Is this a bug report or a feature request? The Wheels field in CVehicleModelInfoVarGlobal is explicitly defined as an AtArray of size 13. Moreover, GetVehicleWheelType returns 5, VWT_TUNER, because that is the default wheel type specified in CVehicleModelInfo as the provided wheel type is invalid, e.g.,

  v3 = *(a1 + 960);
  if ( v3 > 0xCu )
    result = *(*(a2 + 32) + 0x34Ci64); // VWT_TUNER

Or am I missing something here?