Theoretically speaking, what would happen if you ran a pinion gearbox and a rohloff on the same bike...?
https://youtu.be/e-ig-R65yHg
You'd void the warranty on the Rohloff.
You'd get access to gear ratios that are way beyond the hub's design limits. It would probably eat itself under heavy load in the lowest ratios.
@Velodouche started
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Theoretically speaking, what would happen if you ran a pinion gearbox and a rohloff on the same bike...?