Another piece of info on the Efneo... They told me that the current shifter is a rapidfire type for 22.2mm bars, but that they plan to offer a gripshift type that may be available for 23.8mm bars. They are looking for input from potential customers. The weight is stated to be an additional 500 grams over what a "typical" triple crank with alloy chainrings and front derailleur would be. Considering it's in the center of the bike, that sounds reasonably light.