Creating a detailed SVG image of a pelican riding a bicycle involves several steps, including designing the pelican, the bicycle, and then combining them in a way that looks plausible. SVG (Scalable Vector Graphics) is a vector image format that uses XML to define shapes, images, and animations. Below is a simplified version of what such an SVG might look like. Note that this is a basic representation and might not capture all the intricacies of a real pelican riding a bicycle due to the complexity and the nature of vector graphics.

```svg
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 200">
  <!-- Pelican -->
  <path fill="#8B4513" stroke="black" stroke-width="2" d="M50,80 Q100,120 150,80"/>
  <circle cx="75" cy="70" r="10" fill="white"/>
  <path fill="white" d="M70,85 Q75,95 80,85"/>
  <path fill="white" d="M90,85 Q85,95 80,85"/>
  
  <!-- Bicycle -->
  <path fill="none" stroke="black" stroke-width="2" d="M80,20 Q120,20 160,80 Q180,120 140,120"/>
  <circle cx="120" cy="80" r="10" fill="black"/>
  <circle cx="160" cy="80" r="10" fill="black"/>
  
  <!-- Combined -->
  <!-- Adjustments needed for pelican on bicycle -->
  <!-- This is a placeholder for the pelican's position on the bicycle. You would need to adjust the paths or add additional paths to position the pelican realistically on the bicycle. -->
</svg>
```

This SVG code provides a basic structure for a pelican and a bicycle. However, to realistically depict a pelican riding a bicycle, you would need to:

1. **Adjust the Pelican Shape**: The current pelican shape is very basic. You might want to use more detailed paths to represent the pelican's body, wings, and beak.
2. **Bicycle Details**: Similarly, the bicycle is represented very simply. Adding details like the handlebars, seat, and wheels would make it look more realistic.
3. **Positioning the Pelican on the Bicycle**: This is the most challenging part. You would need to carefully design paths that represent the pelican's body and feet positioned on the bicycle's frame, seat, and handlebars. This might involve creating additional paths and using transformations (like `transform="translate(x,y)"`) to position the pelican correctly.

Creating a detailed and realistic image like this would likely require a more complex SVG with numerous paths and possibly the use of gradients or patterns for shading and texture. For a high-quality depiction, you might also consider using a graphic design tool that supports SVG export, allowing for more precise control over shapes, colors, and details.

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