Ok I emailed Veltec Sports about the 2-bolt stem restriction and here's what they said:I wrote:
It has come to my attention that the EC90 Equipe Bar has a 2-bolt stem restriction in order to avoid crimping just like the EC90 and EC90 OS predicessors. However I have seen several of these bars mounted up to 4-bolt stems. And most recently I saw a photo in Pez Cycling News when they did a review of your products and had an EC90 Equipe shown mounted up with a 4-bolt stem. I'm confused.http://www.pezcyclingnews.com/?pg=fullstory&id=3116
(second photo) They Wrote:
Thanks for your interest in Easton.
Here is the short version.
Easton has found that a 4 bolt stem can put way too much stress on a carbon bar. Recommended torque for a 4 bolt stem is 48 inch lbs. That isn't much torque. People being people don't use torque wrenches and will over tighten the bars which will lead to failure. To try to get around the over tightening problem, Easton has put 2 bolt stem only on the bar. The bar is approved for use with aero bars and if you read between the lines.....
Just pay attention to torque specs. OK?
Veltec Sports Inc.
Warranty & Technical Support
Honestly I don't know exactly what he's trying to say. Is he saying that it's really ok to use a 4 bolt as long as you be really careful with the torque? I just don't know for sure what he means by "....and if you read between the lines....."
I think what he is trying to say is if
you are a good wrench, and if
you have a good torque wrench and if
you use it- you are probably ok with a 4 bolt stem. However, if any of these are not true- then go with a two bolt.
However, if you crimp the bar using a four bolt for any reason you're screwed- the rep made that clear to me. No warranty. Given how expensive these bars are, and how inexpensive the nice solid EA70 stem is (and probably the same weight as the FSA OS115 it replaces), I figured why risk it? IMHO, matching brands between the bar and stem is usually a darn good idea anyway. Plus the results of a error here can be quite grievious- no sense taking a foolish risk to save 20 grams.