Results 1 to 14 of 14
  1. #1
    mtbr member
    Reputation:
    Join Date
    May 2011
    Posts
    42

    Do worn rear derailleur pulleys wear out your chain ?

    just recently installed new chain cassette and chain rings, wanted to know if i need to also replace the derailleur pulleys, they're not totally pointy but on their way and probably need replacing. my shiftings fine, no complaints, no noise... Do I even need to replace the pulleys or do they not affect chain wear?
    Last edited by isignay; 12-12-2012 at 06:11 PM. Reason: typo

  2. #2
    Fat-tired Roadie
    Reputation: AndrwSwitch's Avatar
    Join Date
    Nov 2007
    Posts
    12,313
    They're typically a resin material. I wouldn't worry about it. You can run into trouble if the teeth are so worn down that the chain drags across the pulley instead of turning it.
    "Don't buy upgrades; ride up grades." -Eddy Merckx

  3. #3
    Front Range, Colorado
    Reputation: DIRTJUNKIE's Avatar
    Join Date
    Oct 2000
    Posts
    13,779
    No they don't have to be replaced when you change out front rings and cassette. They just act as a guide for the chain. All the pressure that the chain gets is from the rings and cassette. Don't worry about them unless they are broken which is unlikely.
    --------- __o
    ------- _`\<,_
    ------ (*)/ (*)
    ************^^^^^^^^^Rock Garden

  4. #4
    mtbr member
    Reputation: carverboy's Avatar
    Join Date
    Sep 2009
    Posts
    531
    So I should be okay with this one?
    Attached Thumbnails Attached Thumbnails Do worn rear derailleur pulleys wear out your chain ?-photo-3-.jpg  


  5. #5
    Front Range, Colorado
    Reputation: DIRTJUNKIE's Avatar
    Join Date
    Oct 2000
    Posts
    13,779
    That's looking pretty beat and ready to be changed. It won't hurt your chain to run it. But you have all new rings and cassette you could use a change out of those as well. But if you don't they work fine with zero effect on wear of the chain. Like I said earlier they just act as a guide for the chain. It's up to you but now that it's on your mind you probably should get new ones. Otherwise it will constantly be in your mind like you should have.
    --------- __o
    ------- _`\<,_
    ------ (*)/ (*)
    ************^^^^^^^^^Rock Garden

  6. #6
    mtbr member
    Reputation: Pollution Warrior's Avatar
    Join Date
    Apr 2010
    Posts
    385
    That pic looks like pics I've seen of worn pulleys. I'd replace them. Can't cost much.

  7. #7
    mtbr member
    Reputation:
    Join Date
    Sep 2006
    Posts
    226
    Quote Originally Posted by Pollution Warrior View Post
    That pic looks like pics I've seen of worn pulleys. I'd replace them. Can't cost much.
    And you would be wrong if you are looking for a OE part.

    Shimano XTR M970-M972 Derailluer Pulley Set


    The aftermarket alloy pulleys are noisy.

  8. #8
    mtbr member
    Reputation: sasquatch rides a SS's Avatar
    Join Date
    Dec 2010
    Posts
    4,626
    I've had good luck with the blingy alloy pulleys. I was going to suggest them, actually. All you really get is bling-factor, though.
    Mountain bikers who don't road ride have no legs...
    Road riders who don't mountain bike have no soul...

  9. #9
    mtbr member
    Reputation:
    Join Date
    Jun 2012
    Posts
    782
    $50 for pulley's, what a rip off.

  10. #10
    mtbr member
    Reputation:
    Join Date
    May 2006
    Posts
    10,971
    Quote Originally Posted by isignay View Post
    just recently installed new chain cassette and chain rings, wanted to know if i need to also replace the derailleur pulleys, they're not totally pointy but on their way and probably need replacing. my shiftings fine, no complaints, no noise... Do I even need to replace the pulleys or do they not affect chain wear?
    Worn jockey wheels will wobble and have side to side play....

    This when bad will cause slow and poor shifting.....

    This in turn will wear a chain out, that will then wear out the cassette and rings.

    I have run will over 20,000km on a set of jockey pulleys without problems.

  11. #11
    mtbr member
    Reputation: Wombat's Avatar
    Join Date
    Jan 2004
    Posts
    1,750
    After replacing the drive train in the past I've then had to get new jockey wheels to get it to run properly. The ones I replaced looked like the ones you show.

    Tim
    Last edited by Wombat; 12-13-2012 at 12:48 PM.

  12. #12
    Ride Instigator
    Reputation: Ricko's Avatar
    Join Date
    Jan 2004
    Posts
    2,976
    Quote Originally Posted by Learux View Post
    $50 for pulley's, what a rip off.
    ....Exactly. I'd pop for a few more bucks and just pick up a new rear derailleur.

  13. #13
    Front Range, Colorado
    Reputation: DIRTJUNKIE's Avatar
    Join Date
    Oct 2000
    Posts
    13,779
    Quote Originally Posted by sasquatch rides a SS View Post
    I've had good luck with the blingy alloy pulleys. I was going to suggest them, actually. All you really get is bling-factor, though.
    Squatch, Tell me again how often you are replacing these jockey wheels while riding a single speed.
    --------- __o
    ------- _`\<,_
    ------ (*)/ (*)
    ************^^^^^^^^^Rock Garden

  14. #14
    mtbr member
    Reputation:
    Join Date
    May 2011
    Posts
    869
    Bike shops usually have bent derailleurs laying around. If you're lucky, they'll let you pull some pulleys off one of those for free or little cost. My sram x.9 10sp has two 105 road derailleur pulleys on it as the stupid sram ones have cutouts that allowed them to easily break. Works great now.

Posting Permissions

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