noisy 105 groupset

Unknown
Unknown
edited December 1969 in Workshop
Just brought a new bike and the middle chain ring makes a horrible noise. there are what appear to be 4 very small blades connected to the chain ring just below where the chain sits between the teeth; it makes a creaking sort of noise most noticeably twice per peddle revolution, i'm convinced that these blades are causing it. Even on the big and little chain ring the chain is noisy, but doesn't creak. it's a sram chain and the 105 group is the older 9 speed version. anyone got any experience of this and how to shut it up. my old bike has sora on it which provided i clean and lube regularly runs quiet as a mouse, that satisfying whirrrrr...


Wot, get up early and ride to work.... are you mad?

Comments

  • combat_wombat
    combat_wombat Posts: 2,188
    is it a 10 speed chainset + a wider 9 speed chain?

    or is the chain an old one?
    48/19 Winter : 105 Summer
  • Unknown
    Unknown
    it is the 9 speed set and the bike and chain are brand new albeit ex dispay but unridden. the chain is a sram PC68 which on their website says it is compatible with 8 or 9 speed

    windy

    Wot, get up early and ride to work.... are you mad?
  • Unknown
    Unknown
    Quote "makes a creaking sort of noise most noticeably twice per peddle revolution" ...take off pedals, lube threads with copperslip and all should be quiet



    http://i123.photobucket.com/albums/o312 ... siCK5A.jpg
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  • gbb
    gbb Posts: 1,240
    I may be wrong but i thought PC68 was 5 to 8 speed MTB chain....
    PC951, 971 and 991 are more commonly 9 speed roadbike chains. I assume cos youre running Shimano 105, you are riding a roadbike?

    Chill out, fer Christsakes....
    Chill out, fer Christsakes....
  • combat_wombat
    combat_wombat Posts: 2,188
    http://sheldonbrown.com/creaks.html

    lots of possible causes listed here
    48/19 Winter : 105 Summer
  • fossyant
    fossyant Posts: 2,549
    The PC68 is an upto 8 speed - get a specific 9 speed one - it's actually SRAMs top 8 speed chain. Can recommend the KMC x chains, although I've got an 8 speen on my 8 speed Dura-Ace.
  • Unknown
    Unknown
    thanks for your input.

    the Sram website says that the PC68 is for 8 or 9 speed gearing. if i swap it for another chain should i go for a Shimano one to match the group set?

    Windy

    Wot, get up early and ride to work.... are you mad?
  • toontra
    toontra Posts: 1,160
    <blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by WindyRob</i>


    the Sram website says that the PC68 is for 8 or 9 speed gearing.
    <hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

    Well, it's wrong - every other online shop states clearly that the PC68 is 8-speed. If Sram give false info on their site then IMO you would be within your rights to ask for compensation from them for buying the wrong chain and the likely damage that running it may have done to your chainset (depending on how long it's been used).

    there's no such thing as steep hills - just the wrong gear

    a serious case of small cogs
  • Unknown
    Unknown
    Thanks for the help.

    I contacted SJScycles and the guys response was instantly 'Oh shouldn't have been fitted with a PC68 that's an 8 speed, i'll get one in the post for you, that should quiet things down a bit'

    Can't fault that sort of customer service, shame it was shipped with the wrong one in the first place.

    Windy

    Wot, get up early and ride to work.... are you mad?

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