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Although you'd potentially void the warranty on your Rohloff as the ECR isn't listed as meeting their stiffness (or may not yet have been tested yet...)
http://www.gatescarbondrive.com/Manufacturers%20And%20Models
@peter_v there are some steel bikes you could probably tour on in that list as a starting point
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Although you'd potentially void the warranty on your Rohloff.
Oh I do know that, what I don't know is whether his friend want Rohloff in the first place.
@peter_v you gotta be talking about the disc version.
Belt drive and touring is not something I would combine.
It may be best to get a standard frames and get it modified for belt drive, like the Surly ECR;