Oddjob
Merry fucking Xmas to you assholes
That's really great feedback, thanks. How on earth did you get a GPI before superfan @Zaf?As someone who has bikes with Di2 (road and mtb), standard cable derailleur gear, a Rohloff hub bike and a Pinion equipped Nicolai I think I can answer some of these questions.
1. The weight penalty is noticeable towards the end of a longer ride. Changing tyres to something with less rolling resistance could make enough of a difference to offset this somewhat. On the plus side it does make you a stronger rider.
2. I can only go by feel here. The Rohloff definitely has the greatest internal resistance. Between my singlespeed, derailleur euqipped mtbs and the Pinion I can't feel any difference in efficiency. The Pinion gains some over a derailleur set up if the chainline is straight.
3. It's juts like soft pedalling when you change gears with a derailleur but a bit more pronounced. You are the clutch, so letting a bit of load off the pedals lets you shift to an easier gear. You don't have to soft pedal to change to an easier gear. With the Rohloff you have to release the pedalling load for changes in both directions.
4. I don't have any issues going between all three systems. I still know how to use a front derailleur though.
If anyone (hint hint) is willing to let me touch their gearbox bike I'm happy to be converted. Although I think I will hold out for a couple of generations of weight loss and a Di2 or more elegant trigger shifting system.
@Zaf, a 10s XT cassette is only going to add 200g tops to the inertia of the rear wheel. That inertia is stored energy, so it's not quite the same as energy loss through friction etc.
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