JRi Harley Davidson shocks are available in single adjustable and non adjustable options in three different lengths, 11" 12" and 13" with a variety of spring combinations.
Our 12" stock is the most common starting place and would be the closest direct OEM replacement. Our "standard" replacement setup as a starting point would be the 12" shock with a 23nm spring.
From that point, you can increase or decrease your spring rate to better suite your own weight and riding style. Keep in mind not only your weight but the weight of your passenger and the frequency with which you ride 2-up.
We will continue supplying more product info but if anyone has any questions please do not hesitate to ask. For vehicle specific info you can view our application chart HERE
that offers great length and spring recommendations based on your machine and riding type.