No. What ever tire your going to run leave them on or your old tires. Jack up your buggy until the shock is at maximum travel with the tires still on the ground, measure ground clearance, load buggy with simulated weight that you ride with, set it back down, roll back and forth a few feet, then measure ground clearance again. You will be close to optimum by setting spring preload at 1.5 inches spring sag. It's not perfect but it beats a shot in the dark.