Deda Nero Zero and 3T Mistral Bars -- potentially dangerous

Sleeping_menace

Despite being torqued to BELOW the max rated spec, I've had a Deda Nero Zero face place dent into and crack a 3T Mistral bar, thereby ruining the bar, and leaving it unusable.
If any of you are running this combination, check your bars carefully.


More pictures and a bit more info on my blog site:
http://anotherdooratthe.endoftheinternet.org/2011/05/13/deda-nero-zero-and-3t-mistral-bar-damaged-carbon/

As always, no ads, I don't make money, just sharing info...

Rodrego Hernandez

It's sensible not to mix brands with bars and stem as sometimes they are a slightly different diameter.

ShutUpLegs

Was not being torqued to the correct spec the reason?

Sleeping_menace

no, it was torqued correctly, tightened down correctly..etc..
That's what's under my skin so far, is that I'd done it all right, an checked all the boxes.

I think it's a combination of the faceplate being so extensively milled for weight reduction, and possibly being of too soft of an alloy which allowed this to happen - but whatever the reason, it was always torqued within spec for the bars .. this simply shouldn't have happened.

ozzzyosborn206

i think what shutuplegs was getting at is that you stated that you tightened them to less the the recommendation, which could have meant there was a bit of movement of the bar in the stem which is why they dented. That aside it shouldn't really have happened

Monty Dog

Deda OS standard is 31.7 whereas 3t is 31.8 - either component only needs to at the extremes of their dimensional tolerance to cause you a problem.

Sleeping_menace

Ozzy :

I'd tightened them to less than max rating of 5.5 on the aerobars. My logic being if 3T says they'll withstand 5.5T max, than 4.5 would be a safe starting point.
The little bit of movement didn't happen right away, it was a month later, there was the tiniest bit of movement in the bars, which then went away as I torqued to 5Nm....still within the max rating for the bar clamping area.


Very frustrating this..