Advertise on Bikeforums.net



User Tag List

Results 1 to 16 of 16
  1. #1
    Member
    Join Date
    Sep 2005
    Posts
    33
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Rear Sprocket Noise...Chainline?

    i built up my beautiful new fixed gear bike with new iro wheels and new shimano cranks / bottom bracket. i bought all the parts with a 42mm chainline in mind so as to avoid any nasty problems with spacers and what-have-you. but... I'm getting some noise from the rear sprocket as the chain passes. From reading previous posts i would assume this is a chainline problem but i'm fairly confident that its pretty dead on straight. is there anything else that can cause this?

  2. #2
    legalize bikes
    Join Date
    May 2003
    Location
    bucks county, PA
    My Bikes
    too damn many
    Posts
    1,250
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    some chains are noisier. ive found that izumi chains make some noise....

  3. #3
    Member
    Join Date
    Sep 2005
    Posts
    33
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    its an sram chain on a soma cog. both are 3/32. is it just this combo that's producing this noise?

  4. #4
    anarchy burger skelly's Avatar
    Join Date
    Jul 2005
    Posts
    969
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Maybe it's gotta break in a bit. I put a new chain on a few weeks ago and it was noisier than my rusty 10-speed beater with loose spokes and banged up wheel. But after a week or so it got less and less noisy and now I can't even hear it.

  5. #5
    blacksheep the blemish
    Join Date
    Nov 2004
    Location
    Portland/Greendale
    My Bikes
    1973 Schwinn World Voyageur (manufactured by panasonic), Italvega Super Speciale (fixed, primary ride now), Kona 2004 JTS 10 spd
    Posts
    1,063
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I've never been able to not have noise when putting on back pressure. It's pretty darn silent when cruising along though.

  6. #6
    Member
    Join Date
    Sep 2005
    Posts
    33
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    yeah, noise occurs when just spinning the wheel by hand. back pressure noise i would expect; my other fixie is silent crusing. i built that one up with a used chain though so maybe i just have to break this one in. chainline "issues" have me so paranoid...unless anyone thinks different i guess i'll just wait it out.

  7. #7
    If you don't look good... benk0's Avatar
    Join Date
    Aug 2005
    Location
    PHX
    My Bikes
    1993 Cannondale Track
    Posts
    284
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Too much tension on the chain maybe?

  8. #8
    Member
    Join Date
    Sep 2005
    Posts
    33
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    nah, the tension is great i've tried it at all extremes tension-wise, so i've ruled that out.

  9. #9
    Member
    Join Date
    Sep 2005
    Posts
    33
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    wait...

    to be more clear, the noise persists at tensions that are way too lose and tensions that way too tight (as to restrict drive train movement). ruling out all these annoyingly technical factors seems to be too easy to be true but is it possible just to noisely break in a new chain in [especially in an intense drive train situation (ie. 14 x 42 fixed gear) ]?

  10. #10
    legalize bikes
    Join Date
    May 2003
    Location
    bucks county, PA
    My Bikes
    too damn many
    Posts
    1,250
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    ive found that SRAM chain are pretty quiet... how do you go about gauging your chainline? if you think it is spot on, then its probably pretty good. 1mm off chainline wont kill you, some drivetrains are just noisier.

  11. #11
    some dude jayrooney's Avatar
    Join Date
    Apr 2005
    Location
    NYC
    Posts
    797
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    is the noise constant, or does it go quiet, noisy, quiet, noisy, etc. as the chain goes around?

  12. #12
    Make it a Single Speed! wasabiboys's Avatar
    Join Date
    Apr 2005
    Posts
    292
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    are there any spots in the chain that are like sticking or something. Also how correct is the alignment of the chain..even a slight off can do wacko stuff. Condition of Freewheel, chainring?

  13. #13
    Lurker for Life yonderboy's Avatar
    Join Date
    Nov 2004
    Location
    PDX
    Posts
    908
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Your chain is always going to be noisy if you're just spinning it on the stand. There's going to be some extra chatter with a new cog and chain while they break-in to each other.

    Just oil it up and ride it. The noise should be barely noticable above all the wind noise, anyway.

  14. #14
    anarchy burger skelly's Avatar
    Join Date
    Jul 2005
    Posts
    969
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by jamesblahblah
    but is it possible just to noisely break in a new chain in [especially in an intense drive train situation (ie. 14 x 42 fixed gear) ]?
    I have 41x14. it was noisy as hell at first both looser or tighter. just took a few weeks and then i couldn't hear it.

  15. #15
    downtube shifter Jose R's Avatar
    Join Date
    May 2004
    Location
    NYC
    My Bikes
    Custom DeanUSA El Diente CTI, Andante Track
    Posts
    561
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Usually, people clean up a new chain with a degreaser and then re-lube the chain with the lube of their choice.

    In most cases chain noise is lube related, not necessarily chainline related.

    BTW, wrt chainline, the target is 42.5. But, most modern hubs, cogs combinations will give you 42.75-43.75 or thereabouts. Which is why people like adjustable BBs. From Business Cycles:


  16. #16
    Banned.
    Join Date
    Oct 2004
    Posts
    4,418
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Oil your chain. I reccomend a wet lube, such as triflow or finish line cross country.

Posting Permissions

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