Thanks, Sheldon - I guess what I'll do is this:
1) Get the proper size band clamp for my FD (The Trek hybrids have a fairly think aluminum post - would I go for the 34.9?)
2) Take the old shifters, wheels, chain, RD and FD off
3) Install the new shifters, RD, FD, chain and new rear wheel/cassette
4) See if I have any problems in shifting
5) If so, swap out the 52T for a 50T outer chainring (will the 105 50T 5600 chainring fit the 5503 crankset?)
6) If that doesn't work, take it to a real mechanic who'll bail me out of the mess I've created.....
