Originally Posted by Dry Mechanics

I hope that's the right forum to introduce new bicycle technology, a shifted tooth belt drive with derailleurs. All expert opinions found in the Wed are categoric - chain-style belt shifting with derailleurs is not possible. Patent search I made also hasn't revealed any known designs of shifted toothed belt drives.

Of course, I am aware of 2-speed cassette from Veer. However, I was motivated to make a multi-speed belt driven twin of the derailleur-shifted chain drive.