Guys, please just humour me on this one, this 27 speed business is a bit much for me. What I really want is the same gear range but with fewer actual gears. All I really want is a 39/32 (or equivalent ratio) gear at the bottom, a 50/11 (or equivalent ratio at the top) and a few gears in between. I don't want the hassel of all this using the cassete "in concert with the appropriate chainrings". Is there a simple, mechanically robust, economically viable solution along these lines?