The Shimano SH51 SPD Cleats are a type of cleat that attaches to the sole of compatible cycling shoes and is designed for use with Shimano's SPD (Shimano Pedaling Dynamics) clipless pedal system. The SH51 cleats are known for their reliability and durability, making them a popular choice among mountain bikers and other off-road cyclists.

The SH51 cleats have a single release mode, which requires the rider to twist their heel outward to disengage from the pedal. This can provide a secure and predictable release, which can be particularly helpful when navigating technical terrain or in other high-stress situations.

The SH51 cleats are made from a durable and long-lasting steel construction, which can withstand the demands of off-road cycling. The cleats are also designed to shed dirt and debris, which can help to maintain a smooth and reliable connection to the pedal.