Replace the cleat and the base plate if you feel rocking or vertical play.
However, all cleats wear and the junction should feel pretty snug even if the rest of the cleat looks fine. Speedplay X series pedals with round springs are more prone to rock inducing flat sections wearing into the springs than the square springs found on Speedplay’s Light Action and Zero series. In addition to visual inspection of the springs, you can check this by engaging the shoe on the pedal and then removing your foot (leaving the shoe attached to the pedal) and then grabbing the heel and the toe of the shoe and twisting it from the medial to lateral aspect (big toe to small). Metal cleats, like those found on Speedplay, may appear fine, but the springs and/or base plate may be flattening or developing grooves that allow the foot to rock on the pedal. It is important that you replace your cleat frequently enough that the wear does not encourage the foot (and thus joints like the knee further up the kinetic chain) to start rocking laterally during pedal loads. You can also look at the pedal body where the cleat contacts to see if you have developed a wear pattern between the cleat and pedal that could allow your foot to rock as well. Whether a cleat has a wear indicator or not, if the cleat is under half its original thickness, it should be replaced. Many pedals that use plastic cleats (Look, Shimano SPD-SL…) have wear indicator (usually a colored area or small hole on the bottom) that disappears as the cleat wears. Having cleats and pedals that are in good condition not only helps you get the most out of your drivetrain, it can also help you avoid injury. My Speedplay cleats look okay, but is there a time/mileage when I should replace them?
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