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On the Nomad Mk2, the two lower (dropout) eyelets are tapped for 5mm, but can be bridged with a stainless adapter providing a single 6mm mount and additional width for clearing a Hope disc brake caliper.
Nomad frames sold alone by SJS Cycles do not include these adapters, but they can be ordered separately. See: See:
http://www.sjscycles.co.uk/thorn-for-rohloff-cast-end-2-x-m5-to-1-x-m6-stainless-dropout-adaptors-prod11703/?geoc=us The adapters are listed as a "related product" on Nomad frame pages on the SJSC website.
Since the adapter uses both 5mm dropout eyelets, mudguard stays must attach to the rack. ...
... or you can use a pair of extra long M5 bolts (one each side) and attach your fender stay to the insides of the dropouts and then use a nylock nut.
This would not work well with most derailleur bikes, the bolt could be too close to the chain and might interfere, but not a problem on a Rohloff bike. See photo.
But, I do not use a disc, so I do not know if a bolt mounted this way might interfere with a disc.
I have since taken the adapters off my bike, so my rear rack is sitting on M5 bolts now. In the photo I have the Surly rear rack on my Nomad, that rack really does not like the lower mounts being spread that far apart, it actually pushed my dropouts closer together making it harder to drop my wheel into the frame. So, I removed the adapters so that my rack no longer pushes the dropouts together.
I noted above that I use a Tubus Logo EVO for most touring on the back but when I get home I put a rack on with a wider platform, that is why I have the Surly rack on it for around home use. On my Maah Daah Hey trip, I used a Racktime Addit rack, but that is another story.