Broken stearing tube

Discussion in '"Shop" Talk' started by Rockbottom, Nov 13, 2017 at 4:13 PM.

  1. Rockbottom

    Rockbottom New Member

    Location:
    Staten Island
    Took a decent fall at Jungle last weekend and snapped my stearing tube. Wondering if this has ever happened to anyone before. Fork is 2011 fox talas 32. Was shipped back to the company to see if it’s even worth rebuilding. 4EABDD85-D1BA-4CE8-82EB-92CCC33F6108.jpeg E8AE3151-7626-4BDC-AE2E-44C95CCDA988.jpeg
     
  2. gtluke

    gtluke The Moped Team MTBNJ Halter's

    Location:
    Two Bridges
    Holy crap, did you fall out of an airplane?
    That's crazy.
     
  3. moose35

    moose35 Well-Known Member

    Location:
    Paterson
    wow thats kinda scary.
     
    Last edited: Nov 13, 2017 at 6:03 PM
  4. jimvreeland

    jimvreeland Shop: Hilltop Bicycles Shop Keep

    Location:
    Pissthataway
    I've never seen that. Be interested to see how much steerer was in the stem and how clean the cut was.
     
    Dingo likes this.
  5. 1sh0t1b33r

    1sh0t1b33r Well-Known Member Team MTBNJ Halter's

    Location:
    Orange County, NY
    How much steerer was in the stem!?
     
    Juggernaut likes this.
  6. Juggernaut

    Juggernaut Well-Known Member

    You can see it in the photo.
     
  7. Juggernaut

    Juggernaut Well-Known Member

    Looks like it might have had close to 30mm of spacers though. That’s kinda pushing it....leverage wise.
     
  8. fidodie

    fidodie Well-Known Member Staff Member

    Location:
    Branchburg
    sort of - there is no spacer above the stem (1st pic) , so it could have been set short of the top clamp -

    even then, it sheered off just below the stem.

    crazy - i'd expect some other type of fatigue.

    mystery here - hope they come through with some parts.
     
    Juggernaut likes this.
  9. Juggernaut

    Juggernaut Well-Known Member

    If I'm looking at it correctly, the light section on the front of the stem (handlebar side) is the top of the steerer. (Blind Assumption 1).

    The stem itself is reinforcing the upper steerer the headset is doing the same at the at the frame. (Blind assumption 2).

    Spacers being loose and segmented offer little to no reinforcement on the non tapered section of steerer. (Blind assumption 3).

    The hard straight line at the bottom of where the stem (reinforcing the steerer) meets the farthest non reinforced section of non taper portion of the steerer seems at least to my simple minded self to be a likely spot for it to sheer (on a non corroded tube). That or just above the headset. Like snapping a pencil on the edge of a desk....



    Great, revert to grade school antics to try and solve a mystery. o_O
     
    fidodie likes this.
  10. qclabrat

    qclabrat Well-Known Member

    Location:
    Warren
    Can you load a pic of the bike before the fall?
     
    Dingo likes this.
  11. Dingo

    Dingo Well-Known Member

    I noticed, there appears to be a hole drilled parallel to the axle, on both sides of the tube, and in the center of the crackerage.

    As for stacks, 30 mm + on all my bikes, never a problem, always a 10mm spacer on the top to ensure full steer tube contact. An old BMX trick.
     
  12. Rockbottom

    Rockbottom New Member

    Location:
    Staten Island
    So the fall took place at the end of Rhino where it links back up to main trail on the first roller. Hit the crest of the roller and my wheel wasn’t straight on the descent. Bike came out from under me. Not really sure how it happened. I’ve hit that spot dozens of times without any issues. After the crash the bike seemed fine. Patched myself up and kept ridding, then noticed the bike felt weird. Turned the handle bar and it snapped right off.

    Not sure of the exact length of spacers under the stem but think it was 2 and 1/2 spacers. Seemed standard to me but I’m no expert.

    Have had this setup for years with no issue. Only recent change made to the bike was changing out to a smaller length stem
     
  13. Rockbottom

    Rockbottom New Member

    Location:
    Staten Island
    FE6946BB-7562-49F3-AD4B-0A8CCDB75660.png Not the best pic, sorry. This was with the longer stem
     
    Juggernaut likes this.
  14. Juggernaut

    Juggernaut Well-Known Member

    Yeah, this pic shows a reasonable amt of spacers.... The mystery continues.
    Real interested in what you learn. Glad it happened when it did, dodged a serious injury there.
     
  15. jimvreeland

    jimvreeland Shop: Hilltop Bicycles Shop Keep

    Location:
    Pissthataway
    Was the shorter stem taller? If so, that's the culprit.
     
  16. dmkalemba

    dmkalemba Member

    Too much torque when you put on the new stem?? The tube looks like it is flattened on one side.
     
  17. StayHydrated

    StayHydrated Swedish Chef

    Location:
    Morris Plains, NJ
    Do you have any closer/detail photos of the crack, the exposed surface, etc?
     
  18. moose35

    moose35 Well-Known Member

    Location:
    Paterson
    Yes maybe new stem was over tightened
     
    fidodie likes this.
  19. qclabrat

    qclabrat Well-Known Member

    Location:
    Warren
    yeah, I think that could be it, the new shorter stem appears to have considerably more height
    did you notice if there was more space when screwing in the top cap or did you need to remove spaces to make similar to the last stem?
    I've attached stems with a too short steerer before, and had to torque it extra to keep it tight, could also be another contributing factor

    good that your caught it before another hard landing, interested to see what Fox will do after their analysis
     
  20. w_b

    w_b Well-Known Member

    Location:
    central jersey
    looks like you dodged one there

    stem change = smoking gun
     

Share This Page