Of course, that's not what I implied.. even Florian Schlumpf will admit that the High Speed drive,in overdrive, is not as efficient as a derailleur set up .. that has always been the knock on that particular hub with the 'bent crowd.. it's a nice piece, but if you are concerned with going fast, it'll take more effort to go the same speed when in 2.5:1 overdrive, than a conventional derailleur drivetrain.. I've installed and run all three .. High Speed, Speed Drive, and Mountain Drive ..