Part number: LOS43059 Losi 43059 BFG KM3 Fr/Rr 2.2/3.0 Prmntd 12mm 2 : RZR Rey. Specifically, it's a BFG KM3, Front, Rear 2.2/3.0 Premounted, 12mm (2): RZR Rey. Part: BFG KM3, Front, Rear 2.2/3.0 Premounted, 12mm (2): RZR Rey.
eBay