Here's why:
* Instructional Focus: The title implies a practical guide on learning to ride a bicycle. Nonfiction books often provide factual information, instructions, and advice on specific topics.
* Common Genre: "How-to" books are a common genre within nonfiction.
* Lack of Narrative: While a fictional story could be written about learning to ride a bike, the title itself doesn't suggest a fictional narrative.
However, there's a slight chance it could be fiction depending on the specific book. For example, there might be a fictional novel with the same title that tells a story about a character learning to ride a bike, but it would be a fictionalized account rather than a straightforward instructional guide.
To be sure, you'd need to know the specific book you're referring to.