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Deda Mag Stem(4 posts)

Deda Mag Stemwerdna
Mar 5, 2003 10:44 AM
How durable is this stem? Would you only use it for a race bike? I was not planning on training on it extensively, but I would probably ride/race on it during the spring/summer. I would train on another bike during the winter. How many years would it last?

why dont you save your money and get the newton.the bull
Mar 5, 2003 5:52 PM
This is what I am using and I think it is great!I am sure the mag is lighter and see no reason why you could not race it.But I also see no reasons why a deda zero could not be raced.As far as how many years it would last? There are just to many variables!I guess it would last longer than the bike if it was a trek.But if you had a Ti bike you might have to replace the stem after a couple of years.
re: Deda Mag Stemlitesp
Mar 6, 2003 10:46 AM
A friend of mine in the business of manufacturing stems has tested ITM's magnesium stem against a number of AL equivalents and found that the mag stem failed at around 45K cycles compared to around 130K for the Deda's Newton. Aside from the lower fatigue limit, magnesium is also more prone to corrosion than AL unless finished with care. I'd be concerned about the delicate unfinished threads, unless heli-coiled.

From an automotive application -
"Under ambient and corrosive conditions the equally shaped magnesium parts achieve a fatigue strength of about 65 to 70% of the aluminium parts' strength which is of the same magnitude as the ratio of the materials' density."

Paying 2-3 times the price of a superior AL product to save 20-30 grams of non-rotating weight is not the best investment IMO.
re: Deda Mag Stemwerdna
Mar 6, 2003 12:28 PM
I was only considering the Mag stem because I'm a shop employee. However, I will probably just get the Newton.


btw, know anything about the fatigue life of some of the carbon handlebars?