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The ideal amount a shock should collapse at ride height is contingent upon the total travel of the shock used and its intended application. For example, let's presume you're running shocks with 4 inches of travel in a street/strip setup (40/60) where more rebound is desirable. In this case, biasing 60 percent of the total shock travel involves collapsing the shock 2.4 inches at ride height. This results in 60 percent of travel (2.4 inches) reserved for rebound and 40 percent (1.6 inches) of travel reserved for compression. Consequently, 2.4 should be used as the "T" value in the spring rate formula.