Are you still riding on old-fashioned half-inch-pitch chain and sprocket, like they used to use in the last century? No wonder you're slow! Time to get with it!
Unless you're a reactionary troglodyte retrogrouch, you NEED Nanodrive, the first 21st century drive train system! Get rid of that obsolete junk!
See: http://sheldonbrown.com/
Sheldon "Progress!" Brown
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Harris Cyclery, West Newton, Massachusetts
Phone 617-244-9772 FAX 617-244-1041
http://harriscyclery.com
Hard-to-find parts shipped Worldwide
http://captainbike.com
Useful articles about bicycles and cycling
http://sheldonbrown.com