[Flieger]

A freewheel works alright on a bicycle but what about compression braking? It seems it would be like a slipper clutch on a motorcycle. And not to mention the heat and friciton of a freewheel running continuously, as if you were on the track.

What about the new Lamborghini (Audi) dual-shift rod system? It is supposed to be used on the Jota, I think, and maybe that carbon concept car. It basically uses more shift rods so that you can be disengaging second while engaging third, even though their sliders/synchros are separate.

F1 cars do something similar to this, but they do not have a rachet/freewheel. They just use electronics. It is scary to hear a gearbox engineer talk about them, because they say that VERY briefly, two gears are engaged at the same time. Not sure if this is a red herring or if it is literally true and there is just wind-up in the shaft between the two gears.