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@Smallfurry
Just how fat do you intend to go?
On-one seem to thnk 4" tyres, and 70mm rims are the way to go for UK mud. I'm inclined to trust them on this.
Some Marge light rims, and some 45NRTH mud tyres would be a sweet set-up, light, grippy, and they'd only be 92mm or so wide. So a flat 49mm chainline would barely brush the tyre. Thats only 2.5mm more than shimano MTB standard. So a outer mounted chainring, and a spacer at the sprocket would get you there. With decent chainline to boot. I've spaced my NuVinci hub out 1-2mm. Not sure if its also doable on the Alfine.
A lot of 29ers are looking to the new Krampus tyres from surly. But the height of the tyre + wheel simply wont fit in a standard 29er frame. Personnally I would'nt want to lengthen stays for it.