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Aero Bar - Road Bike Positioning(4 posts)

Aero Bar - Road Bike PositioningPhil W
Aug 15, 2002 5:21 AM
As a biker, finished my first tri at the weekend in top 10% and am hooked!

Planning to fit aero bars on my Cannondale CAAD5, and have been reading up a bunch on slowtwitch.com etc on positioning. I don't have the energy to be flipping round my position as the bars come on and off, and hence am looking for something that will accommodate fairly conventional road geometry (seat angle 73.5ish)- currently looking at shorter bars such as the Profile Jammer GT or Cobb "Big Slam".

Opinions on these please, any other options, and with the Syntace C2's pads sitting behind the bars, would these also avoid an "overstretched" position on conventional road geometry?

Thanks!
re: Aero Bar - Road Bike Positioningbrider
Aug 15, 2002 8:00 AM
I'm running a set of the (old) Profile Split Seconds on my road bike (Softride, so I don't really know what the seat tube angle is, but it's fairly slack). I've modified them to be shorter than stock. Not a difficult task -- hack saw and file does the trick. I'm about to take off another 1/2" in length (now requires trimming off the bolt and internal sleeve as well). The Jammers might do the trick for you. Pad positioning may be a problem for you, however. Using shortie bars generally puts the pads mid-forearm. I happen to like this position, but most people don't. Rearward positioned pads will help, but may interfere with the knees on standing up (depends on your set-up).

Something you can do is to get a second seatpost and saddle that's got a forward (or more forward) position. Mark the insertion on both set-ups. Swapping out seatposts is pretty straight forward and easy. Just an option.
swapping seat posts....Steve_0
Aug 16, 2002 3:46 AM
exacty what i do; works great.
Haven't had problems with being overstreched. . .js5280
Aug 15, 2002 8:12 AM
I'm riding an Airborne Zeppelin w/ a 73 angle and I use Profile Design Airstrykes which has adjustable length. I actually have the length out as far as I can go despite a slack seat tube but I also have a little longer than average forearms and torso. I wouldn't say my position is super aggressive but my back is fairly flat and it's a comfortable position I can hold. Here's the source I used to help me dial in my position: http://www.triathlete.com/art.asp?1=2&2=51&3=30&pg=1

The other nice thing about the Airstrykes is that the arm rests spring up so you can get to the tops. There's just a slight weight penality over fixed rests but since I don't take them off, conveinence more than offsets a few extra grams. The only thing I am looking to change on my postion is going with a forward seat post. I get a fair amount of pressure from the tip of the saddle. I'm hoping that a forward post will help towards getting that right hip angle, take off that pressure, and a be a little more aero. Right now I'd say my elbow bend is 110 degrees so a forward post should get me into a nice 90 degree bend and get my back flatter. I'll also need to shorten my aerobar length which I can do since they are adjustable. In the mean time, I bump my seat post up a 1/4" or so and tilt the seat forward just a few degrees. That tends to push me forward and open up that hip angle. I could also move the seat forward but since I use same bike for day to day riding, I don't bother.

I think if I went with shorter length bars it would open up that hip angle but it would harder to get you back flat unless your handlebars are aggressively low to begin with. I think the flat back is most important compoenent of being aero so shorting things up would get my arm bend closer to 90 degrees at the expense of the flat back. So, not a good trade-off in my case. Hard to say if you would experience the same things so I think you just have to try different things and see what works for you. The nice thing about adjustables though, are they are adjustable. Once you get dialed in, then maybe you can go to fixed system since you'll know the parameters you're looking for. Good luck and let us know what works for you!