deda carbon bars cracked (again)

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Comments

  • spankwilder
    spankwilder Posts: 169
    Some people repair chain/seat stays so if your daring you could give them to a 'specialist repairer', worth asking for his 'authorised frame repair centre' paperwork from whatever brand he specialises at, just to boost your confidence.

    Wiggle I'd guess will simply swap your bars out, proving they're overtightened is not worth the effort and is fairly impossible.

    sucking eggs but when you install, worth getting all the bolts to around 2nm (enough so the bar is actually held) ensure you've equal gaps top and bottom between the stem clamp/stem, then tighten the bolts evenly (Top>bottom etc) up to whatever torque is recommended.
  • LJK
    LJK Posts: 1
    markyone wrote:
    Brand new deda superleggero carbon bars cracked at 5nm fitting to the deda stem so not f**king happy.
    Bought these from wiggle going to see what hey have to say.Well I know what they will say.
    Very light bars wafer thin.
    Can they be repaired?
    001_zpsf1157807.jpg

    This is exactly what happened to me.I was using Wera torque wrench at 5Nm.
    I have searched max torque values for these components, only information is what i find through Deda website.
    First 5Nm, then 8NM which is way high, think.
    New Superleggera bars are now fastened @3Nm with carbon paste.However i am afraid that they may slip, and be ruined again.
    What kind of values you have used when assembling these components.Deda have not bothered to answer my questions.
    Either stem or bars did not have any instructions.
    @markyone, did you ever get your bars replaced?
  • pippi_langsamer-2
    pippi_langsamer-2 Posts: 1,470
    Torque wrenches for automotive engineering etc etc....not for lightweight bike parts IMO!

    I bought a torque wrench years n years ago as I used to be a bit ham-fisted with stuff. I foolishly put too much trust in the thing, and it sheared an alu' bolt off a brand new Thomson stem. Never used once since. I find it far safer to use feel...

    Personally, I'd buy a carbon fibre hammer before I bought a pair of CF bars.
  • dennisn
    dennisn Posts: 10,601
    Grill wrote:

    Still don't know why people buy these things. My alu bars are lighter, stiffer, cheaper and an assload stronger.
    Do you ride a carbon bike? If so how do you rationalize it, if carbon bars are junk?
  • cycleclinic
    cycleclinic Posts: 6,865
    Torque keys I think are not very accurate. I have these bars and I set my Park wrench to 3Nm and that was plenty. Carbon paste will also mean the torque needed is much lower. If the OP used 5Nm or a torque key he may applied 8Nm for we know. There will be no warranty claim other than the good nature of the retailer.

    If buying carbon bits have good feel and use a proper torque wrench. Ever wondered why shops have to charge it in part the proper tools cost real money! However a good mechanic will trust there feel even if using a torque wrench. If it started feeling like you have applied too much it is always wise to stop back off and check what going on.

    These Deda bars are 187g for 44cm so they are lighter than any aluminium bars I have seen, Nap D but you won't crack an alloy bar unless you are really hamfisted.
    http://www.thecycleclinic.co.uk -wheel building and other stuff.
  • bill57
    bill57 Posts: 454
    Rolf F wrote:
    Therefore any 'super-stiff' bars are likely to be too stiff for me.

    Sorry. How can bars be too stiff?
  • markyone
    markyone Posts: 1,119
    These bars are s**t and wafer thin, hit a pot hole and crack :twisted: 2nd set ruined again.
    1st set was torqed at 5nm and cracked wiggle partly refunded so bought another set and hey cracked again.
    I going back to 3t
    Colnago c60 Eps super record 11
    Pinarello F8 with sram etap
  • Grill
    Grill Posts: 5,610
    dennisn wrote:
    Grill wrote:

    Still don't know why people buy these things. My alu bars are lighter, stiffer, cheaper and an assload stronger.
    Do you ride a carbon bike? If so how do you rationalize it, if carbon bars are junk?

    I really can't be bothered to get into it with you Dennis.
    English Cycles V3 | Cervelo P5 | Cervelo T4 | Trek Domane Koppenberg
  • dennisn
    dennisn Posts: 10,601
    Grill wrote:
    dennisn wrote:
    Grill wrote:

    Still don't know why people buy these things. My alu bars are lighter, stiffer, cheaper and an assload stronger.
    Do you ride a carbon bike? If so how do you rationalize it, if carbon bars are junk?

    I really can't be bothered to get into it with you Dennis.

    Oh c'mon. It's an honest question. :?
  • Grill
    Grill Posts: 5,610
    dennisn wrote:
    Grill wrote:
    dennisn wrote:
    Grill wrote:

    Still don't know why people buy these things. My alu bars are lighter, stiffer, cheaper and an assload stronger.
    Do you ride a carbon bike? If so how do you rationalize it, if carbon bars are junk?

    I really can't be bothered to get into it with you Dennis.

    Oh c'mon. It's an honest question. :?

    Frames are different and take completely different types of stress (and aren't nearly as much a liability in the event of a crash). Plus you still can' build lighter and stiffer in alu or steel.
    English Cycles V3 | Cervelo P5 | Cervelo T4 | Trek Domane Koppenberg
  • dennisn
    dennisn Posts: 10,601
    Grill wrote:
    dennisn wrote:
    Grill wrote:
    dennisn wrote:
    Grill wrote:

    Still don't know why people buy these things. My alu bars are lighter, stiffer, cheaper and an assload stronger.
    Do you ride a carbon bike? If so how do you rationalize it, if carbon bars are junk?

    I really can't be bothered to get into it with you Dennis.

    Oh c'mon. It's an honest question. :?

    Frames are different and take completely different types of stress (and aren't nearly as much a liability in the event of a crash). Plus you still can' build lighter and stiffer in alu or steel.

    Not following how carbon bars "take COMPLETELY different.....". Bikes, bars, forks, wheels, take all manner of stresses that come from all sorts of things. To single out a frame vs bars in that respect is something I'm not following.

    As for "lighter and stiffer". I've used aluminum bars for years and just recently switched to carbon ones because I liked the idea of having a flatter top on them. Other than a lot less vibration in my bar end mirror I can't say that I've noticed any stiffness issues and weight has never been an issue with me. I do like the flatter tops though. Just a bit more comfortable.
  • Grill
    Grill Posts: 5,610
    And this is why I no longer engage with you. If you didn't have carbon bars you'd be decrying them saying they're the work of the devil.
    English Cycles V3 | Cervelo P5 | Cervelo T4 | Trek Domane Koppenberg
  • dennisn
    dennisn Posts: 10,601
    Grill wrote:
    And this is why I no longer engage with you. If you didn't have carbon bars you'd be decrying them saying they're the work of the devil.

    Well, you know me. Always willing to take the opposing view. :wink:
  • FatTed
    FatTed Posts: 1,205
    Well, you know me. Always willing to take the opposing view. :wink:[/quote]

    And so irritating
  • dennisn
    dennisn Posts: 10,601
    FatTed wrote:
    Well, you know me. Always willing to take the opposing view. :wink:

    And so irritating[/quote]

    "Irritating" how? Because I ask you to defend your views? I suppose that could be irritating if you have trouble doing so. :roll:

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