As stated above, check the tightness of the pedals first. If you have deteremined that it is at its lowest setting, check the type of cleat you are using. The SM-S51 cleats is a single release mode cleat, wherein, you can only clip out by twisting your ankle outward. The SM-SH52 and SH55/56 is multi-position release and you can clip out by twisting your ankle in any direction.