Hello, I'd like to change from an Ultegra 12/27 to an Ultegra 11/28. My current Ultegra 6600 RD and 12/27 shifts extremely well and hope to have the same smooth shifting with the 11/28.
The Shimano website says that I need to upgrade to a 6700 RD to accommodate the 11/28 but I've heard that the 6600 RDs work. If I upgrade to the 6700 RD will that substantially improve shifting?
Will I my 6600 brifters work with a 6700 RD?