -make sure the wheel is fully seated in the dropout and the QR is tight.

    if you need a photo or further info on any of these....post up.


    by the way....nice bike.

  3. #3
    MoJo Neophyte damnitjim's Avatar
    Join Date
    Aug 2001
    Location
    San Antonio, TX
    Posts
    29
    The bike is about 2 year old Santa Cruz Superlight [need to add it to my profile!]. The drivetrain is about 9 months old (frame build up), with mostly weekend warrior duty. When I did the build up the chain rings and cassette were lightly used and a new chain was installed. Didn't have any problems up until a month ago. I'll run thru your checklist, is there any easy way to check for a bent derailleur besides just eyeballing it and not using the derailleur alignment tool thingy?

  4. #4
    try explaining the internet to a bum!
    MoJo SuppoRteR
    carlos's Avatar
    Join Date
    May 2001
    Location
    southside, chico!
    Posts
    9,705
    lightly used chainrings and cassette mixed with a new chain could be the problem. and it usually doesn't happen right away...if it happens at all.

    consider replacing the middle ring. the cassette could stand some more use though.

    as for checking for a bent hanger without tools...it's not easy. but look at the cage when the chain is shifted to the largest cog. the der cage should be parallel with the largest cog.

  5. #5
    MoJo Neophyte damnitjim's Avatar
    Join Date
    Aug 2001
    Location
    San Antonio, TX
    Posts
    29
    -check the housing for kinks or damage
    OK
    -check the ferrules if you're using Shimano brand housing.
    OK
    -check for a bent hanger.
    Visually looks OK
    -check the freehub. see if there is any play in the cassette while the rear wheel is still.
    Some play, compared it to another wheel.
    -check the crank bolts to make sure they are tight
    OK
    -if possible...make sure the driveside cup isn't unthreading. that'll mess with the chain line. long shot and not usually cause for skipping but worth a look.
    OK
    -kinked cable...this is usually right near a ferrule or just inside
    of a ferrule.
    Slightly out of alignment cable housing, maybe need to shorten slightly. See pic.

    -check for a missing or bent tooth on the middle ring.
    -make sure the wheel is fully seated in the dropout and the QR is tight.

  6. #6
    MoJo Neophyte damnitjim's Avatar
    Join Date
    Aug 2001
    Location
    San Antonio, TX
    Posts
    29
    Pic
    Attached Images Attached Images  

  7. #7
    MoJo Neophyte damnitjim's Avatar
    Join Date
    Aug 2001
    Location
    San Antonio, TX
    Posts
    29
    Another pic
    Attached Images Attached Images  

  8. #8
    try explaining the internet to a bum!
    MoJo SuppoRteR
    carlos's Avatar
    Join Date
    May 2001
    Location
    southside, chico!
    Posts
    9,705
    that's a possibility......try this.

    turn the cranks and move the chain the the middle chain ring.

    turn the cranks and shift the chain the the largest cog.

    without turning the cranks or the rear wheel, pull the index finger trigger on your right hand shifter while tugging the exposed cable near the water bottle cage. pull the trigger until there are no more clicks.

    now there is enough slack in the cable that you can slip the housing out of the stops.

    see how freely the housing moves over the cable.

    iif there is any noticable drag...the housing might be worn out. in that case...reaplce either that piece....or for peace of mind, replace it all.

    this will also allow you to see the bit of cable inside the housing right where the kinked housing appears.

    if there is no kink then you can slip all the housing back into the stops.

    let me knwo if you find anything because the last thing there would be to check is the tuning and that will require a photo or two.

    as for the kinked housing...you could trim it a bit...that wouldn't hurt....but so long as the cable doesn't drag on the opening of the ferrule....you're ok.

Remove Ads

Search tags for this page (caching method: table)

There are currently no search engine referrals.
Click on a term to search our site for related topics.

Bookmarks

Posting Permissions

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