epicyclo did the measurements of the 4″ tyres on different rim widths,
Been swaying on adding a fat rim 26″ wheelset to the collection for my KM too,making it ridable on the beach for friends or may just get the 50mm Speedway cycles rims and run the 2.55 WTBs for a bit more float,
Think i mentioned it already but the Vredestein Black Panther 3.0 tyres are big fat xc tyres and really light- but not sold here in the UK, maybe could get them sent from Germany or Holland? 😮
Sell what you can and indulge in some full fat 4″ F&R