Advertise on Bikeforums.net



User Tag List

Results 1 to 13 of 13
  1. #1
    Senior Member
    Join Date
    Apr 2003
    Posts
    134
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Inner chain ring removal help please

    I have a busted inner chain ring on my mountain bike...I am assuming I need a crank removal wrench to get to it, right?

    There are several types I have seen...which one do I need to get?

    Attached are some pictures. Also while I am down there should I repack the bottom bracket?

    100_0505.jpg100_0509.jpg

    thanks
    '04 Canondale R3000
    "00 Trek 8500
    "74 Raleigh Gran Sport

  2. #2
    30 YR Wrench BikeWise1's Avatar
    Join Date
    Aug 2005
    Location
    Oxford, OH
    My Bikes
    Waterford R-33, Madone 6.5, Trek 520
    Posts
    2,003
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Well, I would certainly pull the crank. The BB is probably sealed, so no repacking possible. If is it loose, or doesn't spin smoothly, replace it.

    Remove the 8MM allen bolt, and if you see a square axle in there, insert standard threaded crank extractor, remove crank. If the BB axle is not square, you will need a different extractor for Octalink. I have heard of folks using a penny along with a standard extractor for Octalink, but have never had to do that. For the BB, you need the tool appropriate to the brand of BB- probably Shimano- and a big wrench.
    Last edited by BikeWise1; 03-25-11 at 09:52 AM.

  3. #3
    You Know!? For Kids! jsharr's Avatar
    Join Date
    Apr 2005
    Location
    Just NW of Richardson Bike Mart
    My Bikes
    '05 Trek 1200 / '90 Trek 8000 / '? Falcon Europa
    Posts
    6,117
    Mentioned
    12 Post(s)
    Tagged
    3 Thread(s)
    I am almost positive that is going to be a square taper bottom bracket. Should be able to remove the allen headed fastener and used a standard square taper crank puller.

    http://www.nashbar.com/bikes/Product...8_10000_202573
    Are you a registered member? Why not? Click here to register. It's free and only takes 27 seconds! Help out the forums, abide by our community guidelines.
    Quote Originally Posted by colorider View Post
    Phobias are for irrational fears. Fear of junk ripping badgers is perfectly rational. Those things are nasty.

  4. #4
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    3,408
    Mentioned
    50 Post(s)
    Tagged
    0 Thread(s)
    I'm guessing Octalink. the right arm appears to be of the spline connected spider 3 piece type.
    arm-spider-lockring.. I have a version from US maker AC, that is what they sought to be compatible with.

  5. #5
    Senior Member Shimagnolo's Avatar
    Join Date
    May 2008
    Location
    Zang's Spur, CO
    Posts
    6,471
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I have that exact crankset on my mtn bike.
    You need a standard crank extractor.
    The BB is the standard square taper cartridge.

  6. #6
    Senior Member
    Join Date
    Apr 2003
    Posts
    134
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    ok...just to understand it all, what is Octalink and how is that different than a standard square taper.

    I am pretty adept at figuring things out, but I like to understand it all before I proceed...so how exactly then does onee use the crank extractor?

    thanks
    '04 Canondale R3000
    "00 Trek 8500
    "74 Raleigh Gran Sport

  7. #7
    Senior Member Shimagnolo's Avatar
    Join Date
    May 2008
    Location
    Zang's Spur, CO
    Posts
    6,471
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Back out that hex bolt you see in the center of the crank.
    Thread in the extractor.
    Crank the handle of the extractor to push it's center post into the spindle, and the crank arm comes off.

    Forget about Octalink; You don't have it.

  8. #8
    Bikaholic blamp28's Avatar
    Join Date
    Dec 2006
    Location
    Western, Michigan
    My Bikes
    Trek Fuel 90, Giant OCR, Rans Screamer Tandem
    Posts
    1,467
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Take a look at these but yours is most likely square taper. as noted above, you can tell for sure by removing the 8mm crank bolt. This was at Sheldon's web site. Bookmark it as a great source if information. http://www.sheldonbrown.com/gloss_n-o.html
    Trek Fuel XC MTB, Giant OCR Road Bike, Rans Screamer - Tandem

  9. #9
    Senior Member
    Join Date
    Feb 2009
    Posts
    4,151
    Mentioned
    5 Post(s)
    Tagged
    0 Thread(s)
    http://www.parktool.com/product/univ...d-cranks-CWP-7
    http://www.parktool.com/product/bott...et-tool-BBT-22
    There is a tool to change out the chain ring spider, but I don't remember which one does it. I doubt that you could get the other spider anyway.

  10. #10
    Bikaholic blamp28's Avatar
    Join Date
    Dec 2006
    Location
    Western, Michigan
    My Bikes
    Trek Fuel 90, Giant OCR, Rans Screamer Tandem
    Posts
    1,467
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    That one is called a Chainring Nut Wrench park CNW-2 http://www.jensonusa.com/store/produ...h.aspx?sc=FRGL
    Trek Fuel XC MTB, Giant OCR Road Bike, Rans Screamer - Tandem

  11. #11
    Senior Member
    Join Date
    Feb 2009
    Posts
    4,151
    Mentioned
    5 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by blamp28 View Post
    That one is called a Chainring Nut Wrench park CNW-2 http://www.jensonusa.com/store/produ...h.aspx?sc=FRGL
    The spider that holds the chainrings is removable on that crank. You can use either the 4 bolt shown or a 5 arm spider with the 94 and 58mm bolt circle diameter rings.
    This tool fits the spider lock ring: The http://www.parktool.com/product/bott...et-tool-BBT-18 It is used with this piece to hold it in place: http://store.icyclesusa.com/shimano-...ool-p1199.aspx
    Last edited by davidad; 03-25-11 at 01:18 PM.

  12. #12
    Senior Member
    Join Date
    Apr 2003
    Posts
    134
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    so I thought that the inner chainring would just unbolt...do I need that spider removal tool to remove the inner chainring?
    '04 Canondale R3000
    "00 Trek 8500
    "74 Raleigh Gran Sport

  13. #13
    Senior Member Shimagnolo's Avatar
    Join Date
    May 2008
    Location
    Zang's Spur, CO
    Posts
    6,471
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by blaine View Post
    so I thought that the inner chainring would just unbolt...do I need that spider removal tool to remove the inner chainring?
    No

Posting Permissions

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