This is a heavy duty pneumatic rear wheel assembly for the Rascal 235, 245, 305, and 600 series of electric mobility scooters. The size of the wheel assembly is 3.00-4, alternatively listed as 10"x3" or 260X85. This is the "old style" wheel assembly.
In addition to the 235 and 245 heavy duty scooters, the 600 series includes the Rascal 600B, 600F, and 600T models.