Advertise on Bikeforums.net



User Tag List

Results 1 to 12 of 12
  1. #1
    Pedaling fool ShinyBiker's Avatar
    Join Date
    Jul 2007
    Location
    Arlington, VA
    My Bikes
    07 Schwinn Voyageur GSD, Next Avalon, 2007 Dahon Yeah
    Posts
    776
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Blowout warped my rims! Do I have cheap rims?

    I was replacing a tube in my rear tire. I'm pretty sure I aligned it right inside the tire. I pumped it up to just inside the max PSI (60). I turned around to look for my wrench and I look back and see a bulge on the side. I head over to see if I can release some air to prevent a blowout but I was too late. It popped.

    I was really surprised to see that my rim had a warp or bulge right where the blowout ocurred. Do I have a cheap rim? This was an old 26" Fuji MTB. I had replaced the tubes before on this bike with no problems. I've heard of "double wall" rims. Do I need to upgrade? Thanks.

  2. #2
    Uber Goober StephenH's Avatar
    Join Date
    Sep 2007
    Location
    Dallas area, Texas
    Posts
    10,568
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    I would guess that a warped rim made it blow out, not the other way around. Check if any spokes were already broken.

    With the bulge on the side, that means the tire wasn't seated on the rim right in the place, most likely, so was bulging out as it inflated- and one cause for that could be a warped rim.
    "be careful this rando stuff is addictive and dan's the 'pusher'."

  3. #3
    Pedaling fool ShinyBiker's Avatar
    Join Date
    Jul 2007
    Location
    Arlington, VA
    My Bikes
    07 Schwinn Voyageur GSD, Next Avalon, 2007 Dahon Yeah
    Posts
    776
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by StephenH View Post
    I would guess that a warped rim made it blow out, not the other way around. Check if any spokes were already broken.

    With the bulge on the side, that means the tire wasn't seated on the rim right in the place, most likely, so was bulging out as it inflated- and one cause for that could be a warped rim.
    You think the rim was already warped? I've ridden this bike before with no problems. Not too long ago I spun it and it was true. It certainly wasn't as bulged out as it is now.

    What's done is done, but will a high quality rim have prevented a warp from a blowout like this?

  4. #4
    Oldschool
    Join Date
    Jun 2008
    Posts
    57
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You can never really speak in absolute terms, but let's just say I've seen tires blow up and warp cheap rims, and it's been a really long time since I've seen a blowout warp a double wall rim.

  5. #5
    Pedaling fool ShinyBiker's Avatar
    Join Date
    Jul 2007
    Location
    Arlington, VA
    My Bikes
    07 Schwinn Voyageur GSD, Next Avalon, 2007 Dahon Yeah
    Posts
    776
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Sekine View Post
    You can never really speak in absolute terms, but let's just say I've seen tires blow up and warp cheap rims, and it's been a really long time since I've seen a blowout warp a double wall rim.
    Thanks. I guess I'm relacing this wheel to a double walled rim.

  6. #6
    Senior Member
    Join Date
    Mar 2008
    Posts
    4,225
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Are you saying your whole wheel has gone out of true, or are you saying that you have a a localized bulge to your rim sidewall? If it's the latter you need to be aware that braking (assuming rim brakes)will eventually wear the brake track of the rim down to the point where it will collapse outwards. Higher presures of course makes this more likely, but it will eventually happen to any rim, double-walled or not.

  7. #7
    Senior Member
    Join Date
    Dec 2004
    Location
    Athens, Ohio
    My Bikes
    Custom Custom Custom
    Posts
    5,104
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Ive seen some really soft cheap rims come through the shop. So yes, a blow out can cause your wheel to go out of true. Go get a Sun CR18 or Rhyno Lite and you'll be fine.

  8. #8
    It's MY mountain DiabloScott's Avatar
    Join Date
    Sep 2006
    Location
    Mt.Diablo
    Posts
    5,481
    Mentioned
    6 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by ShinyBiker View Post

    I was really surprised to see that my rim had a warp or bulge right where the blowout ocurred. Do I have a cheap rim? This was an old 26" Fuji MTB.
    Old rims get thin in the walls from braking and will eventually start to crack or separate; it's possible your rim started to fail before the blowout and the blowout put it over the top.

    You'll need a new rim no matter what, but failure of a well-used rim doesn't mean you have to go with something extra beefy next time.
    http://diabloscott.blogspot.com/

  9. #9
    Pedaling fool ShinyBiker's Avatar
    Join Date
    Jul 2007
    Location
    Arlington, VA
    My Bikes
    07 Schwinn Voyageur GSD, Next Avalon, 2007 Dahon Yeah
    Posts
    776
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    My wheel was true about 2 rides ago when I visually inspected it (lift the wheel and spin it). Stephen H said that my wheel may have been slightly bulging thus making the blowout easier to happen. I would think that a slight bulge would cause it to wobble slightly or look out of true, but I don't know. Right now it has a large protusion (sp?). I do use rim brakes. thanks, again.

  10. #10
    Senior Member
    Join Date
    Mar 2008
    Posts
    4,225
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by ShinyBiker View Post
    I would think that a slight bulge would cause it to wobble slightly or look out of true,....
    Well, sort of. If it's out of true then BOTH sides of the rim will have moved from where it's supposed to be. If it's one of the sidewalls giving up the ghost the other will usually remain intact and in place. It can also be seen by the way the rim will look more flared when and where the sidewalls are collapsing.

  11. #11
    Senior Member Cannondaler's Avatar
    Join Date
    Dec 2007
    Location
    Atlantic Beach, FL
    My Bikes
    Cannondale F600sl, Windsor Falkirk Carbon
    Posts
    205
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Just a thought, what caused you to replace the tube in the first place? Did you have a flat? If so what caused the flat? If you hit a bump or something and got a snake bite flat you may have dented the rim at the same time.

  12. #12
    Pedaling fool ShinyBiker's Avatar
    Join Date
    Jul 2007
    Location
    Arlington, VA
    My Bikes
    07 Schwinn Voyageur GSD, Next Avalon, 2007 Dahon Yeah
    Posts
    776
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Cannondaler View Post
    Just a thought, what caused you to replace the tube in the first place? Did you have a flat? If so what caused the flat? If you hit a bump or something and got a snake bite flat you may have dented the rim at the same time.
    No flat. I was swapping out the knobby 26" MTB tire to a slick one for pavement riding.

Posting Permissions

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