Originally Posted by
wgscott
Take a look at the Microshift Advent X 10-speed drivetrain. We are upgrading my kid's 12-speed to this. I think it is supposed to arrive tomorrow.
I have heard good things about that group; I have an older Microshift thumb shifter on my 9 speed city bike. It's connected to an inexpensive Deore derailleur; the whole thing was a snap to set up and shifts beautifully and runs very very quietly.