I am about to put together a bike using shimano 9 sp triple set up and I have a extra dura ace short cage RD. Will it work with a 12-25 cassette I'll be using, If not how can I make it work 11-23 cassette??? Or do I really have to use a long cage RD. I guess by reading other post If I want to convert my drivetrain to 10 speed all I need is the shifter and the cassette?? Thanks!!!