What is the best BMX ratio?

Could you please elaborate on what you mean by the "best BMX ratio"? Are you referring to a specific aspect of BMX biking, such as gearing, wheel size, or frame geometry? Or are you asking about a financial ratio related to a company or investment that operates in the BMX industry? Without more context, it's difficult to provide a definitive answer. However, in general, the "best" ratio can depend on a variety of factors, including personal preferences, riding style, and intended use. For example, a taller rider may prefer a different gear ratio than a shorter rider, and a BMX bike designed for racing may have a different wheel size and frame geometry than one designed for freestyle tricks.