Hi,
My bike is a Di2 Ultegra mid cage with chainrings 52/36 and actual cassette 11-32. I am 70 years old and I have gone through a severe heart operation. Despite of that I have my routine is to bike 30-35 kilometers in fast pace almost daily. In this manner I have succeeded to gain puls at 51-52 b/m . Recently I feel that I need little more help from bigger sprockets such as
11-36 and or 11-40, and I wonder which to choose.
I appreciate any help and advise in this respect.