Here is my 2012 Cervelo R3 with older bars and D/A components.



Here is my 2012 Cervelo R5 with 2012 Ritchey bars and SRAM Red components.



Note the shape of the bars where the grifters attach. On the older bars the brifters mount lower and the bars have a slight curve at the top. The newer bars are flatter at the top. When I started riding the new bars, I would get some hand pain and had to futz around with the angle and put an extra layer of tape on the bar at the brifter - millimeters matter. Also, the actuation of the older D/A has a very light touch to shift and I would use my middle finger. The new SRAM was stiffer and the new bars featured internal routing cables in the bars. The tendon on my middle finger got sore and I now shift using my index finger and middle finger. I ride and shift a lot so subtle changes in position and movement affect me.

Here are a couple of pics from the top of Mount Hamilton on a training ride in preparation for our climb up Mount Ventoux. I had changed the stem from a 100 mm -6 to a 110 mm -17 stem.