For off road riding, full coverage mudguards are dangerous and impractical.

For commuting and pavement riding (even if there's snow), mudguards that aren't full coverage will get you all dirty and sprayed - both the bike and the rider.


My point - if original fat tyres are used for off-road, I'd strongly suggest taking the mudguards off. If no off road, then a change for a bit thinner, slick tyres is a good choice.