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  1. #1
    Fail Boat crewman
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    This is a warning!!

    Whenever your LBS tells you that you have a dip and dice in your braking surface. DO NOT, I repeat DO NOT inflate your tires to 120 psi.

    I did and it BENT the sidewall and peeled the brake surface off like tin can.

    The best part was I had a slime tube in there and the rim shredded the tube.

    It sounded like a gun shot went off and my ears are still ringing. I had slime everywhere. It was gross.

  2. #2
    Old fart JohnDThompson's Avatar
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    Eww... nasty!

  3. #3
    Mystery Meat gitarzan's Avatar
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    Quote Originally Posted by I_like_cereal View Post
    It sounded like a gun shot went off and my ears are still ringing. I had slime everywhere. It was gross.
    Sounds like a scene from a movie.
    Quote Originally Posted by Jseis View Post
    Is a ukulele player in a mandolin town and banned from all bars by the chief of police unless he leaves his strings and gravy at the front door.

  4. #4
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    OP, the dip goes under your lip and the dice hang off the review mirror, not on your braking surface!

  5. #5
    Insane Bicycle Mechanic Jeff Wills's Avatar
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    Quote Originally Posted by I_like_cereal View Post
    Whenever your LBS tells you that you have a dip and dice in your braking surface. DO NOT, I repeat DO NOT inflate your tires to 120 psi.

    I did and it BENT the sidewall and peeled the brake surface off like tin can.

    The best part was I had a slime tube in there and the rim shredded the tube.

    It sounded like a gun shot went off and my ears are still ringing. I had slime everywhere. It was gross.
    I hate to say "I told you so", but... I told you so! At least you didn't have it go bang on a ride, in the rain, 20 miles from home:
    Jeff Wills

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  6. #6
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    Why would you inflate your tires to 120?

  7. #7
    Bikaholic blamp28's Avatar
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    Quote Originally Posted by Camilo View Post
    Why would you inflate your tires to 120?
    Some tires are inflated to 120 or more. My road tires (700x23) max out at 120. I've always thought of slime for larger mtb type tires though and those usually max out around 60 or 65 psi
    Trek Fuel XC MTB, Giant OCR Road Bike, Rans Screamer - Tandem

  8. #8
    Senior Member clydeosaur's Avatar
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    I run my 23's @ 110 - 120 all the time & have never had a problem.

  9. #9
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    Simplest thing to do if any bike part looks worn is to replace, unless you understand that it could fail on you.

    If you had replaced the rim, you would have saved the tube and tire; spend a little now, to prevent unnecessary costs later

  10. #10
    Mister Bleak! mconlonx's Avatar
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    Your new rim will come with a wear indicator. Pay attention to it...
    Quote Originally Posted by Six jours View Post
    Bottom line: everyone here should listen to Mconlonx... he has it figured out and the rest of you, well, don't.
    I know next to nothing. I am frequently wrong.

  11. #11
    Senior Member
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    Just looking at what remains of your rim, it's apparent it was badly worn at the brake track. Overinflating that tire just made the inevitable happen sooner.

    I inflate 700x23 tires to 120 psi routinely but I also try to replace badly worn rims before they fail.

  12. #12
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    That is called proof testing, best done whilst wearing eye protection and tough gloves. Its quite a useful procedure if you think your braking surfaces are a bit thin.

  13. #13
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    Please explain what a "did and dice" is. I have never heard that term before.

  14. #14
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    Why inflate a 32mm tire to 120PSI? https://www.adventurecycling.org/res...SIRX_Heine.pdf

  15. #15
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    Unlike tubulars where the tire is a self-contained closed pressure vessel, wired-on tires are open on the bottom and require the rim to hold the sides in against the pressure. The stress on the side is proportional to the inflation pressure and the width of the tire.

    Here's an easy to understand explanation of how to calculate the stress as related to pressure and cross-section.

    Rims are built sufficiently strong to restrain the outward force of the tires they're designed for, but with brake wear progressively lose strength at the critical base of the flange. The point at which they blow apart depends on the tire pressure, and the tire width, and the amount of remaining strength, which eventually becomes inadequate to the task.

    If you ever see any hint of cracks running lengthwise along the brake track it's time to scrap the wheel. For those who pick up stones in the brake shoes, a single deep score can be enough to kill the rim.

    If your rims are deep enough you can push out the point of failure by mounting the brake shoes so that the brake track in within the box section of the rim and they don't remove material from the critical base of the tire flange.
    Last edited by FBinNY; 03-26-11 at 10:30 AM.
    FB
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    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.

  16. #16
    Senior Member
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    Quote Originally Posted by FBinNY View Post
    If your rims are deep enough you can push out the point of failure by mounting the brake shoes so that the brake track in within the box section of the rim and they don't remove material from the critical base of the tire flange.
    That's got some limitations too. The last rim failure I had cracked circumferentially right below the bead hook. Fortunately the only symptom was a noticable "tick" when I applied the brakes and the rim and tube held together long enough for me to get home.

    Lesson learned: No rim last forever.

  17. #17
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    Quote Originally Posted by HillRider View Post


    Lesson learned: No rim last forever.
    That's the key, you can only buy time, but eventually rims die and need rebuilding.

    I must either not stop enough, or have worse roads than most (probably true) because in over 100,000 miles of riding I've yet to ever wear out a rim's sides. My rims tend to die from impact damage, usually caused by rain filled potholes. It's kind of like getting hit by a bus before the coronary artery disease gets you.
    FB
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    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.

  18. #18
    Senior Member coldfeet's Avatar
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    Quote Originally Posted by Jeff Wills View Post
    I hate to say "I told you so", but... I told you so! At least you didn't have it go bang on a ride, in the rain, 20 miles from home:
    Or at speed on a downhill, I cringe just thinking about it!

  19. #19
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    Get Schwalbe marathon racers and forget the slime. bk

  20. #20
    Senior Member
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    Quote Originally Posted by bkaapcke View Post
    Get Schwalbe marathon racers and forget the slime. bk
    Definitely will reduce the mess, but won't prevent rim failure.
    FB
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    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.

  21. #21
    Senior Member xizangstan's Avatar
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    I think I know why they invented disc brakes for bikes...
    Who is John Galt?

  22. #22
    Senior Member jeepr's Avatar
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    Sounds exciting!

  23. #23
    Insane Bicycle Mechanic Jeff Wills's Avatar
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    Quote Originally Posted by davidad View Post
    32mm tire on the back of a tandem or (in my case) a rear-wheel-biased recumbent. I chatted with Jan Heine a couple months back here in Portland about this article. Very interesting and very opinionated person. But he backs up his opinions with testing.
    Jeff Wills

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  24. #24
    Senior Member BCRider's Avatar
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    Quote Originally Posted by xizangstan View Post
    I think I know why they invented disc brakes for bikes...

    Mountain bikers that used to ride a lot of downhilly areas in the days before disc brakes and lived in areas with LOTS of rain tended to go through at least one set of rims a season. Some went through two. The grinding action fo the mud in the pads combined with lots of energetic braking pretty much added up to "sanding" through the rim braking tracks in those heady days before discs became the solution for such riders.

    I live up close to "The Shore" and talk with a fair number of riders that consider this crazily extreme riding site to be "just another EXTREME day in the park". Those with a few years under their belt if asked "what is the best ever tech introduction for mountain bikes would likely rank suspension forks as number one but then waffle back and forth over disc brakes or full suspension as number two and three from the stories I've heard.
    Model airplanes are cool too!.....

  25. #25
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    Quote Originally Posted by mconlonx View Post
    Your new rim will come with a wear indicator. Pay attention to it...
    I've come back into cycling after a long hiatus, and I've read here before about the 'wear indicator' in a rim. What is it and how can you tell if a rim has it? If I had to guess, I'd say it is a dark-colored layer under the surface of the rim that becomes visible with wear. Am I close?
    Inquiring minds want to know.

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