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face plate failures(7 posts)

face plate failureslegs
Sep 3, 2002 12:52 PM
I hate that when I am descending balls to the wall (between 50 and 60 plus mph) one of the only things in the back of my mind is the thought that stem face plates seem to be a crappy design chioce.I have seen three guys have failures on group rides (with deda newton stems).
its hard to realize that your whole life is in the hands of two bolts... there has to be a better design solution to current stems.. something where the face plate can stay intact even if there is a failure in the bolts...
(my stem is an ITM millennium. I give it a once-over before every ride).

Nothing like blasting down a canyon knowing that there would be no way to recover...

you know?
Torque WrenchGregory Taylor
Sep 3, 2002 1:04 PM
Some faceplate failures (I don't know about the Deda Newtons) are caused by the retaining bolts failing. A torque wrench and following the manufacturers instructions to the letter is good insurance.
I hope,TJeanloz
Sep 3, 2002 1:09 PM
I hope that by a 'once over' you mean that you look for cracks and not that you give the bolts a little bit more torque- which was standard procedure among pro wrenches, until they realized that it was contributing to, rather than preventing, failures.
Sep 3, 2002 1:09 PM
Deda Newton has a four bolt face plate and it's not the face plate that was failing but rather the bolts stripping from the stem. In any event there are lots of other stems out there that don't seem to have the reproted failure rates. One might suggest that you either stay away from the ones with the bad reputations or reduce your speed until you resolve the nerve issue. Face it - your life is depending on all sorts of tiny little parts of a sub 18 lbs. machine - what could possibly go wrong?! ;-)
Sep 3, 2002 10:03 PM
no not a troll.. and yes i know the bolts are different on newtons...
just expressing myself...
after seeing a failure this weekend and taking stock in the stuff that goes through my head that i never really verbalize...

I do think that there is a better way to handle the face plate and i am willing to bet the design evolves a bit over time....
MAybe we'll go back to "7" quill stems.Sintesi
Sep 4, 2002 5:03 AM
Where you had to snake the the bar through. Nothing wrong with that. However, the open face plated stem (sounds like the way to say it) is the standard in the mountainbiking world. If anyone should be afraid of failure due to stress fractures it has to be those guys. So I suggest that maybe you should stay away from the ultra light designs and get something a bit more rugged for your peace of mind. If a stem is durable in abusive offroad conditions then all the better on the road. Yes? Just a suggestion.
re: face plate failuresclintb
Sep 4, 2002 11:46 AM
Easton just put up a pdf on this very thing. Seems that a two bolt design can more evenly distribute the stress. And that from a company that does make a four bolt stem.

Interesting if nothing else.