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  1. #1
    rsg
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    Crank Arm constantly comes loose - need a solution to solve problem.

    My left crank arm constantly keep coming loose whenever I use my bike, how can I prevent this from happening??

    What would be a cheap fix? (if any)

    Please reply back.

  2. #2
    Fast+Bulbous thinktubes's Avatar
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    New crank arm or crankset. Yours is toast.

  3. #3
    Bianchi Goddess Bianchigirll's Avatar
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    I agree if the crank is coming lose from the spindle you need a new arm.
    Bianchis '87 Sport SX, '90 Proto, '90 Campione del Fausto Giamondi Specialisma Italiano Mundo, '91 Boarala 'cross, '93 Project 3, '86 Volpe, '97 Ti Megatube, , '90 something Vento 603,

    Others but still loved,; '80 RIGI, '80 Batavus Professional, '87 Cornelo, '09 Motobecane SS, '?? Jane Doe (still on the drawing board), '90ish Haro Escape

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    Take a look at the taper of that left-side crank arm. Does it look worn or widened? If so, it's a goner.

  5. #5
    Senior Member miamijim's Avatar
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    New arm....
    WWW.CYCLESPEUGEOT.COM 2005 Pinarello Dogma; 1991 Paramount PDG 70 Mtb; 1976? AD Vent Noir; 1989 LeMond Maillot Juane F&F; 1993? Basso GAP F&F; 1989 Terry Symmetry; 2003 Trek 4700 Mtb; 1983 Vitus 979

  6. #6
    Gearhead old's'cool's Avatar
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    Crankarm could be cracked at the hub and you're auguring for a rupture if it lets go completely while you're bearing down on the pedal.
    Geoff
    "I think that I think, therefore I think that I am"

  7. #7
    Senior Member Chombi's Avatar
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    +1 on the worn out crank arm..
    It will take a gaggle of loose aluminumm crank arms before you can make the slightest "dents" on the tapers of a steel BB spindle......
    But it still might be good to check that your crank arm bolts and spindle end threads are OK to make sure the are remaining tight when you ride.......
    Last edited by Chombi; 07-11-14 at 07:26 PM.

  8. #8
    billy chuck eschlwc's Avatar
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    have you tried another bolt and washer? i would try a few little things (even blue locktite) before you buy a new arm. but if the arm is a generic one, they can be had for $10. it's the left too (non photo side), so it's not nearly as important.

  9. #9
    rsg
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    Yes it's the left arm that comes loose, just replaced the nut for it & was wondering if adding a washer or lock washer would help?

    The spindle is good, the arm is slightly worn in the back side on one of the flats but the rest is ok. Even my bike shop looked at it said it should hold up.

    Rode the bike yesterday, had the same problem after 45 minutes of riding after I installed the new nut to the arm.

  10. #10
    rsg
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    Quote Originally Posted by rsg View Post
    Yes it's the left arm that comes loose, just replaced the nut for it & was wondering if adding a washer or lock washer would help?

    The spindle is good, the arm is slightly worn in the back side on one of the flats but the rest is ok. Even my bike shop looked at it said it should hold up.

    Rode the bike yesterday, had the same problem after 45 minutes of riding after I installed the new nut to the arm.
    By the way the crank I have is a Sugino Model No. 5 FE-WB. 170 MM arm or 6-3/4" If I need a new arm, what would come close to this if I can't find the exact one? (have looked on E-bay, according to them, this model crank doesn't even exist)

  11. #11
    rsg
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    Quote Originally Posted by rsg View Post
    By the way the crank I have is a Sugino Model No. 5 FE-WB. 170 MM arm or 6-3/4" If I need a new arm, what would come close to this if I can't find the exact one? (have looked on E-bay, according to them, this model crank doesn't even exist)
    Does Sugino even make crank parts for older models?? Would like to keep my bike original if possible??

  12. #12
    Fast+Bulbous thinktubes's Avatar
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    Post a pic. I bet just about everyone on this forum has at least one Sugino crankset floating around in their parts bin.

  13. #13
    Still learning oddjob2's Avatar
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    Quote Originally Posted by rsg View Post
    Does Sugino even make crank parts for older models?? Would like to keep my bike original if possible??
    If there is a bike coop or a craigslist bike flipper near you, they can probably dig a crank up for $5 and a whole crank set for about $15. It doesn't get a whole lot cheaper than that.
    Life is like riding a bicycle. To keep your balance you must keep moving. Albert Einstein
    2014 Additions: 1985 Trek 560, 1992 Trek Multitrack 700 (my 2nd), 1994 Trek Carbon 2200, Peugeot PX-10, 1981 Schwinn Voyageur 11.8, 1989 Bridgestone RB-1, Miyata 912

  14. #14
    rhm
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    multimodal commuter rhm's Avatar
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    Quote Originally Posted by thinktubes View Post
    Post a pic. I bet just about everyone on this forum has at least one Sugino crankset floating around in their parts bin.
    +1

  15. #15
    Senior Member Paramount1973's Avatar
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    You won't easily find an exact replacement but you will be able to find a 170 mm Sugino crank that looks somewhat like your old crank. The cranks are on opposite sides of the bike so it's not like you ever see them facing you at the same time.

  16. #16
    billy chuck eschlwc's Avatar
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    you replaced the nut? not the bolt? do you have one of those spindles that takes nuts and not bolts? i hate those.

  17. #17
    rsg
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    Quote Originally Posted by eschlwc View Post
    you replaced the nut, not the bolt?

    Do you have one of those spindles that takes nuts and not bolts?

    Yes, mine uses a 14 mm nut to tighten the crank arm on.

    Was wondering if adding a washer & lock washer could solve the problem??

  18. #18
    Fast+Bulbous thinktubes's Avatar
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    Quote Originally Posted by rsg View Post
    Was wondering if adding a washer & lock washer could solve the problem??
    Doubtful. You're hearing the voice of experience speaking from everyone who recommends replacement.

  19. #19
    Wood David Newton's Avatar
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    Do you know anyone who can do heliarc? Quick fix...
    http://davidnewtonguitars.squarespace.com/

  20. #20
    7-speed doomsday prepper ThermionicScott's Avatar
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    There ya go. Spend some quality time adding material with a welder, filing and checking the contact patch with Prussian blue, and you won't have to replace that $5 arm after all.
    Quote Originally Posted by chandltp View Post
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  21. #21
    rsg
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    Pictures coming, as soon as I can get some Wi-Fi to transfer them off of my phone. (No Cell Service)

  22. #22
    Senior Member autoteacher's Avatar
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    Quote Originally Posted by David Newton View Post
    Do you know anyone who can do heliarc? Quick fix...
    David,

    The metal is stressed and HAS failed. Take the good advice offered and replace it. I wouldn't want you flying into the path of MY car when the arm breaks, I just washed it!

    Marc

  23. #23
    billy chuck eschlwc's Avatar
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    aren't those nuts kinda special, in that they have ridges on the inside face? they're not perfectly flat, so they kinda have some grip. i only had one bb like that and vaguely remember them.

    there are several left arms on ebay delivered at the buy-it-now price of $14ish.

  24. #24
    Gearhead old's'cool's Avatar
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    I know a few nuts that are kinda special, but they aren't the kind that you can adjust with a wrench from your toolbox.
    Geoff
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  25. #25
    billy chuck eschlwc's Avatar
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    ^ these are different nuts that kinda grip. you don't grip these. they do that. self gripping nuts. very special, as far as nuts go. which isn't far. a few inches.

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