Advertise on Bikeforums.net



User Tag List

Results 1 to 4 of 4
  1. #1
    Senior Member
    Join Date
    Jan 2010
    Posts
    71
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Octalink crank arm splines stripped

    I have a used Specialized Allez bike. I believe the crankset is a Shimano 105 Octalink v1 double (rebranded with Specialized logos). While riding today, my right foot pushed down, but my left foot did not rise correspondingly. Pulling out the crank arms, I notice the drive side splines were full of aluminum fragments. The BB spindle, however, looked just fine.

    Of course, I'll have to replace it. But I'm curious, is stripping the splines off Octalink v1 cranksets typical? I don't really want to buy another crankset just to have this happen again. Or did I likely do something wrong? Put too much torque on the pedals? Overtightened the crank bolt? I'm not sure what could have caused this.

    The alternative is changing the BB to another system. I'm tempted to go back to square taper since they are cheap and have been fairly reliable for me.

  2. #2
    Senior Member
    Join Date
    Apr 2009
    Location
    New Rochelle, NY
    My Bikes
    too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
    Posts
    20,753
    Mentioned
    46 Post(s)
    Tagged
    1 Thread(s)
    This type of failure is very rare. I doubt it had to do with excess torque unless you weight 400#s and stood on a hard climb. My best blind guess is that rather than being overtightened, you were riding it slightly loose for a while and slowly shaving the splines until they let go.
    FB
    Chain-L site

    An ounce of diagnosis is worth a pound of cure.

    “Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

    “One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

    WARNING, I'm from New York. Thin skinned people should maintain safe distance.

  3. #3
    Senior Member mechBgon's Avatar
    Join Date
    Jul 2002
    Posts
    6,957
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Also, your Specialized crankarms wouldn't be made by Shimano. Octalink crank bolts should be very tight, so overtightening them would be quite a feat... I think FB has it, they probably were not tight enough.

    When you get your replacements, make sure the crank bolts are seriously tight. Octalink's designed to swedge on and then bottom, not just swedge until they're "swedged enough" like square taper.

  4. #4
    Senior Member
    Join Date
    Jan 2010
    Posts
    71
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    you're right. they are "Specialized Pro, 39/53 teeth" according to bikepedia:
    http://www.bikepedia.com/quickbike/B...uble&Type=bike

    Ok. I'll look into new octalink crankarms then.

Posting Permissions

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