2005 Felt 70
Shimano 105 27-speed.
FSA Gossamer cold-forged alloy triple crankset.
I was considering changing to a flat bar. Or if possible adding rapid-fire shifters to the top bar. I have 5 or 6 stop lites in my 3 mile commute as well as a number of intersections I need to slow down at so I don't often get in the drops. Shifting on the hood is uncomfortable to me. My questions are other than possibly a new stem, bar and shifters would there be anything I would need? How do I know what components fit? I see a lot of 9-speed STi rapid-fires which I love and look great for commuting but my bike is 27-speed. Or is nine in reference to the rear cassette? Is there a chart of what is compatible with what?