I currently have a Trek 2100 -- traditional geometry bike. I'm considering getting a Trek Pilot 5.0 -- "comfort" geometry bike. Technically, I assume it will make me slower, since the position is more upright. But can anyone comment who has ridden both types extensively, if their average speed was significantly impacted? I don't race, but do like riding fast (for me). I often average 19 MPH. Can I still expect to average that? Any comments or insights would be appreciated.