Exploding rim

Bumo_b
Bumo_b Posts: 211
edited April 2018 in Road general
Just a word of warning to all about using rims that are partially worn. I was riding on Mavic rims with worn brake tracks, although the wear indicator had not yet shown through. Got push into a curb by a van and where the rim touched the curb, it must of caught a slightly protruding bit and BANG!
I knew I was pushing my luck a little and have myself to blame for chancing it.

http://s1378.photobucket.com/user/dappymuppet/media/r-XvzkEEjoT53EXNH_t2n0CSTahZPDiWv-7P8rgwz1s-1536x2048_zpsl5sx7mga.jpg.html?sort=3&o=0

Comments

  • ugo.santalucia
    ugo.santalucia Posts: 28,317
    Can you not upload a photo instead of linking to a horrible host with billions of adverts and scams?

    To me that rim looks toast, meaning it looks like the brake track is well concave and ready to give way (as it did), but that might be an impression from the photo only. Is there a wear indicator on those Ksyrium?
    left the forum March 2023
  • webboo
    webboo Posts: 6,087
    I’m not sure what that photo is showing other than your tyre has come off the rim.
  • milemuncher1
    milemuncher1 Posts: 1,472
    That’s not massively unusual. I’ve had a worn Aksium rim go bang on me before. I tend to check for ‘dishing’ on the brake track a bit more carefully these days, as it’s a hell of a thing when it happens.
  • Bumo_b
    Bumo_b Posts: 211
    I do apologise for the use of the link, but it wouldn't let me upload an image/or I couldn't figure it, either way, was just trying to warn people not to be a big a muppet as me and risk injury.
    The photo shows the rim split away and curved up.
    Why are people so critical?
  • svetty
    svetty Posts: 1,904
    The difficulty here is that there is no way of knowing whether this could have occurred to a relatively new rim with a similar impact. Agree though that replacing worn rims is advisable.....
    FFS! Harden up and grow a pair :D
  • imposter2.0
    imposter2.0 Posts: 12,028
    The rim appears to be intact in that picture. So I'm a bit confused by the thread title...
  • joenobody
    joenobody Posts: 563
    Imposter wrote:
    The rim appears to be intact in that picture. So I'm a bit confused by the thread title...
    You're not looking closely enough ;) If it helps, you need to look for the rear side of the rim as you look at it.
  • imposter2.0
    imposter2.0 Posts: 12,028
    JoeNobody wrote:
    Imposter wrote:
    The rim appears to be intact in that picture. So I'm a bit confused by the thread title...
    You're not looking closely enough ;) If it helps, you need to look for the rear side of the rim as you look at it.

    ok - I think I'm with you now. So basically, the rim has failed on the right side, and the guy has taken the pic from the left side...?
  • joenobody
    joenobody Posts: 563
    Imposter wrote:
    ok - I think I'm with you now. So basically, the rim has failed on the right side, and the guy has taken the pic from the left side...?
    That's what it looks like to me.
  • shimanobottombracket
    shimanobottombracket Posts: 376
    Imposter wrote:
    JoeNobody wrote:
    Imposter wrote:
    The rim appears to be intact in that picture. So I'm a bit confused by the thread title...
    You're not looking closely enough ;) If it helps, you need to look for the rear side of the rim as you look at it.

    ok - I think I'm with you now. So basically, the rim has failed on the right side, and the guy has taken the pic from the left side...?

    That's a phenomenon the guy is unaware exists, and is what we call "stupidity".
  • Bumo_b
    Bumo_b Posts: 211
    My stupidity is down to the fact I was shaken up and just took the picture before my good lady dropped me off a wheel and I thought no more of it.
    Just trying to warn people not to assume the wear indicator is the be all and end all of rim wear as I found out. Kick that with being stupid enough to post something on here without someone trying to be a smart arse.
    Silly me, cyclists a friendly bunch? I wonder?
  • imposter2.0
    imposter2.0 Posts: 12,028
    Bumo_b wrote:
    My stupidity is down to the fact I was shaken up and just took the picture before my good lady dropped me off a wheel and I thought no more of it.
    Just trying to warn people not to assume the wear indicator is the be all and end all of rim wear as I found out. Kick that with being stupid enough to post something on here without someone trying to be a smart ars*.
    Silly me, cyclists a friendly bunch? I wonder?

    Can you not post a pic from the side that the rim has actually failed on?
  • Bumo_b
    Bumo_b Posts: 211
    Will try later, although in fairness it just looks like someone has taken a can opener along a foot long section of the concave bit!
  • slowbike
    slowbike Posts: 8,498
    Here u go - you just need to copy the IMG field - I've stripped the out of it too as we don't need to link back to botophucket really ...

    Anyway - yes - interesting - looking at the top the rim does look worn - but that could be the lighting and angle of it - any idea how old/how many miles?

    r-XvzkEEjoT53EXNH_t2n0CSTahZPDiWv-7P8rgwz1s-1536x2048_zpsl5sx7mga.jpg
  • Bumo_b
    Bumo_b Posts: 211
    About 3000 miles although plenty of that was in winter, so plenty of grime/water to wear it away. I knew I was chancing it a little.
  • shirley_basso
    shirley_basso Posts: 6,195
    dont use photobucket.

    Use imgr, google photos, flickr, tinypic ANYTHING but bloody photobucket.

    3000 miles isn't much even for winter.
  • pblakeney
    pblakeney Posts: 27,345
    Shirley Basso wrote:
    dont use photobucket.

    Use imgr, google photos, flickr, tinypic ANYTHING but bloody photobucket.

    3000 miles isn't much even for winter.
    It is not the amount of miles that count, it is the amount of braking.
    I brake 10 times as much in a 10 mile commute than I do in a 100 mile weekend jaunt.
    The above may be fact, or fiction, I may be serious, I may be jesting.
    I am not sure. You have no chance.
    Veronese68 wrote:
    PB is the most sensible person on here.
  • robbo2011
    robbo2011 Posts: 1,017
    Bumo_b wrote:
    I was riding on Mavic rims with worn brake tracks, although the wear indicator had not yet shown through.

    There are no wear indicators on Kysrium rims!
  • sloppyschleckonds
    sloppyschleckonds Posts: 8,019
    robbo2011 wrote:
    Bumo_b wrote:
    I was riding on Mavic rims with worn brake tracks, although the wear indicator had not yet shown through.

    There are no wear indicators on Kysrium rims!

    The OP was waiting for them to appear
    I'm sorry you don't believe in miracles
  • Bumo_b
    Bumo_b Posts: 211
    There are wear indicators, hemispheric cuts on the inside that will appear as holes on the outside once the brake surface has worn to minimum. These "should" appear on the rim next to the small square sticker with a hazard symbol and icon of a booklet. Definitely there, and also on the replacement rim I have ordered and received. My point was people shouldn't rely on them.

    https://www.google.co.uk/search?q=mavic ... Q3WsK31L_M:
  • robbo2011
    robbo2011 Posts: 1,017
    As I needed to replace the tyres on my bike and spurred on from this thread, this week I decided to buy a rim thickness gauge to measure the rim thickness of my Ksyrium SLS wheels that have done 35'000 km.

    They are slightly concave but did not seem that bad. The fronts measured around 1mm thick, but on the rear, one side measured around 0.8 mm thick which for me is at immediate replacement level, so the Ksyriums were retired. fortunately, I have a spare set of wheels I can use as a stop gap.

    At no point had any wear indicator shown itself on the rear. So my conclusions about wear indicators on kysrium SLS rims are:

    a) there isn't one, or
    b) there is one but it is useless as it should be showing with a rim thickness of 0.8 mm.

    Be careful folks.
  • shimanobottombracket
    shimanobottombracket Posts: 376
    Shirley Basso wrote:
    dont use photobucket.

    Use imgr, google photos, flickr, tinypic ANYTHING but bloody photobucket.

    3000 miles isn't much even for winter.

    and its even less if you want to fly from London to New York and your plane only has 3000 miles worth of fuel in it. I dont know of any wheels where you replace the wheel before the tyre. Actually I do, American Classics and Alex rims. But they are not really bicycle wheels anymore than Dawn French's arse is actually a moon of Jupiter.
  • trekvet
    trekvet Posts: 223
    All I can see is an advert for Photobucket.

    My rims don't go concave as I use softer blocks, and keep them detris free, as much cheaper to replace blocks than rims.

    Don't forget the sunscreen, even take more to apply at coffee stop.
    The Wife complained for months about the empty pot of bike oil on the hall stand; so I replaced it with a full one.
  • slowbike
    slowbike Posts: 8,498
    TrekVet wrote:
    All I can see is an advert for Photobucket.

    My rims don't go concave as I use softer blocks    , and keep them detris free, as much cheaper to replace blocks than rims.

    Don't forget the sunscreen, even take more to apply at coffee stop.

    They will, in time, wear out... that's just physics - sure a softer compound may prolong the life of the rim - nothing wrong with that - but you need to keep an eye on them anyway.
  • Bumo_b
    Bumo_b Posts: 211
    Here, to make it a little clearer is the inside of the rim, not the best photo, but on the inside of the rim is the following indent, concave in nature. It is on the inside of where you have the small warning sticker/booklet symbol.
    https://www.flickr.com/gp/157820340@N04/uNHaFa
  • robbo2011
    robbo2011 Posts: 1,017
    I took a look as the wheels are off the bike and my Ksyrium SLS wheels do not have that hole drilled. So probably not all versions of Mavic wheels have the wear indicator as shown.

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