How much does the brake cable stick out into the wind, if one uses a brake that isn't a center pull? The Trimax looks to go out to the side somewhat vs. the tririg. I'm considering both of these frames at the moment too and was leaning towards the integrated front end, vs. tririg bar, stem and brakes to keep it tidy. not sure what other bar options there are to keep it that clean.
Funny you should mention this as we just did some specific testing of the TriRig vs. the Trimax over the weekend, but before I address that, the reason I would lean toward an IAx series bike over the other IA's is the adjustability of the front end. On average, your position stands to be more aero on the IAx bikes over the original IA design because you can angle your forearms, and I suspect that would make a larger difference than the integrated front end. You can always install a Dagger stem and your own aero bar on the original IA and achieve the same position. We're also coming up with a "fix" for the stock Felt Bayonette bar to achieve angle on that as well.
For front brakes, I had seen a few tests where the Trimax brake tested a little better than the TriRig, but only by a watt or two at most. Recently, I looked deeper at the test runs, and saw some flaws in the protocols and questioned the results. I'm still not finished, and need to test the brakes on one more bike, but I think you're safe with the TriRig. Both are better than a "standard" brake (we used an FSA), but the results we're seeing are repeatable and noteworthy. I'll put something together in the next two weeks and publish the data for everyone. We'll also be doing some tests in the wind tunnel for yaw. So far, we've tested on an IA10 and a Cervelo P3. JShanney, who has posted on this thread, was one of our test riders and did an amazing job repeating multiple runs.
To me, the above shows why there should be a standardized method of testing and reporting of aero data. We'll be addressing this in the coming weeks with an idea we have that we believe will have a significant impact on the industry.
Jim Manton / ERO Sports
Aero Tidbits posted on Instagram