I am using 10-speed Ultegra SL shifters from 2008 with a 7900 RD and 7900 chain. Are these systems fully compatible? I have been using this setup for over a year, so it obviously works, but shifting is never flawless. I have heard that the pull ratios might be slightly different between SL and 7900. I still have an SL FD because the pull ratio for the front is much different and requires it. My concern is the rear shifting.
Thanks a lot
Thanks a lot