I'm interested in this but concerned about backward compatability. I'm
currently using a 7 speed Shimano Hyperdrive system with 7 speed hubs,
cassette and chain. These parts are getting increasingly harder to source. I
was reluctate to upgrade to 8 speed because 9 was around to corner. Then it
was 10speed cassestte. Now it's 20 and that seems like enough. Will there be
any adapters to fit the new "20" onto my 7speed rear hub or must I replace
it along with everything else.


"Sheldon Brown" wrote in message
...
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/nanodrive

Sheldon "Progress!" Brown
+--------------------------------------------------------------+
| Warning: Objects in mirror appear smarter than they are. |
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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 http://sheldonbrown.com