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Thread: This sucks

  1. #1
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    Default This sucks

    glad it was pissing down rain the last 3 days and I was on the rollers when it happened :omg:. I've got a slightly used rim in case anyone is interested. No more lightweight rims for me.
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    Frank Beshears

    The gentlest thing in the world
    overcomes the hardest thing in the world.

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    Damn, Frank. How exactly did it fail? Did it just go boom?

    jimi
     

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    boom, sss damn, in that order. had a slow leak on the last ride when I got to a dry spot with about 40 psi in the tire rode easy had the challenge tires on so i thought the rim was fine guess not. I'll get to use my new wheel building skills again I guess.
    Frank Beshears

    The gentlest thing in the world
    overcomes the hardest thing in the world.

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    Wow. That's not even a JRA incident. Maybe more like a Just Spinning In Place incident. JSIP or JSIPI. I just coined that. Everyone is welcome to use it.
    Fights begin, finger prints are took, days is lost, bail is made, court dates are ignored, cycle is repeated.

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    that must have scared the pi** out of you. better on the rollers than on the road.
     

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    Wow!

    Just curious - how old are the rims? Are the sidewalls heavily worn? No judgement, just curious.

    FWIW, this can't happen on a tubular rim because the rim does not need to support the pressure in the tire.
    La Cheeserie!

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    That buh-lows. What PSI were these pumped to and how many miles'ish?

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    Challenge parigi roubaix tires 90psi rims have about 1000 miles on them and the sidewalls didn't appear worn to me. I had these built last spring for the Goodrich. Maybe the tires are to large for the rim? Needless to say the front has become suspect and will not be ridden again. Need two new rims, suggestions? Just glad I decided to make some position changes and test them before Sat, I'd been about 10 miles into a 100 mile tailwind ride otherwise. That wouldn't have been pretty.
    Frank Beshears

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    I had the EXACT same thing happen to me this winter on the rollers. Same rim too. However, before everyone responds with a knee-jerk reaction regarding the quality of Ambrosio rims, mine was worn and the split was inevitable.
     

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    Default Machined Rims

    One of the wheel experts (jobst brandt, maybe) says that machined braking surface will magnify any inconsistency in the rim extrusion thickness or the "trueness" of the rim.

    Basically, when the rim surface is machined, it's removing material down to a some reference point, but if the rim is slightly bowed out, it still removes down to the same reference -- removing more material.


    Since you can't hardly get un-machined rims, it doesn't much matter, but it does explain why a rim fails in 1000 miles versus the same failure that used to occur after 5000 miles in wet, dirty conditions.

    Dwight
     

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    Experienced the same joy with a CXP-33 but in my case it was definitely wear. Well over 5K and lots of rainy riding. I was on the road, but luckily it was the rear, and I was going uphill.
    Dan Fuller, local bicycle enthusiast

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    Default Don't...

    ever wear those shoes again.


    :vroam:
     

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    I've never destroyed a rim riding the rollers, but I have punched the handlebars through a wall. I had AmClassic rollers and I was getting a drink when the top of the bottle popped open dumping water on the front roller. The front wheel slid out and I punched the bars through the wall next to me. My hand was still around the bars.
    Weight Doper

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    Quote Originally Posted by dwightskin View Post
    ...the same failure that used to occur after 5000 miles in wet, dirty conditions.
    You'd expect rims to fail after 5000 miles?

    In typical UK conditions (rainy, plenty of grit/dirt from the road) you'd be going through quite a few wheelsets...
     

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    Default I am not exactly sure

    but is this a new Model Excellence rim that has a profile closer to the Excellight rim?
    The other day I noticed the rim profile of Exellence had changed in appearance.

    I split an Excellence, just a little spit
    and I split a MA2 {many moons ago}
    both ten years old and very worn, both had walls worn almost right through.
    I use a lot of Ambrosio product here and all good so far
    Cheers Dazza
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    that thing is worn through,
    you need to look at it as routine maintenance.
    everything wears out. these wore out many rides ago.
    you use them for cross?
    buy yrself some new wheels and consider yrself lucky this time.

    current rims have a small indent that is a wear indicator.
    then the indent disappears the rim is shot..
     

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    What rims to replace them with? This is religion bro.

    For you, I'd pick Velocity aeroheads. I've had very good luck with them and these are the wife's daily riders.

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    Nothing new, but if you're sure that rim only had 1k miles on it then yes; it lived a very short life. I've blown through a lot of sidewalls but I usually get a few week's warning, feels like a flat spot on the rim when braking. Of course I ignore it, thinking it's just A FLAT SPOT ON THE WHEEL. Then the rim splits, and I learn it wasn't just a flat spot on the wheel.

    Here's my latest blow out. Ten minutes out the door on my mountain bike, I apply the brakes and hear a POP!, THUMP THUMP THUMP. But I KNEW this rim wasn't long for this world.


    My current favorite rear rim is the Velocity Aerohead O/C. I've had good luck with Mavic Open Pros and MA-3s and Open Sport rims.
     

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    Quote Originally Posted by dwightskin View Post
    "...it does explain why a rim fails in 1000 miles versus the same failure that used to occur after 5000 miles in wet, dirty conditions..."
    I'd be pretty angry if I experienced rim failure at 5000 miles, regardless of prevailing weather.
     

  20. #20
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    Quote Originally Posted by Blue Jays View Post
    I'd be pretty angry if I experienced rim failure at 5000 miles, regardless of prevailing weather.
    Really? Go buy any Mavic ceramic rim and call me in 15 yrs.

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