This video show you how you can use an accurate calculator for free online to calculate the right spring for your motorcycle (almost any) where you not only put in your weight but also your riding type, street, canyon carving, Adventure, touring, racing or stunt riding. Plus you insert your preferred tire type, your skill level and mor é and you get a spring that is a great setup for you in particular.
I made this video because I seen a lot of sales websites recommending a spring rate only for weight, then later in forums you can see people are not happy, they thing everything stock is crap and buy all new suspension for thousand dollars and much more. Some also go back to stock as it was better than this.
We look into this on the setup and you can see the sales sites quoted completely wrong setup for me, and likely you. After this you can make an educated purchase of springs for your motorcycle, that fits you, your bike, your riding and your skill level.