Hot!Broken riser stem (to handlebar) on CA 2.0

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giaruso
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2013/09/09 13:05:40 (permalink)

Broken riser stem (to handlebar) on CA 2.0

I've had my Bacchetta CA 2.0 for about two years now and today, on a ride about 20 miles from home, the riser stem broke at the weld joint just below the handlebar clamp.  Has anyone else had this failure?  Anyone know if Bacchetta has a redesign or stronger riser stem for the CA 2.0?  Any discussion on this issue will be highly appreciated.
#1

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    tfulnecky
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    Re:Broken riser stem (to handlebar) on CA 2.0 2013/09/09 14:59:44 (permalink)
    Is your riser and stem one piece or two?  On my 2012 CA 2 they were two separate pieces and I'm holding the 4" stem that came on it in my hand and there are no welds on it, the main body is one solid cast piece.   Did you buy the bike new and then put another riser/stem setup on it??
     
    Terry
    #2
    Crit Rider
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    Re:Broken riser stem (to handlebar) on CA 2.0 2013/09/09 15:02:36 (permalink)
    Prolly best to give Bacchetta a call. There was also a 3 piece stem. 
    Any crashes?
    Do you pull on the bars? 
    #3
    giaruso
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    Re:Broken riser stem (to handlebar) on CA 2.0 2013/09/09 20:53:33 (permalink)
    It is a two piece welded construction. The CA 2.0 was purchased new June 2011. The riser stem is original.
    #4
    giaruso
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    Re:Broken riser stem (to handlebar) on CA 2.0 2013/09/09 20:55:32 (permalink)
    No crashes, but I do pull on the bars.
    #5
    Doc Dan
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    Re:Broken riser stem (to handlebar) on CA 2.0 2013/09/10 07:01:54 (permalink)
    Don't pull on the bars.  They'll crack / break.  Doesn't matter if you have the original gooseneck riser or a straight pipe and stem.  Both will break.  Just the way it is. 
    #6
    BlazingPedals
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    Re:Broken riser stem (to handlebar) on CA 2.0 2013/09/10 08:12:25 (permalink)
    Doc Dan
    Don't pull on the bars.  They'll crack / break.  Doesn't matter if you have the original gooseneck riser or a straight pipe and stem.  Both will break.  Just the way it is. 

     
    Yes. If you flex aluminum, it work hardens and will eventually break. Been there done that - with a non-Bacchetta bike. So, to put it another way, it's not a manufacturing defect; the material just doesn't handle mis-use well.  Hmm... I see a potential market for aftermarket Ti risers!
    #7
    tojesky
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    Re:Broken riser stem (to handlebar) on CA 2.0 2013/09/10 08:48:50 (permalink)
    My CA2.0 came with the two-piece riser and stem.  Riser, Adjustable height section and stem. I like it better than the gooseneck riser.
    http://www.flickr.com/photos/69819618@N06/9719186122/
     
    post edited by tojesky - 2013/09/10 09:02:09

    UMCA member
    2013 CA2.0 - 700c
    2006 Corsa  (Sold July, 2013)
    #8
    steamer
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    Re:Broken riser stem (to handlebar) on CA 2.0 2013/09/10 13:10:11 (permalink)
    aside from any (valid) ideas surrounding pulling on the bars as a matter of effective technique, here is some food for thought:  plenty of aluminum DF stems and bars out there.  guys push and pull on them.  hard.  breaks are the exception not the rule.  it's not the material, it's the application / design, etc.   I bet my Nitto bars and stem on my DF will out-live me.

    -Tom
    '08 Giro 26
    Musashi
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    http://rothrockcyrcle.wordpress.com/
    #9
    giaruso
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    Re:Broken riser stem (to handlebar) on CA 2.0 2013/09/10 14:30:02 (permalink)
    Doc Dan

    Don't pull on the bars.  They'll crack / break.  Doesn't matter if you have the original gooseneck riser or a straight pipe and stem.  Both will break.  Just the way it is. 


    I got you.  Soon as I get her fixed, I'll go back into training.
    #10
    giaruso
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    Re:Broken riser stem (to handlebar) on CA 2.0 2013/09/10 14:33:21 (permalink)
    So that's what the new design looks like.  I did contact Bacchetta and they are sending me that new design.  Hopefully, with my new stem/riser and revisions to my riding style, the new setup will last more than 2.3 years this tiem.  Thanks for the picture.
    #11
    Doc Dan
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    Re:Broken riser stem (to handlebar) on CA 2.0 2013/09/11 07:58:47 (permalink)
    You didn't ask this but ... I really don't like risers.  Especially out here with so many steep and twisty switchbacks.  The riser gets in the way of me seeing what is on the road ahead (5 meters) in front of me.  And when you're screaming around switchbacks at 30+ mph you really need to see if there is a rock, a hole or some sand in front of you. 
     
    I don't like tillers either but for, obviously, different reasons.  Very often I need to have strong control of the front wheel to maintain a careful line to avoid road defects (holes, ridges, insufficient angle grade on turns).  More important, though, is dealing with twitchy headwinds and crosswinds at 25+ mph.  It takes some skill to deal with strong crosswinds at speed but I'd never get it if I had a tiller.  I need to grip handlebars that are wider than what a tiller offers. 
     
    The major draw of the Cruzbikes (Silvio and Vendetta) was the elimination of the riser.  From the crank to the handlebar the CBs have a straight, smooth and unimpeded line allowing for both seeing the road ahead of me and the handlebars wide enough to allow me to control on turns.  But the Cruzbikes have a fatal flaw that no design tweaking can eliminate.  Because the bottom bracket and front wheel are one unit (front wheel drive) it makes for unstable bike handling on straight fast descents, descending switchbacks, less than perfect road surface (holes, bumps, ridges), and crosswinds. 
     
    So when I find a bike with everything that Bacchetta offers but without the riser I'll be ready to test it out.   
    #12
    BlazingPedals
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    Re:Broken riser stem (to handlebar) on CA 2.0 2013/09/11 10:04:32 (permalink)
    I've broken aluminum handlebars on an upright. If they flex, they will eventually break. That Nitto stem is built heavier and is much shorter than a recumbent riser. It doesn't break because you can't flex it.
    #13
    giaruso
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    Re:Broken riser stem (to handlebar) on CA 2.0 2013/09/11 17:38:07 (permalink)
    Well, another answer to the stem riser would be under seat steering.  What do you think of that?
    #14
    Doc Dan
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    Re:Broken riser stem (to handlebar) on CA 2.0 2013/09/11 17:52:49 (permalink)
    Under seat steering. 
    Unstable unless it's just casual and recreational. 
     
    giaruso

    Well, another answer to the stem riser would be under seat steering.  What do you think of that?


    #15
    Denny Crane
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    Re: Broken riser stem (to handlebar) on CA 2.0 2017/08/17 10:37:46 (permalink)
    Denny - 
    My bike is the exact same age as yours, and the weld on the riser failed today. Fortunately, I was turning onto a pedestrian bridge, only going about 10 MPH. I am damn lucky it didn't fail yesterday, when I was doing 35 on PCH near San Onofre.
     
    Bacchetta should instruct everyone with the old curved riser to replace it.
    #16
    bentcyclist
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    Re: Broken riser stem (to handlebar) on CA 2.0 2017/08/17 11:22:08 (permalink)
    Bacchetta does instruct riders to not pull on the bars. A lot more effective to brace against the seat back for a power boost than yank on the bars during climbing. No pull, no break.
    #17
    Denny Crane
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    Re: Broken riser stem (to handlebar) on CA 2.0 2017/08/17 16:50:35 (permalink)
    bentcyclist
    Bacchetta does instruct riders to not pull on the bars. A lot more effective to brace against the seat back for a power boost than yank on the bars during climbing. No pull, no break.

    Objection: Assumes facts not in evidence. Lack of foundation. 
    #18
    Denny Crane
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    Re: Broken riser stem (to handlebar) on CA 2.0 2017/08/17 16:54:17 (permalink)
    Ordinarily, I don't pull on the bars, but once in a while I like to show off at the beach lot and do wheelies.
     
    #19
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