The setup on my 1999 Lemond Alp duez is all Shimano 105 9 speed components. My shifters/brake levers are STI ST-5500, RD-5500 rear derailleur, FD-5500 front derailleur, 11-27 rear cassette and 53x39 front chain ring. I have a NIB 12 x 27 rear cassette. If I went with a compact double, what rear cassette would work with it, would I need a different front chain ring setup?
My old double setup,used,to ne all I needed most of the time but it is not enough for me anymore as I really struggle on alot of the hills around here now where I currently living.