Creating a detailed SVG image of a pelican riding a bicycle involves combining the elements of a pelican with a bicycle. Below is a simplified SVG code that attempts to represent this whimsical scene. Please note that the quality and realism of the image depend on the capabilities of the rendering environment (e.g., web browser, SVG viewer).

```svg
<svg xmlns="http://www.w3.org/1999/svg" width="400" height="200">
  <!-- Pelican Body -->
  <rect x="50" y="50" width="100" height="100" fill="#FFD3A3" stroke="#FFD300" stroke-width="4"/>
  <circle cx="75" cy="50" r="30" fill="#FFD300" stroke="#FFD300" stroke-width="4"/>
  <circle cx="100" cy="50" r="30" fill="#FFD300" stroke="#FFD300" stroke-width="4"/>
  <path d="M150,50 Q200,150 250,50" stroke="#FFD300" stroke-width="4" fill="none"/>

  <!-- Bicycle -->
  <circle cx="200" cy="50" r="20" fill="black"/>
  <circle cx="150" cy="80" r="10" fill="black"/>
  <circle cx="230" cy="80" r="10" fill="black"/>
  <ellipse cx="210" cy="110" rx="30" ry="20" fill="black"/>

  <!-- Bicycle Wheels -->
  <circle cx="190" cy="80" r="5" fill="black"/>
  <circle cx="230" cy="80" r="5" fill="black"/>

  <!-- Bicycle Handlebar -->
  <line x1="200" y1="120" x2="210" y2="150" stroke="black" stroke-width="4"/>

  <!-- Bicycle Seat -->
  <polygon points="210,90 230,120 220,120" fill="black" stroke="black" stroke-width="2"/>

  <!-- Pelican on Bicycle -->
  <g transform="translate(250, 50)">
    <circle r="30" fill="#FFD300"/>
    <line x1="0" y1="15" x2="0" y2="-15" stroke="#FFD300" stroke-width="4"/>
    <line x1="-15" y1="0" x2="15" y2="0" stroke="#FFD300" stroke-width="4"/>
  </g>
</svg>
```

This SVG code attempts to create a basic representation of a pelican with a bicycle. The pelican is depicted using a simple geometric shape, and the bicycle is constructed using circles, ellipses, and lines to form the basic structure. The pelican is positioned atop the bicycle, although the exact pose and details would need to be refined for a more realistic or specific depiction. 

Please keep in mind that the rendering of SVG images can vary across different viewers and browsers, and the visual quality might not fully capture the intended artistic vision due to the simplicity of the shapes and colors used.

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