I am planning on the following gearing:
I could use either an Ultegra GS or XT long cage Derailleur.
Currently our lowest gear is 30/30 (9 speed) and we do use it.
I may end up changing the front chain ring from 30 to a 28.
In that case I will be exceeding the 22T differential for both derailleurs.
I have read this is ok as long as you only use the top few cogs on the rear.
Will the Ultegra GS shift better? Do XT derailleurs work well with 10 speed?