What brand is it? Looks the business
Specialized FatBoy with XX1
A Specialized Fat Boy in size Large with a few modifications;
2X removed and installed Sram XX1 clutched derailleur and shifter with a 11-45 XT cassette,
Cannondale Si FatBike crankset, with pedals
Thomson seatpost with a seat.
The rest of the components are original spec’ from the FatBoy.
Tyres are Specialized Ground Control 26 x 4.6” which roll really well over soft and loose surfaces.