Advertise on Bikeforums.net



User Tag List

Results 1 to 15 of 15
  1. #1
    Senior Member gman26's Avatar
    Join Date
    Oct 2008
    Location
    The Greater OC.
    Posts
    234
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    question about removing octalink crank arms

    Do you need a gear puller? I removed the retaining bolts, but they're stuck on there. It's a specialized rockhopper 29.

  2. #2
    Insane Bicycle Mechanic Jeff Wills's Avatar
    Join Date
    Mar 2008
    Location
    other Vancouver
    Posts
    6,774
    Mentioned
    16 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by gman26 View Post
    Do you need a gear puller? I removed the retaining bolts, but they're stuck on there. It's a specialized rockhopper 29.
    You need the correct crank puller. Read on: http://parktool.com/repair/readhowto.asp?id=120
    Jeff Wills

    All my bikes.

  3. #3
    Senior Member gman26's Avatar
    Join Date
    Oct 2008
    Location
    The Greater OC.
    Posts
    234
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Mission accomplished! My local REI store had the tool and the mechanic was nice enough to remove the bottom bracket for free.
    I love REI!

  4. #4
    Senior Member MudPie's Avatar
    Join Date
    May 2004
    Location
    Southern California
    Posts
    1,874
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by gman26 View Post
    Mission accomplished! My local REI store had the tool and the mechanic was nice enough to remove the bottom bracket for free.
    I love REI!
    What?!?! You missed an opportunity to buy a new tool!

  5. #5
    Senior Member gman26's Avatar
    Join Date
    Oct 2008
    Location
    The Greater OC.
    Posts
    234
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by MudPie View Post
    What?!?! You missed an opportunity to buy a new tool!
    I did buy the crank arm tool.

  6. #6
    biked well well biked's Avatar
    Join Date
    Jul 2005
    Posts
    6,814
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    My Octalink cranks have always had self extracting rings; all you have to do with these, with the self extractors in place, is unscrew the bolt and the crankarm will back off the spindle.
    Last edited by well biked; 09-11-10 at 09:08 PM.

  7. #7
    Senior Member MudPie's Avatar
    Join Date
    May 2004
    Location
    Southern California
    Posts
    1,874
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by gman26 View Post
    I did buy the crank arm tool.
    Whew, all is right in the world nowl. I misread your post - thought REI mechanic had the right tool and took the arms off for you.

  8. #8
    Kip
    Kip is offline
    Senior Member Kip's Avatar
    Join Date
    Sep 2009
    Posts
    193
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by well biked View Post
    My Octalink cranks have always had self extracting rings; all you have to do with these, with the self extractors in place, is unscrew the bolt and the crankarm will back off the spindle.
    I don't have this on my Octalink cranks. Can these self-extracting rings be retrofitted into what I have? It would make it easier to break down my bicycle for shipping when I tour.

  9. #9
    Senior Member
    Join Date
    Sep 2004
    Location
    boston, ma
    Posts
    2,816
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    crank usually dont need to be removed for shipping but you can install self extracting caps from various manufactures

  10. #10
    Insane Bicycle Mechanic Jeff Wills's Avatar
    Join Date
    Mar 2008
    Location
    other Vancouver
    Posts
    6,774
    Mentioned
    16 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Kip View Post
    I don't have this on my Octalink cranks. Can these self-extracting rings be retrofitted into what I have? It would make it easier to break down my bicycle for shipping when I tour.
    Yes they can, but the issue with "self-extracting" crankarm bolts is that people rarely tighten them enough. Once the crankarm gets loose and the machining at the spindle interface gets boogered, it's all over. You have to replace the crankarm.

    In general, most people don't remove the cranks when shipping a bike. Taking off the pedals is all that's needed.
    Jeff Wills

    All my bikes.

  11. #11
    Kip
    Kip is offline
    Senior Member Kip's Avatar
    Join Date
    Sep 2009
    Posts
    193
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks for the information and cautionary note about the "self-extracting" crankarm bolts. I've never had to remove the cranks for shipping but I now have a bike with S & S couplings and am experimenting with how to pack it as compact as possible.

  12. #12
    biked well well biked's Avatar
    Join Date
    Jul 2005
    Posts
    6,814
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Jeff Wills View Post
    ....... the issue with "self-extracting" crankarm bolts is that people rarely tighten them enough. Once the crankarm gets loose and the machining at the spindle interface gets boogered, it's all over. You have to replace the crankarm........
    I've never had any problems with Octalink self-extracting cranks, I'm not getting what you're saying. The extractor ring is a a separate piece from the crank bolt; it needs to be snugged down against the crank bolt. How does the self-extracting feature have any affect on how tight you tighten the crank bolt?


  13. #13
    Senior Member
    Join Date
    Nov 2008
    Location
    Bay Area, Calif.
    Posts
    4,820
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Jeff Wills View Post
    Yes they can, but the issue with "self-extracting" crankarm bolts is that people rarely tighten them enough. Once the crankarm gets loose and the machining at the spindle interface gets boogered, it's all over. You have to replace the crankarm.
    My bikes don't have Octalink cranks, but one of them is my travel bike that requires removal of the crankarm to fit inside a regular suitcase. It has a self-extracting bolt on a regular square-taper crank and that's been used dozens of times when packing the bike. I don't really see why the self-extracting nature of it has anything to do with how tight I get it when reinstalling the crank. I'd use the same torque when tightening it regardless of whether I used a separate extractor tool to take it off or used the self-extracting bolt - but the latter certainly makes it quicker and more convenient to take the crank off when packing the bike.

  14. #14
    Insane Bicycle Mechanic Jeff Wills's Avatar
    Join Date
    Mar 2008
    Location
    other Vancouver
    Posts
    6,774
    Mentioned
    16 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by well biked View Post
    I've never had any problems with Octalink self-extracting cranks, I'm not getting what you're saying. The extractor ring is a a separate piece from the crank bolt; it needs to be snugged down against the crank bolt. How does the self-extracting feature have any affect on how tight you tighten the crank bolt?
    The typical 8mm hex (Allen) wrench is 6 to 8 inches long. It's tough to generate the required 25 to 35 foot-pounds of torque that is required with that short of a wrench. The self-extracting feature isn't really the problem, but it necessitates the hex (Allen) bolt. This makes people believe that simply hand-tightening the bolt will secure the crank when it doesn't.
    Jeff Wills

    All my bikes.

  15. #15
    John Wayne Toilet Paper nhluhr's Avatar
    Join Date
    Feb 2006
    Location
    Seattle
    My Bikes
    BH G5
    Posts
    1,867
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by well biked View Post
    I've never had any problems with Octalink self-extracting cranks, I'm not getting what you're saying. The extractor ring is a a separate piece from the crank bolt; it needs to be snugged down against the crank bolt. How does the self-extracting feature have any affect on how tight you tighten the crank bolt?

    I think he means if you don't screw in the self-extractor far enough and try to pull a crank-arm, you will strip the threads in the crank and then you won't be able to remove the crank easily. But that goes for using any kind of threaded extractor. A mechanical dolt will quickly ruin anything.

Posting Permissions

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