QB has developed a Shaft Stiffness Index. The number is determined by the distance inches at which the shaft bends 1/2" under a 165 lbs load. So the stiffer the shaft the higher the SSI number.
The general rule is that the bigger you are, in both weight and height the higher SSI type shaft we recommend. All paddles come standard with the SSI shaft that matches the selected blade size. For some paddles (Kanaha AC) you can request a non-standard SSI. All options are available in the dropdown selection box.
These are recommended paddles SSI's by paddler height, weight and blade size. They are considered good choices for the majority of paddlers. Your personal preference, physical attributes or intended usage may require a choice different from the above recommendations.