I received the following email from an inventor in Switzerland who is working on CV transmission for bikes. This would do away with front and rear mechs and the gearing would all be built into the single chainring which would “change size” at the push of a button. Sounds interesting, but I wonder if it will ever come to market. Anyway, here’s his email, there’s a link to survey that he’d like you to complete if you have the time. Thanks.
Steve