Yellow Cleat: For anyone unsure about which cleats to choose, the SM-SH11 are a great starting point. With their large float range and centered pivot point, Shimano’s Yellow SPD-SL cleats allow the toes to point in a wide range of angles and provide more room for error during set-up while still delivering an efficient connection between rider and bike. So if you're new to cycling, experience knee pain, lack flexibility, or simply don’t know where to begin, these cleats are your best bet.
BLUE Cleat: For cyclists seeking maximum power transfer but also a minimal amount of float, Shimano’s SM-SH12 Blue cleats are the answer. By placing the pivot point at the front, lateral sliding movement is eliminated. But these cleats still permit a small amount of angle change from the pivot point back towards the heel so that your foot is not completely locked in place.