Originally Posted by
tuckervill
Can you just change the shifters to brifters without changing the derailer and all that?
It'll be a pain in the neck!
If you swap shifters, you'll need a cassette to match in back (either the same number of cogs on the Trek 1000, or a cassette with the same spacing between cogs). Also, you'll likely need the 'light action' derailleurs on the Trek, which have less stiff springs and a floating upper jockey wheel, which all help with the indexing.
You could swap everything over, including the wheels. You might need a spacer for the front derailleur clamp, and stops on the downtube for the shifter housing, but otherwise, I think you could do it. Oh, and if the chainstays on your Centurion are longer, you may need to lengthen your chain.