On all of our REVO-ARC shocks for FL Touring the "Legend 90" is the Light-Duty Spring, "Legend 110" is the Standard-Duty Spring and "Legend 130" is the Heavy-Duty Spring. 

NOTE: Heavy Duty applications are recommended for 500 LBS. or more of rider and passenger total weight.

Note: Light Duty application is recommended for Solo Riders weighing less than 200 lbs.