... The motorcycle crowd (Harley BMW etc) ...
Harley belts are a whole Lot Wider,
BMW were never belt drive, still not, they use a drive shaft. [owned one]
FWIW,
Rohloff is a 2 cable Pull-Pull grip shift, all the gear sequencing is in the hub
if a cable breaks an 8mm wrench will shift the gears , back on the hub
another German company Mittelmeyer makes a different shifter for the speed hub
bigger ID so as to slip around drop bar curves, and a eccentrically machined piece
to clamp around, it has a gap for the brake cable to pass inside the grip shifter.