Yamaha Gear Ratio Calculations

I've been experimenting with gear ratios on my Yamaha motorcycle and I'm trying to understand how to calculate the ideal gearing for different types of riding. I've read some online resources that explain the basic principles, but I'd love to get a better understanding of how to apply this knowledge to my specific bike. Specifically, I'm looking at how to determine the optimal gear ratio based on factors like power output, engine speed, and road conditions. Does anyone have experience with Yamaha gear ratio calculations or can offer any advice?