The Iconic Shimano SPD Sandal The Shimano SH-SD501 Cycling Sandal is legendary in the global cycling community and continues to be an international bestseller year after year. It's no surprise that the SH-SD501 SPD Sandal is the longest-running, fundamentally unchanged product in Shimano's lineup. This is no doubt due to the fact that it's an extremely comfortable choice for casual riding in warm weather while still allowing the rider to maintain optimal pedaling efficiency.