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  1. #1
    Senior Member
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    Loose NDS Crank Arm

    I got fed up with my crummy FSA Gossamer crank and had my LBS install a new Shimano 105 crank. I'm new to the area and it was the first time I had them do any work.

    Finally took it for a spin this weekend, and there was a noticeable "hitch" in the pedal stroke when my left foot was coming over the top. Rather than stop, I pushed through, thinking that it was just my old cleats popping out of the pedal a bit. I got home and checked things out for real, and I noticed that the non-drive side crank arm was loose as hell. The bolts were not even finger tight -- it looks like the shop guys just forgot to finish the job. I immediately tightened them down to spec (12-14 nm), cleaned and lubed the bike, and hung it back on the wall.

    It was only a 20 mile ride, and I'm in early season (read: bad) shape, but I did do a couple of climbs on it. Any chance I did any damage to the BB shell or anything else down there riding with a loose crank arm like a lunatic? The arm never slipped or came off or anything. Just wondering if I should go back to the shop and have them check it out, or if I avoided disaster by tightening things up after 1 ride.

  2. #2
    Senior Member
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    1990 Romic Reynolds 531, 2009 Giant TCR Advanced custom build, Merlin Works CR Ti custom build
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    Have it checked out.
    Robert

    My hero: "Tar-Baby ain't sayin' nuthin'..." (Joel Chandler Harris, Uncle Remus")

  3. #3
    Senior Member
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    I would go back to the shop and have them check it out for damage. Also, the owner of the store will want to know about the unfinished job. It was a foolish and potentially dangerous oversight.

    Tom

  4. #4
    Senior Member MagicHour's Avatar
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    Post-repair crank arm release. Exact reason I started doing my own mechanical work. It's possible that crank/BB interface is toast.

    Quote Originally Posted by Tpcorr View Post
    I would go back to the shop and have them check it out for damage. Also, the owner of the store will want to know about the unfinished job. It was a foolish and potentially dangerous oversight.

    Tom
    Last edited by MagicHour; 03-31-14 at 01:20 PM.

  5. #5
    Climbing: Ropes or Wheels PiLigand's Avatar
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    From the perspective of a materials scientist and an engineer, I would be surprised if there was any damage to the pieces in question. That being said, from a cyclist's perspective, better safe than sorry. Plus, I'm sure that once you explain the scenario to your LBS, they wouldn't charge you for the inspection. Good catch, btw. Glad nothing went too wrong. I'd love to hear updates on the inspection, too. It would be helpful for future reference.
    Uh oh. I'm looking at Ebay again...

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