The popularity of motorcycle brands can vary by region and over time.
Harley-Davidson has a strong and dedicated fan base, and many riders are loyal to the brand. However, the overall market share of Harley-Davidson motorcycles compared to other brands may vary depending on various factors such as market conditions, competition, and the popularity of different motorcycle segments.
To obtain the most up-to-date and accurate information on the current percentage of bikers who ride Harley-Davidson, I would recommend referring to industry reports, market research, or motorcycle sales statistics from reputable sources.