Re: Electronic Shifting & Disk Brakes &...
I built up my second CA2 with SRAM eTap in the spring of 2018. Had some initial problems with the rear derailleur but SRAM replaced it. After thousands of miles in the summer of 2018 it was working great. But sometime in August I developed pain in my right elbow. It kept getting worse and finally was diagnosed as tennis elbow in September. I also finally realized the pain was bad every time I got off my CA2. It turns out that all the shifting I was doing with my trigger finger, with arms mostly extended on the CA2, irritates the tendon that goes from my hand to elbow. By the time I realized this the pain was so bad I could barely brush my teeth. I started riding my backup CA2 with bar end shifters more often to reduce the tendon irritation. And also resting my right arm in my lap while riding as much as possible. Tennis elbow is nasty and it has taken most of a year to get rid of the pain.
One other drawback to eTap is the long cage rear derailleur has no type 2/3 clutch to control chain bounce like the MTB derailleur. On our rough Michigan roads I have had the chain jump off the front chainring several times. That is never a problem with my other CA2 and the SRAM XO type 2 rear derailleur.
A couple of other advantages with bar end shifting is
1. knowing what gear you are in by the position of the shifters, and
2. being able to rapidly shift a lot of gears, like when coming to a sudden stop.
If I had to do it all over again I would probably go with bar end shifters and MTB type 2 or 3 rear derailleur like my backup CA2 has.
But I do like the SRAM Red 50/34 crankset and would keep that.
Carbon Aero 2